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Body Control Modules Cadillac Seville V

Communication Devices 27 illustrations ~27879 words

DESCRIPTION & OPERATION

WARNINGVehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article.

BODY CONTROL SYSTEM

Vehicle is equipped with 3 control modules which make up body control system. These modules include: Dash Integration Module (DIM), Instrument Panel Module (IPM) and Rear Integration Module (RIM). Each module integrates input and output controls for many functional areas. Inputs and outputs are wired to closest module to minimize length and amount of wiring used. All 3 modules communicate on class 2 serial data circuit, allowing data to be shared among them, as well as with other class 2 modules on vehicle as needed.

CLASS 2 SERIAL DATA LINE

On vehicles that have several control modules connected by serial data circuits, one module is Power Mode Master (PMM). On Seville, PMM is Dash Integration Module (DIM). DIM receives 4 signals from ignition switch. To determine correct power mode, DIM uses these following circuits: accessory, crank, Ignition 1 and OFF/RUN/START voltages. Modules that depend exclusively on serial data messages for power modes stay in a state dictated by last valid DIM message until they can check for engine run flag status on serial data circuits. If DIM fails, modules monitor serial data circuit for engine run flag serial data. If an engine run flag serial data is true, indicating that engine is running, modules fail-safe to RUN. In this state modules and their subsystems can support all operator requirements. If engine run flag serial data is false, indicating that engine is not running, modules fail-safe to OFF-AWAKE. In this state modules are constantly checking for a change status message on serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle. Modules communicating along class 2 serial data line are as follows

  1. Cellular Telephone Module
  2. Continuously Variable Road Sensing Suspension (CVRSS) Module
  3. Dash Integration Module (DIM)
  4. Driver's Door Module (DDM)
  5. Electronic Brake Control Module (EBCM)
  6. Instrument Panel Module (IPM)
  7. Instrument Panel Cluster (IPC)
  8. Memory Seat Module (MSM)
  9. Navigation Data Processor
  10. Navigation Display Module
  11. Powertrain Control Module (PCM)
  12. Radio
  13. Rear Integration Module (RIM)
  14. Remote Keyless Entry (RKE)
  15. Sensing & Diagnostic Module (SDM)
  16. Steering Column Module
  17. Theft Deterrent Module
  18. Vehicle Interface Unit (VIU)

When ignition is turned to RUN position, each module communicating on class 2 serial data line sends a State Of Health (SOH) message every 2 seconds to ensure that a module is operating properly. When a module stops communicating, for example if module loses power or ground, SOH message normally sent on data line every 2 seconds disappears. Other modules on class 2 serial data line which expect to receive that SOH message, detect its absence and in turn set an internal DTC associated with loss of SOH of a non-communicating module. A DTC is unique to a module which is not communicating.

For example, when DIM SOH message disappears, several modules will store DTC U1064 Loss Of Communication With DIM. Loss of serial data DTCs do not normally represent a failure of module that store DTC. Use this technique to quickly identify which module is not communicating on class 2 serial data line.

DASH INTEGRATION MODULE

Dash Integration Module (DIM) is wired to class 2 serial data circuit. DIM functions include the following: control of exterior lights, hood ajar switch input, horn relay control for theft activation, interior lights and incandescent dimming, low side temperature for Heating Ventilation Air Conditioning (HVAC) compressor, power moding control over class 2 serial data circuit, steering wheel controls, storage of clock settings and sending a message out on class 2 serial data circuit in response to requests form other modules.

INSTRUMENT PANEL MODULE

Instrument Panel Module (IPM) functions include front Heating Ventilation Air Conditioning (HVAC) air delivery, HVAC temperature controls, ambient light sensor input, headlight twilight delay input, foglight switch input, instrument panel dimmer switch input, traction control switch input, interior lights switch input, key-in-ignition input, fuel door release switch input, trunk lid release switch input and ignition switch headlight control.

REAR INTEGRATION MODULE

Rear Integration Module (RIM) functions include fuel level sensor input, heated seat controls, Heating Ventilation Air Conditioning (HVAC) blower control, rear defogger control, parking brake relay controls, interior lights control, back-up light controls, automatic day/night mirror controls, rear foglights controls, fuel door/trunk lid release controls, Retained Accessory Power (RAP) control for sun roof module, door ajar switch inputs, tamper switch inputs from trunk lid, and anti-theft alarm controls.

COMPONENT LOCATIONS

Note. For component locations, refer to illustrations. (Scheme 1)- (Scheme 12).

ComponentLocation
BatteryBelow Passenger's Side Rear Seat
Cellular Telephone ModuleBehind Rear Shelf Trim, Mounted To Right Side Of Rear Shelf Carrier
Continuously Variable Road Sensing Suspension ModuleBehind Right Rear Seat
Cruise Control ModuleRear Engine Compartment, Near Brake Booster
Dash Integration ModuleBehind Right Side Of Dash, Near Blower Motor
Data Link ConnectorBelow Left Side Of Instrument Panel, Near Steering Column
Driver's Door ModuleIn Driver's Door, Near Radio Speaker
Electronic Brake Control ModuleLeft Front Of Engine Compartment Attached To Subframe
Instrument Panel ModuleBehind Center Of Dash, Part Of Climate Control Panel
Memory Seat ModuleBelow Driver's Front Seat
Powertrain Control ModuleLeft Front Corner Of Engine Compartment, Below Air Cleaner Housing
Rear Integration ModuleBehind Rear Seat Back
Rear Fuse BlockBelow Rear Seat
Remote Keyless Entry ModuleCenter Of Rear Compartment, Under Package Shelf
Sensing & Diagnostic ModuleBelow Passenger's Front Seat
Steering Column Tilt/Telescoping ModuleLeft Of Steering Column
Theft Deterrent ModuleLeft Side Of Instrument Panel, To Right Of Steering Column
Underhood Fuse BlockOn Right Side Of Engine Compartment, Near Power Steering Pump
Vehicle Communication UnitRear Of Passenger Compartment, Behind Rear Seat Back, Mounted To Vehicle Interface Unit
Vehicle Interface UnitRear Of Passenger Compartment, Behind Rear Seat Back, Mounted To Electronics Bay

COMPONENT LOCATIONS

Scheme 1

Scheme 1
Scheme 1

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Locating Remote Control Door Lock Receiver. Scheme 8

Scheme 8: Locating Remote Control Door Lock Receiver
Scheme 8: Locating Remote Control Door Lock Receiver

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12

PROGRAMMING

Note. Use of Tech 2 scan tool is recommended. A generic scan tool may be used, but may have limited capabilities.

CONTINUOUSLY VARIABLE ROAD SENSING SUSPENSION MODULE CALIBRATION

Note. DTC C0563 is stored in memory of new Continuously Variable Road Sensing Suspension (CVRSS) module, and will not clear until CVRSS is calibrated. Scan tool must have latest version chassis application program to calibrate CVRSS module.

Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. Follow manufacturer's instruction.

Air bag indicator light may remain on after replacement and during programming procedure for Dash Integration Module (DIM). After programming procedure is completed and ignition key is cycled from OFF and RUN positions, air bag indicator will turn off.

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, select DIM, then SPECIAL FUNCTIONS. Under special functions, select NEW VIN (to continue with procedure) or EXIT to go back to special functions.
  2. After NEW VIN is selected, follow scan tool instructions to edit Vehicle Identification Number (VIN). Press SAVE to save VIN information. Then press DONE to go back to special functions.
  3. Under special functions, select SETUP SDM SERIAL NUMBER IN DIM (to continue with procedure) or EXIT to go back to special functions.
  4. Scan tool will display DO YOU WANT TO SET UP A DASH INTEGRATION MODULE? If YES is selected, scan tool will display INITIALIZING NEW MODULE. If NO is selected, scan tool will return to special functions.
  5. Once set up is complete, scan tool will display MODULE INITIALIZED. To complete procedure, select EXIT and go to SPECIAL FUNCTIONS menu. Under special functions, select SET OPTIONS (to continue with procedure) or EXIT to go back to special functions.
  6. Under SET OPTIONS, select POINT OF SALE, MISCELLANEOUS OPTIONS #1, MISCELLANEOUS OPTIONS #2 or PERSONALIZATION OPTION (to continue with procedure) and follow scan tool instructions. Press EXIT to go back to special functions.
  7. Reset owner's desired memory settings (seats, mirrors, radio, A/C). Cycle ignition switch to OFF and RUN positions.

POWERTRAIN CONTROL MODULE

After replacing Powertrain Control Module (PCM) or if program needs to be updated, refer to latest Techline information on PCM reprogramming. PCM can only be programmed using Tech 2 and Techline terminal, or by using a personal computer equipped with current service programming system software installed. After reprogramming, perform INSPECTION/MAINTENANCE PROCEDURES, CRANKSHAFT POSITION SENSOR SYSTEM VARIATION LEARN PROCEDURE, OIL LIFE INDEX RESET, IDLE LEARN PROCEDURE. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Program theft deterrent module. See THEFT DETERRENT MODULE under PROGRAMMING.

After replacement, reset owner's desired memory settings (seats, mirrors, radio, A/C), or perform the following procedure to recalibrate automatic level control

  1. Ensure scan tool has been updated with latest software version.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3)
  3. Turn ignition switch to RUN position.
  4. Under chassis main menu, select Rear Integration Module (RIM).
  5. Under RIM main menu, select RECALIBRATION.
  6. Follow scan tool instructions to recalibrate automatic level control.

REMOTE KEYLESS ENTRY TRANSMITTER

Note. All transmitters which are to be recognized by Remote Control Door Lock Receiver (RCDLR) must be programmed in a single programming sequence. If system is placed in program mode, all previously programmed transmitters will be erased upon receipt of programming signal from first transmitter. Up to 4 transmitters may be programmed.

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3)
  2. Turn ignition switch to RUN position.
  3. Using scan tool, select REMOTE FUNCTION ACTUATION special function. Program transmitters in order to place RCDLR into program mode. Doors will lock and unlock to confirm program mode.
  4. Press and hold LOCK and UNLOCK buttons simultaneously on first transmitter. After a 15 second delay, doors will lock and unlock to confirm programming of transmitter.
  5. Repeat previous step to program up to 4 transmitters.
  6. Remove scan tool.
  7. Operate transmitter functions to verify system operation.

STEERING COLUMN CONTROL MODULE

After replacement of steering column control module, it is necessary to program tilt/telescoping soft stops. Each soft stop is a programmable end of travel that is set approximately 0.5 inch (1.3 cm) from mechanical end of travel. Steering column has a soft stop set at each end of tilt up/down movement and at each end of telescoping in/out movement. This system uses soft stops to prevent wear on system by ensuring that steering column movement stops before it reaches its mechanical end of travel in any direction. Soft stops are initially programmed at factory. Stop positions may be reprogrammed, which is necessary any time steering column tilt/telescoping module is replaced, as described in the following procedure.

  1. Turn ignition switch to RUN position.
  2. To set tilt up soft stop, press tilt/telescoping COLUMN UP switch at least 8 times or until column moves, then release switch.
  3. Press tilt/telescoping COLUMN UP switch and hold until column travels all the way up, and continue to hold switch about a second after motion stops at mechanical end of travel. Soft stop for column up position is now set. Tilt/telescoping module will automatically go back to normal mode of operation.
  4. Repeat steps 2 and 3 , using COLUMN DOWN switch, to set column down position soft stop.
  5. Repeat steps 2 and 3 , using COLUMN IN switch, to set column out position soft stop.
  6. Repeat steps 2 and 3 , using COLUMN OUT switch, to set column in position soft stop.

THEFT DETERRENT MODULE

Note. When replacing a theft deterrent control module with an GM Service Parts Operation (SPO) replacement part, set up control module prior to a 10-minute relearn procedure or a 30-minute relearn procedure.

Set Up Procedure

CAUTIONWhen replacing a theft deterrent control module with an GM SPO Replacement Part, module will learn keys immediately. Existing Powertrain Control Module (PCM) must learn new fuel continue password when you replace theft deterrent control module. When replacing a PCM with a GM SPO Replacement Part, new PCM will learn incoming fuel continue password immediately after programming and upon receipt of a password message. Once a password message is received and a password is learned, perform learn procedure to change this password again. A PCM which had been installed in another vehicle will have learned fuel continue password of another vehicle's theft deterrent control module. Perform either 10-minute relearn procedure or 30-minute relearn procedure after programming to learn fuel continue password of current vehicle's theft deterrent control modules. When performing either relearn procedure, all previously learned keys will be erased from theft deterrent control module's memory. Additional keys may be learned immediately after first relearn procedure by inserting an additional key and turning ignition switch to RUN position within 10 seconds of removing a previously learned key. Use only a master key when performing first relearn procedure. If you use a valet key first, theft deterrent control module will not allow additional keys to be learned.
  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3)
  2. Turn ignition switch to RUN position.
  3. Using scan tool, select SETUP NEW VTD MODULE in Vehicle Theft Deterrent (VTD) special functions data list.
  4. Follow scan tool instructions.

10-Minute Relearn Procedure

Note. Use this procedure after replacing Passkey(R) III ignition keys, theft deterrent control module or Powertrain Control Module (PCM).

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3)
  2. Turn ignition switch to RUN position.
  3. Ensure all power consuming devices are turned off.
  4. Using scan tool, select REQUEST INFO under service programming system, follow scan tool instructions.
  5. Disconnect scan tool from vehicle, and connect scan tool to a Techline terminal with latest service programming system software.
  6. Using Techline terminal, select SERVICE PROGRAMMING SYSTEM, and follow Techline terminal instructions.
  7. Disconnect scan tool from Techline terminal, and connect to DLC.
  8. Using master Passkey(R) III ignition key, turn ignition switch to RUN position.
  9. Using scan tool, select PROGRAM ECU under service programming system.
  10. Ensure scan tool stays connected to vehicle for 10 minutes.
  11. Observe scan tool after 10 minutes. Scan tool will display PROGRAMMING SUCCESSFUL, TURN OFF IGNITION. Vehicle is now ready to relearn key information and/or passwords on next ignition switch cycle from OFF to RUN positions.
  12. Turn ignition switch to OFF position, and wait 5 seconds.
  13. Using master Passkey(R) III ignition key, start vehicle. Theft deterrent control module has now learned key transponder information, and PCM has now learned fuel continue password.

30-Minute Relearn Procedure

Note. Use this procedure after replacing Passkey(R) III ignition keys, theft deterrent control module, or Powertrain Control Module (PCM). Using Black master Passkey(R) III ignition key, turn ignition switch to RUN position. Observe SECURITY indicator. After 10 minutes, SECURITY indicator should turn off. Turn ignition switch to OFF position, and wait 5 seconds. Repeat steps 1 - 3 2 more times for a total of 3 cycles, or 30 minutes. NOTE: Vehicle learns key transponder information and/or passwords when ignition switch is cycled from OFF to START. Ignition switch must be turned to OFF position before attempting to start vehicle. Using Black master Passkey(R) III ignition key, start vehicle. Vehicle has now learned key transponder information, and PCM has learned fuel continue password. Using scan tool, clear any DTCs.

TIRE PRESSURE MONITORING SENSOR

Tire pressure monitor (TPM) system interfaces with Instrument Panel Cluster (IPC) through serial data line. Once program mode is accessed through Remote Control Door Lock Receiver (RCDLR), each sensor's unique identification code can be programmed into RCDLR memory. Each sensor must transmit an unique code in proper sequence. A magnet must be held close to sensor in order to force sensor to transmit identification code. Receiver also sends a message to Dash Integration Module (DIM) to sound horn once, indicating that sensor properly transmitted an identification code. If a programming sequence is cancelled before any sensor is programmed, or if vehicle's battery is disconnected, receiver will remember all current identification codes. As soon as receiver learns first sensor identification code, all previously stored codes are erased from RCDLR memory.

Programming Sensor

  1. Turn ignition switch to RUN position.
  2. Press remote transmitter lock and unlock buttons simultaneously for several seconds. Horn will chirp to indicate tire pressure monitoring programming mode has been activated.
  3. Beginning with left front tire, install Tire Pressure Monitor Programming Tool (J-41760).
  4. Horn will chirp, indicating left front tire pressure monitoring sensor is programmed.
  5. When horn chirps, proceed to program remaining tire pressure monitoring sensors as follows: right front tire, right rear tire and left rear tire.
  6. After left rear sensor is programmed, horn will chirp twice to indicate programming is complete.

Canceling Sensor Programming

Programming mode will be cancelled if any of these following conditions are met

  1. Ignition switch is turned to OFF position.
  2. All 4 sensors have been programmed.
  3. Tire pressure monitoring system has been in program mode for longer than 5 minutes, and no sensor have been learned.

If more than one minute has passed before next sensor is programmed, all previously stored codes are erased from Remote Control Door Lock Receiver (RCDLR) memory.

WINDOW MOTOR PROGRAMMING - EXPRESS MODE

Note. If battery has been disconnected, each side door window regulator motor will have to be programmed for express mode to operate correctly.

The following steps explain how to program side door window regulator motors

  1. Press and hold power window switch until window is fully down.
  2. Continue holding power window switch for approximately 3 seconds.
  3. Press and hold power window switch until window is fully up.
  4. Continue holding power window switch for approximately 3 seconds.
  5. Power window regulator motor is now programmed for express function.
  6. Repeat this process for all power windows.

VEHICLE COMMUNICATION UNIT/VEHICLE INTERFACE UNIT (ONSTAR(R))

After replacement of Vehicle Communication Unit (VCU) or Vehicle Interface Unit (VIU), OnStar(R) system must be reprogrammed. Press and hold Answer/End Button on OnStar(R) button assembly until system status light changes from Green to Red and back to Green again. Call OnStar(R) call center and select prompt 1. Give operator Electronic Serial Number (ESN) of new VCU or Station ID (STID) number of VIU. Move vehicle outside and let vehicle idle for 10 minutes. Press OnStar(R) call center call button and ask for "Reconfiguration".

PRELIMINARY INSPECTION

Verify customer complaint by operating suspected system. Visually inspect for obvious signs of mechanical and electrical damage. Inspect for blown fuses. For fuse and/or relay identification, refer to illustrations. (Scheme 13)and (Scheme 14). Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If no fault is found, perform self-diagnostics. See SELF-DIAGNOSTIC SYSTEM.

Scheme 13

Scheme 13: PRELIMINARY INSPECTION
Scheme 13: PRELIMINARY INSPECTION

Scheme 14

Scheme 14
Scheme 14

PROBLEM DIAGNOSIS

Intermittent problem diagnosis requires duplication of circuit or component failure in order to identify problem. See TEST PROCEDURES . These procedures may lead to Powertrain Control Module (PCM) recording a DTC which may help diagnosis.

If system does not set a DTC, use scan tool or DVOM to monitor voltage or resistance values while attempting to reproduce conditions which will create an intermittent problem.

When monitoring voltage, ensure specified test conditions are met. When monitoring resistance, ensure ignition switch is in LOCK position or negative battery cable is disconnected. A status change on scan tool or DVOM while performing test procedures indicates area of problem.

Intermittent Simulation

Use the following methods to reproduce conditions causing intermittent problem(s)

  1. Apply light vibration to components.
  2. Apply small amount of heat to component.
  3. Wiggle or bend wiring harness.
  4. Remove/apply vacuum supply source.

Monitor circuit/component voltage or resistance while attempting to simulate intermittent. If vehicle is running, monitor for DTCs. Use test results to identify problem component or circuit.

Symptom Definition

Malfunction Indicator Light (MIL) comes on but does not stay on. A stored DTC may or may not exist.

Possible Causes & Corrections

Use following procedures to determine possible causes of intermittent MIL operation. If problem is not found, duplicate intermittent condition. See PROBLEM DIAGNOSIS.

  1. Check for poor mating of one connector to another. Terminals may not be fully seated. Check for improperly formed or damaged terminals. Check wire-to-terminal connections.
  2. Check for poor connection from ignition coil to ground or arcing at spark plug wires or plugs.
  3. Check for poor connections at PCM ground terminals.
  4. Check for electrical system interference caused by defective relay, PCM-driven solenoid or switch, which may cause sharp electrical surge. This type of problem will normally occur when problem component is operated.
  5. Check for aftermarket parts which may not have been produced to manufacturer's specifications. Solenoids without original equipment diodes for circuit protection or voltage regulators using transistors instead of silicone-chip circuitry may cause voltage surges (up to 300 volts) in PCM wiring, causing temporary PCM shutdown. PCM shutdown is a normal response to system over voltage (over 16 volts on most models). PCM re-powers when condition ceases to exist. A rapid shutdown and re-power could cause a flickering MIL with no DTCs set in memory.
  6. Check for improper installation of electrical accessories such as auxiliary lights, cell phones or 2-way radios.
  7. Ensure ground wire from PCM to distributor or ignition module is connected to a good ground.
  8. Check for intermittent short to ground on data circuits of DLC or in MIL circuit. See appropriate ENGINE PERFORMANCE article in WIRING DIAGRAMS.
  9. On vehicles not equipped with a driver information center, use scan tool to check for intermittent wiring problem. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK

Begin diagnosis of body control system by performing appropriate diagnostic system check for system in which customer concern is apparent. See DIAGNOSTIC SYSTEM CHECK table.

SystemPerform Test
AirbagAIR BAG SYSTEM DIAGNOSTIC SYSTEM CHECK
Air ConditioningAIR CONDITIONING SYSTEM DIAGNOSTIC SYSTEM CHECK
Anti-Lock BrakeANTI-LOCK BRAKE DIAGNOSTIC SYSTEM CHECK
Audible WarningsAUDIBLE WARNINGS DIAGNOSTIC SYSTEM CHECK
Automatic Transmission Shift Lock ControlAUTOMATIC TRANSMISSION SHIFT LOCK CONTROL DIAGNOSTIC SYSTEM CHECK
Cellular CommunicationCELLULAR COMMUNICATION DIAGNOSTIC SYSTEM CHECK
Cruise ControlCRUISE CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK
DefoggerDEFOGGER DIAGNOSTIC SYSTEM CHECK
Disc BrakesDISC BRAKES DIAGNOSTIC SYSTEM CHECK
Door SystemsDOOR SYSTEMS DIAGNOSTIC SYSTEM CHECK
Engine ControlsENGINE CONTROLS DIAGNOSTIC SYSTEM CHECK
Engine CoolingENGINE COOLING DIAGNOSTIC SYSTEM CHECK
Engine ElectricalENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK
Fuel Door & Trunk ReleaseBODY REAR END DIAGNOSTIC SYSTEM CHECK
HornsHORNS DIAGNOSTIC SYSTEM CHECK
Hydraulic BrakesHYDRAULIC BRAKES DIAGNOSTIC SYSTEM CHECK
Instrument ClusterINSTRUMENT CLUSTER DIAGNOSTIC SYSTEM CHECK
Lighting SystemsLIGHTING SYSTEMS DIAGNOSTIC SYSTEM CHECK
Navigation SystemNAVIGATION SYSTEM DIAGNOSTIC SYSTEM CHECK
Park BrakePARK BRAKE DIAGNOSTIC SYSTEM CHECK
Power Seat SystemsPOWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK
Power Sun RoofPOWER SUN ROOF DIAGNOSTIC SYSTEM CHECK
Radio/Audio SystemRADIO/AUDIO SYSTEM DIAGNOSTIC SYSTEM CHECK
Remote Keyless EntryREMOTE KEYLESS ENTRY DIAGNOSTIC SYSTEM CHECK
Retained Accessory PowerRETAINED ACCESSORY POWER DIAGNOSTIC SYSTEM CHECK
Road Sensing SuspensionROAD SENSING SUSPENSION DIAGNOSTIC SYSTEM CHECK
Steering Wheel & Column - TiltSTEERING WHEEL & COLUMN - TILT DIAGNOSTIC SYSTEM CHECK
Theft DeterrentTHEFT DETERRENT DIAGNOSTIC SYSTEM CHECK
Tire Pressuring MonitoringTIRE PRESSURE MONITORING DIAGNOSTIC SYSTEM CHECK
Variable Effort SteeringVARIABLE EFFORT STEERING DIAGNOSTIC SYSTEM CHECK
Wiper/WasherWIPER/WASHER DIAGNOSTIC SYSTEM CHECK

DIAGNOSTIC SYSTEM CHECK

AIR BAG SYSTEM DIAGNOSTIC SYSTEM CHECK

  1. Turn ignition switch to RUN position, and observe AIR BAG indicator. If AIR BAG indicator flashes 7 times, go to next step. If AIR BAG indicator does not flash 7 times, repair air bag system by symptom. For information on air bag DIAGNOSIS & TESTING or DISPOSAL PROCEDURES, see MITCHELL(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, attempt to communicate with Sensing and Diagnostic Module (SDM). If scan tool communicates with SDM, go to next step. If scan tool does not communicate with SDM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  4. Using scan tool, request SIR DTC display. Record displayed DTCs, current and history. If scan tool displays any current or history DTCs, go to next step. If scan tool does not display any current or history DTCs, system is okay at this time.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool displays DTC B1000, perform «DTC B1000: CONTROL MODULE MALFUNCTION»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under DIAGNOSTIC TESTS. If scan tool does not display DTC B1000, perform appropriate test in accordance with DTC retrieved. For information on air bag DIAGNOSIS & TESTING or DISPOSAL PROCEDURES, see MITCHELL(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.

AIR CONDITIONING SYSTEM DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  3. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Dash Integration Module (DIM), Instrument Panel Module (IPM), Powertrain Control Module (PCM) and Rear Integration Module (RIM). If scan tool communicates with DIM, IPM, PCM and RIM, go to next step. If scan tool does not communicate with DIM, IPM, PCM and RIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  4. Using scan tool, select DTCs function for DIM, IPM and PCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair air conditioning system by symptom. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTC B10XX, go to next step. If scan tool displays DTC B10XX, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool does not display DTC B1327 or B1328, go to next step. If scan tool displays DTC B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.
  8. If scan tool displays any DTCs that are associated with air conditioning system, perform appropriate test in accordance with DTC retrieved. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. If scan tool does not display any DTCs that are associated with air conditioning system, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

ANTI-LOCK BRAKE DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Electronic Brake Control Module (EBCM), Continuously Variable Road Sensing Suspension (CVRSS) module, Instrument Panel Module (IPM), Heating Ventilation Air Conditioning (HVAC) control module and Powertrain Control Module (PCM). If scan tool communicates with EBCM, CVRSS module, IPM, HVAC control module and PCM, go to next step. If scan tool does not communicate with EBCM, CVRSS module, IPM, HVAC control module and PCM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DTCs function for EBCM, CVRSS module, IPM, HVAC control module and PCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair anti-lock brakes by symptom. See appropriate ANTI-LOCK article in BRAKES.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1000, B1004, B1007, B1009, B1652 or B1658, go to next step. If scan tool displays DTCs B1000, B1004, B1007, B1009, B1652 or B1658, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool does not display DTCs B1513, B1514, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).If scan tool displays DTCs B1513, B1514, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.

AUDIBLE WARNINGS DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Instrument Panel Module (IPM) and radio. If scan tool communicate with IPM and radio, go to next step. If scan tool does not communicate with IPM and radio, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DTCs function for IPM and radio. If scan tool displays any DTCs for IPM and radio, go to next step. If scan tool does not display any DTCs for IPM and radio, repair instrument panel by symptom. See ANALOG INSTRUMENT PANELS - SEVILLE article.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1000, B1004, B1007, B1009, B1556, B1652, B1656, B1658 or B1805, go to next step. If scan tool displays DTCs B1000, B1004, B1007, B1009, B1556, B1652, B1656, B1658 or B1805, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool does not display DTCs B1327, B1328, B1513, B1514, B1982, B1983, P0560, P0562, P0563, P0621 or P0622, perform appropriate test in accordance with DTC retrieved. See ANALOG INSTRUMENT PANELS - SEVILLE article. If scan tool displays DTCs B1327, B1328, B1513, B1514, B1982, B1983, P0560, P0562, P0563, P0621 or P0622, perform appropriate test in accordance with DTC retrieved. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.

AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool power up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Dash Integration Module (DIM), Powertrain Control Module (PCM) and Rear Integration Module (RIM). If scan tool communicates with DIM, PCM and RIM, go to next step. If scan tool does not communicate with DIM, PCM and RIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DTCs function for DIM, PCM and RIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair shift lock system by symptom. See appropriate SHIFT INTERLOCK SYSTEMS article in AUTOMATIC TRANSMISSIONS.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool does not display DTC B1327, repair shift lock system by symptom. See appropriate SHIFT INTERLOCK SYSTEMS article in AUTOMATIC TRANSMISSIONS. If scan tool displays DTC B1327, repair charging system. See appropriate GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.

BODY REAR END DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Instrument Panel Module (IPM) and Rear Integration Module (RIM). If scan tool communicates with IPM and RIM, go to next step. If scan tool does not communicate with IPM and RIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTC function for IPM and RIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair power trunk and fuel door release by symptom. See POWER TRUNK & FUEL DOOR RELEASE - SEVILLE article.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool does not display DTCs B1327, B1513 or B1514, repair power trunk and fuel door release by symptom. See POWER TRUNK & FUEL DOOR RELEASE - SEVILLE article. If scan tool displays DTCs B1327, B1513 or B1514, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.

CELLULAR COMMUNICATION DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with cellular telephone module and OnStar(R) Vehicle Interface Unit (VIU). If scan tool communicates with cellular telephone module and VIU, go to next step. If scan tool does not communicate with cellular telephone module and VIU, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs function for cellular telephone module and VIU. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair cellular phone as necessary.
  5. If scan tool displays any DTCs which begin with "U", go to next step. If scan tool does not display any DTCs which begin with "U", go to step 7.
  6. If scan tool displays DTC U1500, perform «DTC U1500: ONSTAR(R) SERIAL DATA CIRCUIT FAILURE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under DIAGNOSTIC TESTS. If scan tool does not display DTC U1500, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  7. If scan tool does not display DTC B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  8. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

CRUISE CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Electronic Brake Control Module (EBCM), Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). If scan tool communicates with EBCM, IPC and PCM, go to next step. If scan tool does not communicate with EBCM, IPC and PCM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for IPC. If scan tool does not display any DTCs, go to next step. If scan tool displays any DTCs, perform appropriate test in accordance with DTC retrieved. See ANALOG INSTRUMENT PANELS - SEVILLE article.
  4. Using scan tool, select DISPLAY DTCs for EBCM. If scan tool does not display any DTCs, go to next step. If scan tool displays any DTCs, perform appropriate test in accordance with DTC retrieved. See appropriate ANTI-LOCK article in BRAKES.
  5. Using scan tool, select DISPLAY DTCs for PCM. If scan tool does not display any DTCs, repair cruise control by symptom. See CRUISE CONTROL SYSTEMS - SEVILLE article. If scan tool displays any DTCs, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

DEFOGGER DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Instrument Panel Module (IPM) and Rear Integration Module (RIM). If scan tool communicates with IPM and RIM, go to next step. If scan tool does not communicate with IPM and RIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs for IPM and RIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair rear window and/or heated mirrors by symptom. See REAR WINDOW & MIRROR DEFOGGERS - DEVILLE & SEVILLE article.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1399, B1652, or B1658, go to next step. If scan tool displays DTCs B1399, B1652, or B1658, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool does not display DTCs B1982 or B1983, repair rear window and/or heated mirrors by symptom. See REAR WINDOW & MIRROR DEFOGGERS - DEVILLE & SEVILLE article. If scan tool displays DTCs B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.

DISC BRAKES DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Electronic Brake Control Module (EBCM) and Instrument Panel Module (IPM). If scan tool communicates with EBCM and IPM, go to next step. If scan tool does not communicate with EBCM and IPM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for EBCM and IPM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair disc brakes by symptom. See appropriate DISC & DRUM article in BRAKES.
  4. If scan tool does not displays any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1004 or B1007, go to next step. If scan tool displays DTCs B1004 or B1007, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool does not display DTCs B1513, B1514, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).If scan tool displays DTCs B1513, B1514, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See appropriate GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.

DOOR SYSTEMS DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Driver's Door Module (DDM), Powertrain Control Module (PCM) and Rear Integration Module (RIM). If scan tool communicates with DDM, PCM and RIM, go to next step. If scan tool does not communicate with DDM, PCM and RIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs function for DDM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair power door locks, power mirrors, power windows or remote keyless entry system by symptom. See appropriate article to repair by symptom.
  5. If scan tool does not display DTCs U1161, U1162, U1163 or U1170, go to next step. If scan tool displays DTCs U1161, U1162, U1163 or U1170, perform «DTC U1161-U1163 OR U1170: DRIVER'S DOOR MODULE COMMUNICATION MALFUNCTION»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under DIAGNOSTIC TESTS.
  6. If scan tool does not display DTCs U1713 or U1715, go to next step. If scan tool displays DTCs U1713 or U1715, perform «DTC U1713 OR U1715: WINDOW SENSOR HI SPEED COMMUNICATION CIRCUIT FAILURE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under DIAGNOSTIC TESTS.
  7. If scan tool does not display DTCs U1714 or U1716, go to next step. If scan tool displays DTCs U1714 or U1716, perform «DTC U1714 OR U1716: DRIVER'S DOOR MODULE COMMUNICATION FAILURE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under DIAGNOSTIC TESTS.
  8. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  9. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  10. If scan tool does not display DTCs B1327 or B1328, go to next step. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.
  11. If scan tool does not display DTCs B2757, B2762, B2767, or B2772, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions). If scan tool displays DTCs B2757, B2762, B2767, or B2772, perform appropriate test in accordance with DTC retrieved. See POWER SEATS - SEVILLE article.

ENGINE CONTROLS DIAGNOSTIC SYSTEM CHECK

Note. Check for applicable technical service bulletins before proceeding. Do not perform the following procedure if no driveability conditions exists, unless directed here from another procedure. Do not turn ignition off during the following procedure or clear DTCs unless instructed to do so.

  1. If a condition exists with starting system, perform engine electrical diagnostic system check. See «ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__engine-electrical-diagnostic-system-check). Ensure battery is fully charged and cables are clean and tight. Ensure Powertrain Control Module (PCM) grounds are clean, tight, and in proper location. PCM is located in engine compartment, inside air filter housing. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to establish communication with PCM, Electronic Brake Control Module (EBCM) and Vehicle Theft Deterrent (VTD) module. If scan tool communicates with PCM, EBCM and VTD module, go to next step. If scan tool does not communicate with PCM, EBCM and VTD module, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Attempt to start engine. If engine starts and idles, go to next step. If engine does not start, diagnose engine cranks, but does not start. See NO START DIAGNOSIS in appropriate BASIC DIAGNOSTIC PROCEDURES article in ENGINE PERFORMANCE.
  4. Using scan tool, select DISPLAY DTC function for PCM, EBCM and VTD. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, go to step 9.
  5. Using scan tool, save or capture PCM DTC information, then go to next step.
  6. If scan tool does not display any DTCs that begin with "U", go to next step. If scan tool displays any DTCs that begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  7. If scan tool does not display DTC P0601, P0602, P0603, P0604, P0606 or P1621, go to next step. If scan tool displays DTC P0601, P0602, P0603, P0604, P0606 or P1621, perform appropriate test in accordance with DTC retrieved. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  8. If scan tool displays DTC P0560, P0562, P0563, P0621 or P0622, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTC P0562, P0563, P0621 or P0622, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  9. If customer's concern is not with automatic transmission, go to next step. If customer's concern is with automatic transmission, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
  10. If customer's concern is not with inspection/maintenance, go to next step. If customer's concern is with inspection/maintenance, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  11. If customer's concern is a driveability problem, diagnose by symptom. See appropriate TROUBLE SHOOTING - NO CODES article in ENGINE PERFORMANCE. If customer's concern is not a driveability problem, system is okay at this time.

ENGINE COOLING DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Using scan tool, attempt to communicate with Instrument Panel Module (IPM) and Powertrain Control Module (PCM). If scan tool communicates with IPM and PCM, go to next step. If scan tool does not communicate with IPM and PCM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs function for PCM. If scan tool displays any DTCs, go to next step. If scan tool does not display DTCs, repair engine cooling system by symptom. See appropriate ELECTRIC COOLING FANS article in ENGINE COOLING.
  4. If scan tool displays any DTCs that begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS. If scan tool does not display any DTCs that begin with "U", perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK

  1. Ensure battery is correct battery for vehicle, battery is fully charged and in good working condition. Replace battery as necessary. If battery is okay, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, attempt to communicate with each module on class 2 serial data circuit. See «CLASS 2 SERIAL DATA LINE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__class-2-serial-data-line) under DESCRIPTION & OPERATION. If scan tool communicates with all modules on class 2 serial data circuit, go to next step. If scan tool does not communicate with all modules on class 2 serial data circuit, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. Using scan tool, select DISPLAY DTCs function. If scan tool displays any DTCs, go to next step. If scan tool does not display DTCs, repair charging system by symptom. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.
  6. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  7. If scan tool displays DTCs B1000, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions) If scan tool does not display DTCs B1000, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.

HORNS DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Dash Integration Module (DIM). If scan tool communicates with DIM, go to next step. If scan tool does not communicate with DIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs function for DIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair horns by symptom. See STEERING COLUMN SWITCHES - SEVILLE article.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1007 or B1009, go to next step. If scan tool displays DTCs B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

HYDRAULIC BRAKES DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Electronic Brake Control Module (EBCM) and Instrument Panel Cluster (IPC). If scan tool communicates with EBCM and IPC, go to next step. If scan tool does not communicate with EBCM and IPC, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs function for EBCM and IPC. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair hydraulic brakes by symptom. See appropriate article in BRAKES.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool displays DTCs B1513, B1514, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1513, B1514, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See appropriate ANTI-LOCK article in BRAKES.

INSTRUMENT CLUSTER DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Dash Integration Module (DIM), Electronic Brake Control Module (EBCM), Sensing And Diagnostic Module (SDM), Instrument Panel Cluster (IPC), Instrument Panel Module (IPM), Powertrain Control Module (PCM), Rear Integration Module (RIM) and theft deterrent module. If scan tool communicates with all modules, go to next step. If scan tool does not communicate with all modules, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for DIM, EBCM, SDM, IPC, IPM, PCM, RIM and theft deterrent module. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair instrument panel by symptom. See ANALOG INSTRUMENT PANELS - SEVILLE article.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1000, B1004, B1007, B1009, B1390, B1556, B1652, B1656, B1658, or B1805, go to next step. If scan tool displays DTCs B1000, B1004, B1007, B1009, B1390, B1556, B1652, B1656, B1658, or B1805, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool displays DTCs B1327, B1328, B1513, B1514, B1982, B1983, P0560, P0562, P0563, P0615, P0621, or P0622, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327, B1328, B1513, B1514, B1982, B1983, P0560, P0562, P0563, P0615, P0621, or P0622, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

LIGHTING SYSTEM DIAGNOSTIC CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to establish communication with Dash Integration Module (DIM), Instrument Panel Module (IPM), Rear Integration Module (RIM) and Instrument Panel Cluster (IPC). If scan tool communicates with DIM, IPM, RIM and IPC, go to next step. If scan tool does not communicate with DIM, IPM, RIM and IPC, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs function for DIM, IPM RIM and IPC. If scan tool displays any DTC, go to next step. If scan tool does not display any DTCs, repair lighting system by symptom. See appropriate EXTERIOR LIGHTS article.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1000, B1004, B1007, or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007, or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

NAVIGATION SYSTEM DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TEST.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Navigation Module (NAV) and Navigation Display Head (NDH) control module. If scan tool communicates with NAV and NDH control module, go to next step. If scan tool does not communicate with NAV and NDH control module, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for NAV and NDH control module. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair navigation system by symptom. See appropriate NAVIGATION SYSTEMS article.
  4. If scan tool displays any DTCs which begin with "U", go to next step. If scan tool does not display any DTCs which begin with "U", go to step 6.
  5. If scan tool displays DTCs U2150, U2151 or U2153, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions). If scan tool does not display DTCs U2150, U2151 or U2153, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

PARK BRAKE DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Instrument Panel Cluster (IPC) and Rear Integration Module (RIM). If scan tool communicates with IPC and RIM, go to next step. If scan tool does not communicate with IPC and RIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for IPC and RIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair parking brake by symptom. See appropriate article in BRAKES.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool displays DTCs B1327, B1328, B1513, B1514, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327, B1328, B1513, B1514, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Memory Seat Module (MSM), Driver's Door Module (DDM), Passenger's Front Door Module (PFDM), Left Rear Door Module (LRDM), Right Rear Door Module (RRDM) and Rear Integration Module (RIM). If scan tool communicates with MSM, DDM, PFDM, LRDM, RRDM and RIM, go to next step. If scan tool does not communicate with MSM, DDM, PFDM, LRDM, RRDM and RIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs for MSM, DDM, PFDM, LRDM, RRDM and RIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair power seat by symptom. See POWER SEATS - SEVILLE article.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

POWER SUN ROOF DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Dash Integration Module (DIM) and Rear Integration module (RIM). If scan tool communicates with DIM and RIM, go to next step. If scan tool does not communicate with DIM and RIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs for DIM and RIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair power sun roof by symptom. See POWER SUN ROOFS - DEVILLE & SEVILLE article.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

RADIO/AUDIO SYSTEM DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with radio, Instrument Panel Module (IPM), Compact Disc (CD) changer and Dash Integration Module (DIM). If scan tool communicates with radio, IPM, CD changer and DIM, go to next step. If scan tool does not communicate with radio, IPM, CD changer and DIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs for radio, IPM, CD changer and DIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair radio/audio system as necessary.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1004, B1007 or B1009, go to next step. If scan tool displays DTCS B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool displays DTC B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTC B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

REMOTE KEYLESS ENTRY DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool power up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Remote Control Door Lock Receiver (RCDLR). If scan tool communicates with RCDLR, go to next step. If scan tool does not communicate with RCDLR, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs for RCDLR. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair remote keyless entry system by symptom. See POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - SEVILLE article.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1000 or B1004, go to next step. If scan tool displays DTCs B1000 or B1004, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool displays DTC B1327, repair charging system. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEM. If scan tool does not display DTC B1327, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

RETAINED ACCESSORY POWER DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with each module on class 2 serial data circuit. See «CLASS 2 SERIAL DATA LINE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__class-2-serial-data-line) under DESCRIPTION & OPERATION. If scan tool communicates with each module, go to next step. If scan tool does not communicate with each module, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for each module. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair retained accessory power as necessary. See appropriate POWER DISTRIBUTION article in WIRING DIAGRAMS.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1000, B1004, B1007, B1009, B1390, B1656, B1658 and B1805, go to next step. If scan tool displays DTCs B1000, B1004, B1007, B1009, B1390, B1656, B1658 and B1805, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

ROAD SENSING SUSPENSION DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform, «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Continuously Variable Road Sensing Suspension (CVRSS) module, Electronic Brake Control Module (EBCM) and Powertrain Control Module (PCM). If scan tool communicates with CVRSS module, EBCM and PCM, go to next step. If scan tool does not communicate with CVRSS module, EBCM and PCM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for CVRSS module, EBCM and PCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair road sensing suspension by symptom. See appropriate ELECTRONIC - CV ROAD SENSING article in SUSPENSION.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  5. If scan tool does not display any PCM DTCs, go to next step. If scan tool displays any PCM DTCs, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  6. If scan tool does not display any EBCM DTCs, go to next step. If scan tool displays any EBCM DTCs, perform appropriate test in accordance with DTC retrieved. See appropriate ANTI-LOCK article in BRAKES.
  7. If scan tool does not display DTC C0550, go to next step. If scan tool displays DTC C0550, repair electronic suspension. See appropriate ELECTRONIC - CV ROAD SENSING article in SUSPENSION.
  8. If scan tool does not display DTC C0563, go to next step. If scan tool displays DTC C0563, repair electronic suspension. See appropriate ELECTRONIC - CV ROAD SENSING article in SUSPENSION.
  9. If scan tool does not display DTC C0696, go to next step. If scan tool displays DTC C0696, repair electronic suspension. See appropriate ELECTRONIC - CV ROAD SENSING article in SUSPENSION.
  10. If scan tool does not display DTC C0896, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions). If scan tool displays DTC C0896, repair electronic suspension. See appropriate ELECTRONIC - CV ROAD SENSING article in SUSPENSION.

STEERING WHEEL & COLUMN - TILT DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with steering column control module. If scan tool does not communicate with steering column control module, go to next step. If scan tool communicates with steering column control module, go to step 4.
  3. Using scan tool, attempt to operate tilt/telescoping steering column IN/OUT/UP/DOWN functions. If steering column moves to appropriate positions, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS. If steering column does not move to appropriate positions, repair tilt/telescoping steering column by symptom. See STEERING COLUMN SWITCHES - SEVILLE article.
  4. Using scan tool, select DISPLAY DTCs for steering column control module. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair tilt/telescoping steering column by symptom. See STEERING COLUMN SWITCHES - SEVILLE article.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1007 or B1009, go to next step. If scan tool displays DTCs B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

THEFT DETERRENT DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Driver's Door Module (DDM), Dash Integration Module (DIM), Powertrain Control Module (PCM), Remote Control Door Lock Receiver (RCDLR), Rear Integration Module (RIM), theft deterrent control module and Instrument Panel Cluster (IPC). If scan tool communicates with DDM, DIM, PCM, RCDLR, RIM, theft deterrent control module and IPC, go to next step. If scan tool does not communicate with DDM, DIM, PCM, RCDLR, RIM, theft deterrent control module and IPC, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs for DDM, DIM, PCM, RCDLR, RIM theft deterrent control module and IPC. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair theft deterrent system by symptom. See ANTI-THEFT SYSTEMS - SEVILLE article.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs P0601, P0602, P0603, P0604, P0606 or P1621, go to next step. If scan tool displays DTCs P0601, P0602, P0603, P0604, P0606 or P1621, perform appropriate test in accordance with DTC retrieved. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  7. If scan tool does not display DTCs B1007 or B1009, go to next step. If scan tool displays DTCs B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  8. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

TIRE PRESSURING MONITORING DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Remote Control Door Lock Receiver (RCDLR). If scan tool communicates with RCDLR, go to next step. If scan tool does not communicate with RCDLR, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for Remote Keyless Entry (RKE) system. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  4. If scan tool does not display any RKE system DTCs, go to next step. If scan tool displays any RKE DTCs, perform appropriate test in accordance with DTC retrieved. See POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - SEVILLE article.
  5. If scan tool displays any tire pressure monitoring DTCs, perform appropriate test in accordance with DTC retrieved. See ANALOG INSTRUMENT PANELS - SEVILLE article. If scan tool does not display any tire pressure monitoring DTCs, system is okay at this time.

VARIABLE EFFORT STEERING DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Start engine. Using scan tool, attempt to communicate with Electronic Brake Control Module (EBCM). If scan tool communicates with EBCM, go to next step. If scan tool does not communicate with EBCM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs for magnasteer. If scan tool does not display any DTCs for Dynamic Rear Proportioning (DRP)/Anti-Lock Brake System (ABS)/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) (if equipped), go to next step. If scan tool displays any DTCs for DRP/ABS/TCS/VSES (if equipped), perform appropriate test in accordance with DTC retrieved. See appropriate ANTI-LOCK article in BRAKES.
  4. Using scan tool, select DISPLAY DTC for magnasteer. If scan tool displays DTCs C1241, perform appropriate test. See appropriate ELECTRONIC article in ELECTRONIC STEERING. If scan tool does not display DTC C1241, repair power steering system by symptom. See appropriate article in STEERING.

WIPER/WASHER DIAGNOSTIC SYSTEM CHECK

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not) under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Dash Integration Module (DIM). If scan tool communicates with DIM, go to next step. If scan tool does not communicate with DIM, perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  3. Using scan tool, access class 2 power mode. Cycle ignition switch through all positions, while observing ignition switch power mode parameter. If ignition switch parameter matches ignition switch positions, go to next step. If ignition switch parameter does not match ignition switch positions, perform «TEST C: POWER MODE MISMATCH»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-c-power-mode-mismatch) under SYSTEM TESTS.
  4. Using scan tool, select DISPLAY DTCs for DIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair wiper/washer system by symptom. See WIPER/WASHER SYSTEMS - SEVILLE article.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform «TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-b-scan-tool-does-not) under SYSTEM TESTS.
  6. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).
  7. If scan tool does not display DTCs B1327 or B1328, repair wiper/washer system by symptom. See WIPER/WASHER SYSTEMS - SEVILLE article. If scan tool displays DTCs B1327 or B1328, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions).

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTCDescriptionPerform Test
B0001Vehicle Speed Not Detected(1)
B0016Instrument Panel Module Deployment Loop Resistance Low(2)
B0017Instrument Panel Module Deployment Loop Resistance High(2)
B0018Instrument Panel Module High/Low Circuits Shorted(2)
B0022Steering Wheel Module Deployment Loop Resistance Low(2)
B0024Steering Wheel Module Circuit Malfunction(2)
B0026Steering Wheel Module Deployment Loop Resistance High(2)
B0028Right Front Side Impact Module Resistance Low(2)
B0029Right Front Side Impact Module Resistance High(2)
B0030Right Front Side Impact Module Circuits Shorted(2)
B0040Left Front Side Impact Module Resistance Low(2)
B0041Left Front Side Impact Module Resistance High(2)
B0045Left Front Side Impact Module Circuits Shorted(2)
B0051Air Bag Deployed With No Faults Present(2)
B0053Air Bag Deployed With Faults Present(2)
B0057Right Front Seat Belt Pretensioner Resistance Low(2)
B0058Right Front Seat Belt Pretensioner Resistance High(2)
B0059Right Front Seat Belt Pretensioner Circuits Shorted(2)
B0064Left Front Seat Belt Pretensioner Resistance Low(2)
B0065Left Front Seat Belt Pretensioner Resistance High(2)
B0066Left Front Seat Belt Pretensioner Circuits Shorted(2)
B0077Sensing & Diagnostic Module Does Not Receive Valid Message(2)
B0078Right Side Impact Sensor Does Not Send Valid Message(2)
B0079Left Side Impact Sensor Does Not Send Valid Message(2)
B0080Left Side Impact Sensor Malfunction(2)
B0081Right Side Impact Sensor Malfunction(2)
B0082Invalid Message From Right Side Impact Sensor(2)
B1000Control Module MalfunctionDTC B1000
B1001Restraints ID Does Not Match ID In Dash Integration Module(2)
B1004Keep Alive MemoryDTC B1004
B1007EEPROM Write ErrorDTC B1007
B1009EEPROM Checksum ErrorDTC B1009
B1245Radio Detects Loss Of E&C CommunicationsDTC B1245
B1271Radio Theft Lock Activated(3)
B1310Ambient Air Temperature Sensor Failure(4)
B1317In Car Temperature Sensor Failure(4)
B1318Left Sun Load Sensor Failure(4)
B1321A/C Low Side Temperature Sensor Failure(4)
B1324A/C Refrigerant Overpressure(4)
B1327Device Power Circuit Low(5)
B1328Device Power Circuit High(5)
B1328Right Sun Load Sensor Failure(4)
B1330Left A/C Discharge Sensor Failure(4)
B1331Right A/C Discharge Sensor Failure(4)
B1332Left Heater Discharge Sensor Failure(4)
B1333Right Heater Discharge Sensor Failure(4)
B1340Left Air Mix Door No. 1 Movement Failure(4)
B1341Air Mix Door No. 2 Movement Failure(4)
B1343Air Inlet Actuator Failure(4)
B1344HTR/DEF/A/C Door Movement Failure(4)
B1390Device Voltage Reference Input Circuit MalfunctionDTC B1390
B1396Tilt/Telescope Position Sensor Failure(6)
B1399Control Module Malfunction(4)
B1513Dash Integration Module Voltage Low(5)
B1514Dash Integration Module Voltage High(5)
B1556Odometer Mileage Within EEPROM DisagreeDTC B1556
B1562, B1567, B1572, Or B1577Driver's Door Switch Assembly Failure(7)
B1581, B1591, B1611 Or B1621Mirror Position Sensor Failure(7)
B1652Loss Of Keep Alive MemoryDTC B1652
B1656EEPROM Write ErrorDTC B1656
B1658EEPROM Checksum ErrorDTC B1658
B1717Driver's Door Switch Assembly Malfunction(7)
B1735, B1740, B1745, B1750, B1755, B1760, B1815, B1820, B1830, B1835, B1840, B1845, B1940 Or B1945Power Seat Switch Failure(8)
B1805Ignition Switch Circuit MalfunctionDTC B1805
B1825, B1850, B1860, B2355, B2365 Or B2375Seat Position Sensor Malfunction(8)
B1870Power Seat Switch Circuit Malfunction(8)
B1875Power Seat Motor Reached End Of Travel(8)
B1900Positioning Sensor Voltage Out Of Range(8)
B1982Device Power Circuit High(5)
B1983Device Power Circuit Low(5)
B2175Tilt/Telescope Switch Input Malfunction(6)
B2220-B2224 Or B2226Rear Door Lock Voltage Malfunction(9)
B2419Twilight Photocell Circuit Malfunction(10)
B2420Twilight Delay Pot Sensor Failure(10)
B2422Interior Light Rheostat Failure(10)
B2460TV Antenna Module Circuit Malfunction(1)
B2461Video Synchronization Circuit Malfunction(1)
B2462Global Positioning Satellite Antenna Failure(1)
B2463Navigation Module Internal Failure(1)
B2464Laser Focus Error(1)
B2465Navigation Module Detects Incorrect CD(1)
B2466Navigation Module Detects Internal Error(1)
B2468Navigation Display Head Internal Failure(1)
B2474Backlighting Error Detected By Navigation Display Head(1)
B2475Auxiliary Detection Signal Circuit Failure(1)
B2476Keypad Low Reference Circuit Voltage Malfunction(11)
B2510A/C Steering Wheel Controls Key Stuck(4)
B2511Radio Steering Wheel Controls Key Stuck(6)
B2512Steering Wheel Controls Circuit Malfunction(6)
B2734Memory Checksum Write Error(12)
B2757, B2762, B2767 Or B2772Memory Recall Switch Malfunction(8)
B2853, B2858, B2873 Or B2878Tilt/Telescope Switch Malfunction(6)
B2860Telescope Actuator Position Sensor Voltage High(6)
B2862Telescope Actuator Position Sensor Voltage Low(6)
B2880Tilt Actuator Position Sensor Voltage High(6)
B2882Tilt Position Sensor Voltage Low(6)
B2891Tilt/Telescope Motor Circuit Malfunction(6)
B2904Tilt/Telescope Switch Circuit Malfunction(6)
B2947Theft Deterrent Exciter Module Voltage Low(12)
B2948Theft Deterrent Exciter Module Voltage Malfunction(12)
B2960Ignition Key Code Mismatch(12)
B3031Learned Coded Key Setting On(12)
B3055Ignition Key Value Malfunction(12)
B3109Remote Transmitter Battery Low(9)
B3142, B3147, B3152 Or B3157Door Lock Switch Signal Circuit Malfunction(9)
B3172, B3177, B3182, B3187, B3192, B3197, B3282, B3287 Or B3292Passenger's Door Module Message Failure(13)
B3377, B3382, B3387, B3392, B3397, B3452, B3457, B3462, B3467, B3472, B3477, B3482, B3517 Or B3522Driver's Door Switch Malfunction(13)
B3527Power Window Switch Input Malfunction(13)
B3793Memory Seat Module Voltage Malfunction(8)
B3832 Or B3833Power Window Lock-Out Malfunction(13)
C0550Control Module Internal Failure(14)
C0563Control Module Calibration Failure(14)
C0577, C0578, C0579, C0582, C0583, C0584, C0587, C0588, C0589, C0592, C0593, Or C0594Strut Actuator Voltage Malfunction(14)
C0615, C0620, C0625 Or C0630Position Sensor Voltage Malfunction(14)
C0635, C0638, C0640, C0643, C1252 Or C1253Normal Force Signal Circuit Malfunction(14)
C0657 Or C0658Compressor Motor Circuit Malfunction(14)
C0662 Or C0663Exhaust Solenoid Control Circuit Malfunction(14)
C0665Lift/Dive Circuit Malfunction(14)
C0690, C0691 Or C0693Damper Driver Relay Circuit Malfunction(14)
C0696Position Sensor Voltage Malfunction(14)
C0710Steering Position Signal Input Malfunction(14)
C0750, C0755, C0760 Or C0765Tire Pressure Monitoring Sensor Failure(15)
C0896Control Module Supply Voltage Malfunction(14)
C1211Anti-Lock Brake System Indicator Voltage High(16)
C1214System Voltage Low(16)
C1217Pump Motor Voltage Malfunction(16)
C1218System Voltage High(16)
C1221-C1235Wheel Speed Sensor Malfunction(16)
C1236Ignition Voltage Low(16)
C1327Electronic Brake Control Module Detects High System Voltage(16)
C1238Brake Rotor Temperature High(16)
C1241Magnasteer Actuator Circuit Open Or Shorted(14)
C1242 Or C1243Pump Motor Control Malfunction(16)
C1246Brake Lining Wear Circuit Open(16)
C1248Dynamic Rear Proportioning Malfunction(16)
C1251Information DTC(16)
C1254Loss Of Keep Alive Memory(16)
C1255 Or C1246Electronic Brake Control Module Malfunction(16)
C1261-C1274Ignition Voltage High(16)
C1276, P1644 Or P1689Delivered Torque Signal Malfunction(16)
C1277 Or P1571Requested Torque Signal Malfunction(16)
C1278Electronic Brake Control Module Disabled Traction Control System(16)
C1281, C1283 Or C1286Yaw Rate Input Malfunction(16)
C1282Yaw Rate Input Error(16)
C1284 Or C1285Lateral Accelerometer Sensor Malfunction(16)
C1287 Or C1288Steering Wheel Position Sensor Out Of Phase(16)
C1291 Or C1293Stoplight Switch Malfunction(16)
C1294Stoplight Switch Circuit Short To Voltage(16)
C1295Stoplight Switch Circuit Inactive(16)
PXXXXPowertrain Control Module Malfunction(17)
U1000 & U1255Class 2 Communication MalfunctionDTC U1000 & U1255
U1001-U1254Loss Of XXX CommunicationDTC U1001-U1254
U1161-U1163 Or U1170Driver's Door Module Communication MalfunctionDTC U1161-U1163 OR U1170
U1300Class 2 Short To GroundDTC U1300
U1301Class 2 Short To VoltageDTC U1301
U1305Loss Of Class 2 Serial Data CommunicationDTC U1305
U1500OnStar(R) Serial Data Circuit FailureDTC U1500
U1713 Or U1715Window Sensor High Speed Communication Circuit FailureDTC U1713 OR U1715
U1714 Or U1716Driver's Door Module Communication FailureDTC U1714 OR U1716
U2150Loss Of Communication With Navigation ProcessorDTC U2150
U2151Navigation Display Serial Data High/Low CircuitDTC U2151
U2153Navigation Module Internal FailureDTC U2153
(1) Repair navigation system as necessary. See appropriate NAVAGIATION SYSTEMS article (2) For information on air bag DIAGNOSIS & TESTING or DISPOSAL PROCEDURES, see MITCHELL(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS. (3) Repair radio as necessary. (4) See appropriate AUTOMATIC A/C-HEATER SYSTEM article in AIR CONDITIONING & HEATING. (5) See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS. (6) See STEERING COLUMN SWITCHES - SEVILLE article. (7) See POWER MIRRORS - SEVILLE article. (8) See POWER SEATS - SEVILLE article. (9) See POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - SEVILLE article. (10) See HEADLIGHTS - AUTOMATIC TWILIGHT SENTINEL - SEVILLE article. (11) Repair cellular phone as necessary. (12) See ANTI-THEFT SYSTEMS - SEVILLE article. (13) See POWER WINDOWS - SEVILLE article. (14) See appropriate ELECTRONIC article in SUSPENSION. (15) See ANALOG INSTRUMENT PANELS - SEVILLE article. (16) See appropriate ANTI-LOCK article in BRAKES. (17) See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
(1)Repair navigation system as necessary. See appropriate NAVAGIATION SYSTEMS article
(2)For information on air bag DIAGNOSIS & TESTING or DISPOSAL PROCEDURES, see MITCHELL(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.
(3)Repair radio as necessary.
(4)See appropriate AUTOMATIC A/C-HEATER SYSTEM article in AIR CONDITIONING & HEATING.
(5)See GENERATORS & REGULATORS - SEVILLE article in STARTING & CHARGING SYSTEMS.
(6)See STEERING COLUMN SWITCHES - SEVILLE article.
(7)See POWER MIRRORS - SEVILLE article.
(8)See POWER SEATS - SEVILLE article.
(9)See POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - SEVILLE article.
(10)See HEADLIGHTS - AUTOMATIC TWILIGHT SENTINEL - SEVILLE article.
(11)Repair cellular phone as necessary.
(12)See ANTI-THEFT SYSTEMS - SEVILLE article.
(13)See POWER WINDOWS - SEVILLE article.
(14)See appropriate ELECTRONIC article in SUSPENSION.
(15)See ANALOG INSTRUMENT PANELS - SEVILLE article.
(16)See appropriate ANTI-LOCK article in BRAKES.
(17)See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

Description

An internal fault detection is handled inside a control module. No external circuits are involved. A control module runs a program to detect an internal fault when power up is commanded. Only requirements are voltage and ground. This program runs even if voltage is out of valid operating range. A control module first writes information to a cell, or address, then adds 0.25 to value, and calculates a check sum. If this checksum minus 0.25 is not equal to a cell value, a module will store DTC. A history DTC clears when a control module ignition cycle counter reaches reset threshold, without a repeat of malfunction.

Code Enable Criteria

The following must occur for DTC to run

  1. A control module refuses all additional inputs.
  2. A control module first writes information to a cell, or address, then adds 0.25 to value, and calculates a check sum. If this checksum minus 0.25 is not equal to a cell value, a control module will store DTC.

Testing

  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, retrieved DTCs. If DTC B1000 is retrieved as current, go to next step. If DTC B1000 is not retrieved as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-aids).
  3. Replace control module. Program control module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__code-enable-criteria). If DTC resets, repeat test beginning at step 2.

Diagnostic Aids

This DTC may be stored as a history without affecting operation of a control module. If stored only as a history DTC, and not retrieved as current, DO NOT replace control module. If this DTC is retrieved as both a current and history DTC, replace control module.

Control module compares periodic check sum to running check sum. If they do not match, DTC B1004 will store. When DTC is stored, control module will operate from preset critical operating data until new data is learned and stored in keep alive memory. DTC will clear when control module calculates a successful comparison of periodic check sum to running check sum.

The following must occur for DTC to run

  1. Control module will operate from preset critical operating data until new data is learned and stored in keep alive memory.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, retrieved DTCs. If DTC B1004 is retrieved as current, go to next step. If DTC B1004 is not retrieved as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  3. Replace control module. Program control module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

This DTC may be stored as a history without affecting operation of a control module. If stored only as a history DTC, and not retrieved as current, DO NOT replace control module. If this DTC is retrieved as both a current and history DTC, replace control module.

A control module performs internal tests on EEPROM each time module performs a write function to a memory address in EEPROM. Module reads back data that has been written and compares it to the data. DTC will store when data read back after a write does not match data being written 3 consecutive times. When DTC is stored, control module finds another area to write information to. This new area becomes permanent area for storage of this information. DTC will clear when control module makes a successful write to EEPROM.

The following must occur for DTC to run

  1. Control module runs a program to detect a write error when ever it writes to EEPROM. Only requirements are voltage and ground. This program runs even if voltage is out of valid operating range.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, retrieved DTCs. If DTC B1007 is retrieved as current, go to next step. If DTC B1007 is not retrieved as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  3. Replace control module. Program control module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

This DTC may be stored as a history without affecting operation of a control module. If stored only as a history DTC, and not retrieved as current, DO NOT replace control module. If this DTC is retrieved as both a current and history DTC, replace control module.

EEPROM check sum error detection is handled inside control module. No external circuits are involved. Control module compares its previously stored checksum with checksum calculated when ignition switch is first turned to RUN position. If 2 checksums do not match calculated checksum, module will indicate a calibration malfunction (checksum error) and DTC will store. When DTC is stored, control module will operate from preset critical operating data for those blocks of data that have failed check sum test. Blocks of data that have not failed check sum test are not affected. DTC will clear when control module runs a successful check sum test of EEPROM.

The following must occur for DTC to run

  1. Control module retains an inverse copy of a digital value stored in certain blocks of memory in EEPROM. Control module then reads information from those certain blocks and adds stored inverse value to current value. If they do not equal zero, control module stores this DTC.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, retrieved DTCs. If DTC B1009 is retrieved as current, go to next step. If DTC B1009 is not retrieved as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  3. Replace control module. Program control module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

This DTC may be stored as a history without affecting operation of a control module. If stored only as a history DTC, and not retrieved as current, DO NOT replace control module. If this DTC is retrieved as both a current and history DTC, replace control module.

Radio and Compact Disc (CD) player communicate through serial data E&C circuit. Radio shall store a current status for this DTC when it detects a loss of E&C communications with CD player. Radio will ignore CD changer when this DTC is current. CD changer will not operate. This DTC is cleared when ignition cycles from OFF to RUN positions.

The following must occur for DTC to run

  1. DTC B1327 is not stored as current.
  1. If radio/audio system diagnostic system check has been performed, go to next step. If radio/audio system diagnostic system check has not been performed, perform «RADIO/AUDIO SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__radioaudio-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Insert one Compact Disc (CD) into CD changer. Turn ignition switch to RUN position. Turn radio on, and attempt to play CD changer. If CD changer does not operate, go to next step. If CD changer operates, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) .
  3. Turn ignition switch to OFF position. Disconnect CD changer 10-pin harness connector. Inspect Orange wire for an open or high resistance between rear fuse block and CD changer harness connector terminal No. 5. If problem does not exist, go to next step. If problem exists, repair Orange wire as necessary. After repair, go to step 11 .
  4. Inspect Black/White wire for an open or high resistance between ground and CD changer harness connector terminal No. 7. Ground point is located in power seat harness to body wiring harness, below driver's seat. If problem does not exist, go to next step. If problem exists, repair Black/White wire as necessary. After repair, go to step 11 .
  5. Measure voltage between ground and CD changer harness connector terminal No. 10 (Dark Green wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 8 .
  6. Inspect Dark Green wire for an open, short or high resistance between CD changer harness connector terminal No. 10 and radio harness connector terminal E1. If problem does not exist, go to next step. If problem exists, repair Dark Green wire as necessary. After repair, go to step 11 .
  7. Inspect radio harness connector for poor connections. If problem does not exist, go to step 9 . If problem exists, repair radio harness connector as necessary. After repair, go to step 11 .
  8. Inspect CD changer harness connector for poor connections. If problem does not exist, go to step 10 . If problem exists, repair CD changer harness connector as necessary. After repair, go to step 11 .
  9. Replace radio, then go to step 11 .
  10. Replace CD changer, then go to next step.
  11. Operate system to verify repair. If system does not operate correctly, repeat test beginning at step 2 .

Dash Integration Module (DIM) has an internal battery voltage sensor and a reference voltage. DIM compares these voltages every 500 milliseconds. This DTC shall be stored after 10 consecutive readings that 2 battery voltages differ by one volt or more. All writes to EEPROM will be suspended. All loss of communication and high/low voltage DTCs are suspended. A current DTC clears when a malfunction no longer exists. A history DTC clears when module ignition cycle counter reaches reset threshold, without a repeat of malfunction.

The following must occur for DTC to run

  1. This DTC shall be stored after 10 consecutive readings that 2 battery voltages differ by one volt or more.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect Dash Integration Module (DIM) C1 (24-pin) and C3 (10-pin) harness connectors. Turn ignition switch to RUN position. Measure voltage between DIM harness connector C1 terminals A12 (Orange wire) and B12 (Black/White wire). Measure voltage between DIM harness connector C3 terminals "G" (Orange wires) and DIM harness connector "E" (Black/White wires). (Scheme 15) Compare both voltage measurements. If voltage difference is one volt or more, go to next step. If voltage difference is less than one volt, go to step 5.
  3. Inspect Orange wire for an open or high resistance between DIM harness connector C1 terminal A12 and rear fuse block. Inspect Orange wire for an open or high resistance between DIM harness connector C3 terminal "G" and rear fuse block. Rear fuse block is located below rear seat. (Scheme 1) If problem does not exist, go to next step. If problem exists, repair Orange wire as necessary. After repair, go to step 7.
  4. Inspect Black/White wire for an open or high resistance between ground and DIM harness connectors C1 terminal B12, C3 terminal "E". Inspect Black/White wire for an open or high resistance between ground and DIM harness connector C3 terminal "E". If problem does not exist, go to next step. If problem exists, repair Black/White wire as necessary. After repair, go to step 7.
  5. Inspect DIM harness connector for poor connections. If problem does not exist, go to next step. If problem exists, repair DIM harness connector as necessary. After repair, go to step 7.
  6. Replace DIM. Program DIM. See «DASH INTEGRATION MODULE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under PROGRAMMING. After repair, go to step 7.
  7. Using scan tool, clear DTCs. Operate vehicle under code enable criteria conditions. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

Scheme 15

Scheme 15
Scheme 15

Instrument Panel Cluster (IPC) uses no external circuits for operation that stores this DTC. IPC stores 3 redundant copies of vehicle odometer mileage within EEPROM. In stored mileage records, 3 EEPROM mileage records must agree. If 3 EEPROM redundant copies of vehicle odometer mileage, DTC will be stored. IPC displays ERROR in odometer. Odometer will not operate. Trip odometer is not affected. Diagnostic test is performed once every 0.3 seconds during normal running mode. A current DTC clears when malfunction no longer exists. A history DTC clears when module ignition cycle counter reaches reset threshold without a repeat of malfunction.

The following must occur for DTC to run

  1. Three EEPROM redundant copies of vehicle odometer mileage disagree.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, retrieve DTCs. If DTC B1556 is retrieved as current, go to next step. If DTC B1556 is not retrieved as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  3. Replace IPC. After repair, go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria conditions. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

This DTC may be stored as a history without affecting operation of control module. If stored only as history, DO NOT replace control module. If DTC is retrieved as both a current and history, replace control module. This DTC will never store as current during testing, unless there is a non-recoverable memory failure.

Control module calculates check sum on areas of memory that hold critical operation data at regular intervals (periodic check sum). Control module also calculates check sum on memory locations when new data is written (running check sum). Control module compares periodic check sum to running check sum. If they do not match, DTC is stored. When DTC is stored, control module will operate from preset critical operating data until new data is learned and stored in keep alive memory. A current DTC clears when malfunction no longer exists. A history DTC clears when module ignition cycle counter reaches reset threshold, without repeat of malfunction.

The following must occur for DTC to run

  1. Periodic check sum and running check sum do not match.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, retrieved DTCs. If DTC B1652 is retrieved as current, go to next step. If DTC B1652 is not retrieved as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  3. Replace control module. Program control module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

This DTC may be stored as a history without affecting operation of control module. If stored only as history, DO NOT replace control module. If DTC is retrieved as both a current and history, replace control module. This DTC will never store as current during testing, unless there is a non-recoverable memory failure.

Each module performs internal tests on EEPROM each time control module performs a write function to a memory address in EEPROM. Control module reads back data that has been written and compares it to incoming data. If data does not match after 3 consecutive write and verify attempts, control module will indicate a write malfunction is current. DTC will store when data read back after a write does not match data being written 3 consecutive times. When DTC is stored, control module finds another area to write information to. This new area becomes permanent area for storage of this information.

The following must occur for DTC to run

  1. When data read back after a write does not match data being written 3 consecutive times.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, retrieve DTCs. If DTC B1656 is retrieved as current, go to next step. If DTC B1656 is not retrieved as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  3. Replace control module. Program control module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

This DTC may be stored as a history without affecting operation of control module. If DTC is retrieved only as history, DO NOT replace control module. If DTC is retrieved as both a current and history, replace control module.

EEPROM check sum error detection is handled inside control module. No external circuits are involved. Control module retains an inverse copy of digital value stored in certain blocks of memory in EEPROM. Control module then reads information from certain blocks and adds stored inverse value to current value. If they do not equal zero, control module will store DTC B1658. When DTC is stored, control module reverts to base operation values programmed for those blocks of data. Blocks of data that did not fail check sum test are not affected.

The following must occur for DTC to run

  1. Control module then reads information from certain blocks and adds stored inverse value to current value. If they do not equal zero, control module will store DTC B1658.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to RUN position. Using scan tool, retrieve DTCs. If DTC B1658 is retrieved as current, go to next step. If DTC B1658 is not retrieved as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  3. Replace control module. Program control module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. If DTC resets, repeat test beginning at step 2.

This DTC may be stored as a history without affecting operation of module. If DTC is retrieved only as history, DO NOT replace module. If DTC is retrieved as both a current and history, replace module.

Normal class 2 communication does not begin until system power mode has been identified. Dash Integration Module (DIM) monitors 4 discrete wires from ignition switch contacts to determine present power mode (ignition switch position). DIM communicates system power mode to all modules on class 2 serial data line. DTC B1805 will store when one of 4 monitored ignition switch circuits has malfunctioned. When DTC is stored, DIM used default readings for each ignition switch position when faults exists. A current DTC clears when malfunction no longer exists. A history DTC clears when module ignition cycle counter reaches reset threshold without a repeat of malfunction.

The following must occur for DTC to run

  1. One of 4 monitored ignition switch circuits have malfunctioned.
  1. If diagnostic system check for system exhibiting symptom has been performed, go to next step. If diagnostic system check for system exhibiting symptom has not been performed, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to OFF position. Using scan tool, observe ignition switch parameters in Dash Integration Module (DIM) data list. If all ignition switch parameters display as inactive, go to next step. If all ignition switch parameters do not display as inactive, go to step 7.
  3. Turn ignition switch to RUN position. Using scan tool, observe ignition switch parameters. If all ignition switch parameters display as active, go to next step. If all ignition switch parameters do not display as active, go to step 9.
  4. Turn ignition switch to START position. Using scan tool, observe ignition switch parameters. If only run/crank and ignition unlock parameters display as active, go to next step. If only run/crank and ignition unlock parameters do not display as active, go to step 7.
  5. Turn ignition switch to OFF position. Ensure ignition key is still in ignition switch. Using scan tool, observe ignition switch parameters. If only ignition unlock parameter displays as active, go to next step. If only ignition unlock parameter does not display as active, go to step 7.
  6. Turn ignition switch to ACCY position. Using scan tool, observe ignition switch parameters. If only ignition accessory parameter does not display as active, go to next step. If only ignition accessory parameter displays as ACTIVE, go to step 11.
  7. Turn ignition switch to OFF position. Disconnect ignition switch harness connector. Using scan tool, observe ignition switch parameters. If previously active state does not change to inactive, go to next step. If previously active state changes to inactive, go to step 10.
  8. Inspect active power mode signal circuits for short to voltage between ignition switch harness connectors and DIM harness connector C1. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to step 11. If problem exists, repair active power mode signal circuits as necessary. After repair, go to step 14.
  9. Inspect inactive power mode signal circuits for an open or high resistance between ignition switch harness connectors and DIM harness connector C1. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to step 11. If problem exists, repair inactive power mode signal circuits as necessary. After repair, go to step 14.
  10. Inspect ignition switch harness connector for poor connections. If problem does not exist, go to step 12. If problem exists, repair ignition switch harness connector as necessary. After repair, go to step 14.
  11. Inspect DIM harness connector for poor connections. If problem does not exist, go to step 13. If problem exists, repair DIM harness connector as necessary. After repair, go to step 14.
  12. Replace ignition switch. After repair, go to step 14.
  13. Replace DIM. Program DIM. See «DASH INTEGRATION MODULE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under PROGRAMMING. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

Serial data circuit is used to communicate information between systems. Each system on serial data line is assigned its own identification number, which is used to identify which module or system is communicating. Systems periodically send a State of Health (SOH) message to other systems. If those systems fail to send an SOH message back, a corresponding DTC will store. Any system that cannot communicate properly will store corresponding DTC. DTC U1000 or U1255 will store when a module or system does not associate an identification number with a SOH message within 5 seconds. A current DTC clears when malfunction no longer exists. A history DTC clears when module ignition cycle counter reaches reset threshold without a repeat of malfunction.

The following must occur for DTC to run

  1. At least one critical operating parameter has not been associated with an identification number within 5 seconds after beginning serial data communication.
  2. DTCs B1327, B1328, B1982, B1983, U1300, U1301 and U1305 do not have a current status.
  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Using scan tool, retrieve DTCs. If DTCs U1001-U1254 are not retrieved as history, go to next step. If DTCs U1001-U1254 are retrieved as history, repair those DTCs first. Perform «DTC U1001-U1254: LOSS OF XXX COMMUNICATION»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with each module on class 2 serial data circuit. See «CLASS 2 SERIAL DATA LINE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__class-2-serial-data-line) under DESCRIPTION & OPERATION. Record all modules communicating on class 2 serial data circuit. If any modules on class 2 serial data circuit do not communicate, go to next step. If aLL modules on class 2 serial data circuit communicate, go to step 12.
  3. Inspect battery voltage, ignition voltage input and output circuits for an open or short to ground for moduleS not communicating. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair battery voltage, ignition voltage input and/or output circuits as necessary. After repair, go to step 8.
  4. Turn ignition switch to OFF position. Inspect ground circuits for an open for moduleS not communicating. See GROUND DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair ground circuits as necessary. After repair, go to step 8.
  5. Inspect Purple wire for an open for module not communicating. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair Purple wire as necessary. After repair, go to step 8.
  6. Inspect suspect module harness connector for poor connections and terminal tension for battery voltage, class 2 serial data, ground, ignition voltage input and ignition voltage output circuits. If problem does not exist, go to next step. If problem exists, repair suspect module harness connector as necessary. After repair, go to step 8.
  7. Replace module which was not communicating. Program module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to step 10.
  8. Connect scan tool to DLC. Turn ignition switch to RUN position. Using scan tool, select DISPLAY DTCs function for module which was not communicating. If scan tool does not display any DTCs which do not begin with "U", go to next step. If scan tool displays any DTCs which do not begin with "U", perform appropriate diagnostic system check to diagnose DTCs. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  9. Using scan tool, clear DTCs, then go to next step.
  10. Using scan tool, select DISPLAY DTCs function for module(s) which stored U1000 or U1255 as current. If scan tool does not display DTCs which do not begin with "U", go to next step. If scan tool displays DTCs which do not begin with "U", perform appropriate diagnostic system check to diagnose DTCs. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  11. Using scan tool, clear DTCs. System is okay at this time.
  12. If no other DTCs for modules which stored U1000 or U1255 as current, go to next step. If other DTCs for module which stored U1000 or U1255 as current, perform appropriate diagnostic system check to diagnose DTCs. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  13. Using scan tool, clear DTCs. Turn ignition switch to OFF position for 5 seconds. Turn ignition switch to RUN position. Using scan tool, select DISPLAY DTCs function. If scan tool displays DTC U1000 or U1255 as current, go to next step. If scan tool does not display DTC U1000 or U1255 as current, see «DIAGNOSTIC AIDS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  14. Replace module which stored U1000 or U1255 as current. Program module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). System is okay at this time.

When a malfunction (such as a blown fuse to a module) occurs while modules are communicating, a lost communication DTC will store as current. When modules stop communicating (ignition OFF), current lost communication DTC will be cleared but history DTC will remain. When modules begin to communicate again, module with blown fuse will not be learned by other modules so DTC U1000 or U1255 will be set as current by other modules. If malfunction occurs when modules are not communicating, only U1000 or U1255 will store.

Modules connected along class 2 serial data line monitor serial data communications during normal vehicle operation. Operating information and commands are exchanged between modules and operating systems. When a module receives a State Of Health (SOH) message from another system, that module records identification number of system which sent SOH message. If SOH is not received, receiving module must use a default value for non-transmitting module. Once an identification number is learned by a module, it will monitor that system for its unique SOH message. Each system on class 2 serial data line must send a SOH message every 2 seconds. When no message is detected from any system for 5 seconds, DTC U1XXX (XXX is equal to a 3 digit identification number) will store. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION NUMBER table to determine which system is not communicating. For example, if DTC U1016 is stored, Powertrain Control Module (PCM) is not communicating. A current DTC clears when malfunction no longer exists. A history DTC clears when module ignition cycle counter reaches reset threshold without a repeat of malfunction.

ID NumberModule Not Communicating
016Powertrain Control Module
040Electronic Brake Control Module
056Continuously Variable Road Sensing Suspension Module
064Dash Integration Module
065Instrument Panel Module
066Rear Integration Module
088Sensing & Diagnostic Module
096Instrument Panel Cluster
128Radio
129Radio Amplifier
144Cellular Telephone Module
145Navigation Data Processor
151Vehicle Interface Unit
176Remote Control Door Lock Receiver
192Theft Deterrent Module

DIAGNOSTIC TROUBLE CODE IDENTIFICATION NUMBER

The following must occur for DTC to run

  1. DTCs B1327, B1328, B1982, B1983, U1300, U1301 or U1305 does not have current status.
  2. Message from a learned identification number has not been detected for 5 seconds.
  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Using scan tool record DTCs. If DTC U1161, U1161, U1163 or U1170 are not retrieved, go to next step. If DTC U1161, U1161, U1163 or U1170 are retrieved, perform «DTC U1161-U1163 OR U1170: DRIVER'S DOOR MODULE COMMUNICATION MALFUNCTION»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  2. Inspect battery or ignition supply voltage circuit to module identified as not communicating for an open. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair battery or ignition supply voltage circuit(s) as necessary. After repair, go to step 10.
  3. Turn ignition switch to OFF position. Inspect ground circuits of module identified as not communicating for an open. See GROUND DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair ground circuits as necessary. After repair, go to step 10.
  4. Inspect harness connector of module identified as not communicating for poor connections at battery supply, ignition supply, ground and serial data line terminals. If problem does not exist, go to next step. If problem exists, repair harness connector as necessary. After repair, go to step 10.
  5. Verify that all modules communicate with scan tool. For list of modules, see «CLASS 2 SERIAL DATA LINE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__class-2-serial-data-line) under DESCRIPTION & OPERATION. If any module does not communicate with scan tool, go to next step. If all modules communicate with scan tool, go to step 7.
  6. Inspect Purple wire for an open for module not communicating. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair Purple wire as necessary. After repair, go to step 8.
  7. Replace module not communicating. Program module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repairs, go to step 10.
  8. Connect scan tool to DLC. Turn ignition switch to RUN position. Using scan tool, select DISPLAY DTCs for module identified as not communicating. If scan tool does not display any DTCs which do not begin with "U", go to next step. If scan tool displays any DTCs which do not begin with "U", perform appropriate diagnostic system check to diagnose DTC. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  9. Using scan tool, clear DTCs, then go to next step.
  10. Using scan tool, select DISPLAY DTCs for module identified as not communicating. If scan tool does not display any DTCs which do not begin with "U", go to next step. If scan tool displays any DTCs which do not begin with "U", perform appropriate diagnostic system check to diagnose DTC. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  11. Using scan tool, clear DTCs. Continue diagnosing or clearing DTCs until all modules have been diagnosed. System is okay at this time.

When multiple loss of communication DTCs are stored concurrently, cause is likely to be 2 opens in class 2 serial data circuit. Use DTC ID number list in order to determine which modules are not communicating. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION NUMBER table. See DATA LINK CONNECTORS article in WIRING DIAGRAMS to determine location of opens.

Power door serial data circuit provides a means for information exchange among vehicle door modules. Door module information on inputs and commanded outputs is converted to serial data and sent out on power door serial data line for exchange among door modules. Driver's Door Module (DDM) also communicates with other vehicle modules through class 2 serial data circuit and sends class 2 serial data information and relays through power door serial data line, to other door modules. Vehicle power mode message (ignition switch position) from Dash Integration Module (DIM) is an example of class 2 communications between DDM and other vehicle modules. DDM periodically addresses each door module on power door serial data circuit. When a door module does not respond to DDM, DTC for that module is stored. A current DTC will clear when a response message from failed door module is detected or at end of current ignition cycle. A history DTC will clear upon receipt of a scan tool clear DTCs command, or after 50 OFF/RUN ignition switch cycles, without a repeat of communications failure.

The following must occur for DTC to run

  1. DTCs B1327, B1328, U1300 and U1301 do not have a current status.
  2. Driver's Door Module (DDM) has power.
  3. DDM has received an input, a power door serial data message, or a class 2 "wake up" message.
  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Using scan tool, retrieve DTCs. If DTCs U1161, U1162, U1163 and U1170 are not retrieved with a current status, go to next step. If DTCs U1161, U1162, U1163 and U1170 are retrieved with a current status, go to step 9.
  2. If DTCs U1161, U1162 and U1163 are not retrieved with a current status and U1170 was not retrieved, go to next step. If DTCs U1161, U1162 and U1163 are retrieved with a current status and U1170 was not retrieved, go to step 4.
  3. If either DTCs U1161, U1162, U1163 or U1170 are retrieved by itself, or DTCs U1162 and U1163 together with a current status, go to step 5. If either DTCs U1161, U1162, U1163 or U1170 are not retrieved by itself, or DTCs U1162 and U1163 are not together with a current status, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  4. Inspect Tan/White wire for an open between Driver's Door Module (DDM) harness connector C1 terminal No. 15 and wiring splice. (Scheme 16) Wiring splice is located in body harness, approximately 5.5" from 18-pin seat harness connector breakout. If problem does not exist, go to step 16. If problem exists, repair Tan/White wire as necessary. After repair, go to step 22.
  5. Inspect battery voltage circuit for an open or short to ground between DDM and door modules that are not communicating. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair battery voltage circuit as necessary. After repair, go to step 22.
  6. Inspect Orange wire for a short to ground between suspect door module that is not communicating and associated power window sensor. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exist, repair Orange wire as necessary. After repair, go to step 22.
  7. Turn ignition switch to OFF position. Inspect Black/White wire for an open between ground and suspect door module that is not communicating. See GROUND DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair Black/White wire as necessary. After repair, go to step 22.
  8. Inspect Tan/White wire for an open between suspect door module that is not communicating and wiring splice. Wiring splice is located in body harness, approximately 5.5" from 18-pin seat harness connector breakout. If problem does not exist, go to step 17. If problem exists, repair Tan/White wire as necessary. After repair, go to step 22.
  9. Turn ignition switch to OFF position. Disconnect DDM 20-pin harness connector C1. Inspect Tan/White wire for a short to ground or short to voltage between DDM harness connector C1 terminal No. 15 and DDSA harness connector terminal No. 10. (Scheme 16) Turn ignition switch to RUN position for short to voltage test. If problem does not exist, go to next step. If problem exists, repair Tan/White wire as necessary. After repair, go to step 22.
  10. Turn ignition switch to OFF position. Disconnect Passenger's Door Module (PDM), Left Rear Door Module (LRDM) and Right Rear Door Module (RRDM) both are 20-pin harness connectors. Inspect power door serial data circuit (Tan/White wire) for a short to ground or short to voltage between each module. Turn ignition switch to RUN position for short to voltage test. If problem does not exist, go to next step. If problem exists, repair Tan/White wire as necessary. After repair, go to step 22.
  11. Turn ignition switch to OFF position. Connect DDM harness connector C1. Connect scan tool to DLC. Turn ignition switch to RUN position. Using scan tool, select SPECIAL FUNCTIONS for DDM. Using scan tool, operate driver's power window and power door lock. If power window or door lock operates correctly, go to next step. If power window or door lock does not operate correctly, go to step 16.
  12. Turn ignition switch to OFF position. Connect DDSA harness connector. Turn ignition switch to RUN position. Using DDSA, operate driver's power window and power door lock. If power window or door lock operates correctly, go to next step. If power window or door lock does not operate correctly, go to step 18.
  13. Turn ignition switch to OFF position. Connect PDM harness connector. Turn ignition switch to RUN position. Using DDSA, operate passenger's power window. If power window operates correctly, go to next step. If power window does not operate correctly, go to step 17.
  14. Turn ignition switch to OFF position. Connect LRDM. Turn ignition switch to RUN position. Operate left rear power window using DDSA. If power window operates correctly, go to next step. If power window does not operate correctly, go to step 17.
  15. Turn ignition switch to OFF position. Connect RRDM. Turn ignition switch to RUN position. Operate right rear power window using DDSA. If power window operates correctly, go to next step. If power window does not operate correctly, go to step 17.
  16. Inspect DDM harness connector for poor connections. If problem does not exist, go to step 19. If problem exists, repair DDM harness connector as necessary. After repair, go to step 22.
  17. Inspect harness connector of module that is not communicating for poor connections. If problem does not exist, go to step 20. If problem exists, repair suspect harness connector as necessary. After repair, go to step 22.
  18. Inspect DDSA harness connector for poor connections. If problem does not exist, go to step 21. If problem exists, repair DDSA harness connector as necessary. After repair, go to step 22.
  19. Replace DDM. Program DDM. See «WINDOW MOTOR PROGRAMMING - EXPRESS MODE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__window-motor-programming-express-mode) under PROGRAMMING. After repair, go to step 22.
  20. Replace suspect door module. Program suspect door module. See «WINDOW MOTOR PROGRAMMING - EXPRESS MODE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__window-motor-programming-express-mode) under PROGRAMMING. After repair, go to step 22.
  21. Replace DDSA. After repair, go to next step.
  22. Using scan tool, clear DTCs. Perform «DOOR SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__door-systems-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

Scheme 16

Scheme 16
Scheme 16

Loss of communications with an individual module may be due to an unpowered module. This includes Driver's Door Switch Assembly (DDSA). Rear door modules each have a separate battery voltage circuit, and are both fed by same RRDR MDL 10-amp fuse, located in rear fuse block. A short to ground in either one of rear door module battery voltage circuits may blow fuse and cause DTCs U1162 and U1163 to be simultaneously stored as current.

Class 2 serial data line is used to communicate information between modules. Each module connected to serial data line is assigned its own recognition code (address). This DTC is used to identify which modules are communicating. Modules communicate with each other by periodically sending State Of Health (SOH) messages. When ignition switch is in RUN position, each module communicating on serial data line sends a SOH message every 2 seconds to ensure that system is operating properly. This module monitors serial data line for a short to ground. If module detects a short to ground for longer than 3 seconds, no communication will be established between this module and other modules, causing DTC U1300 to be stored. A current DTC will clear when a valid class 2 message is detected on class 2 serial data circuit, or at end of current ignition cycle. A history DTC clears after 50 consecutive ignition cycles without a repeat of malfunction.

The following must occur for DTC to run

  1. No valid messages are detected on class 2 serial data circuit.
  2. Voltage level detected on class 2 serial data circuit is low.

DTC U1300 cannot be retrieved with a current status. Diagnosis of U1300 is accomplished by performing TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH A CLASS 2 DEVICE under SYSTEM TESTS. An intermittent condition is likely to be caused by a short to ground on class 2 serial data line.

Modules connected to class 2 serial data circuit, monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among modules. In addition to this, node alive messages are transmitted by each module on class 2 serial data circuit approximately once very 2 seconds. When a module detects no messages and a high voltage on class 2 serial data circuit for 3 seconds, U1301 is stored and storage of all other class 2 serial communication DTCs is inhibited. A current DTC will clear when a valid class 2 message is detected on class 2 serial data circuit, or at end of current ignition cycle. A history DTC clears after 50 consecutive ignition cycles without a repeat of malfunction.

The following must occur for DTC to run

  1. No valid messages are detected on class 2 serial data circuit.
  2. Voltage level detected on class 2 serial data circuit is high.

DTC U1301 cannot be retrieved with a current status. Diagnosis of U1301 is accomplished by performing TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH A CLASS 2 DEVICE under SYSTEM TESTS. An intermittent condition is likely to be caused by a short to voltage on class 2 serial data line.

Modules connected to class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among modules. In addition to this, node alive messages are transmitted by each module on class 2 serial data circuit once every 2 seconds. When a module detects class 2 serial data circuit shorted, storing of all other class 2 serial communication DTCs is inhibited and a U1300, U1301, or a U1305 DTC will be stored. Module uses default values for all parameters received on class 2 serial data circuit. A current DTC clears when malfunction no longer exists. A history DTC clears when module ignition cycle counter reaches reset threshold, without a repeat of malfunction.

The following must occur for DTC to run

  1. No valid class 2 messages are detected on class 2 serial data circuit.
  2. Class 2 serial data circuit is short to ground or voltage.

DTC U1305 cannot be retrieved with a current status. Diagnosis of U1305 is accomplished by performing TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH A CLASS 2 DEVICE under SYSTEM TESTS. An intermittent condition is likely to be caused by a short to ground or voltage on class 2 serial data line.

Vehicle Communication Unit (VCU) and Vehicle Interface Unit (VIU) communicate using OnStar(R) Serial Data (-) circuit, OnStar(R) Serial Data (+) circuit and OnStar(R) serial data return circuit. DTC U1500 is stored when VIU detects no communication between VIU and VCU. When DTC U1500 is stored, VIU does not communicate with VCU, no phone calls can be placed, and OnStar(R) status LED turns Red. A history DTC clears after 50 consecutive ignition cycles, or VIU receives a clear DTC command from scan tool.

The following must occur for DTC to run

  1. Ignition switch must be in RUN or ACC positions.
  2. System voltage is at least 9.5 volts and no more than 15.5 volts.
  3. All above conditions exist for 300 milliseconds or more.
  1. If cellular communication diagnostic system check has been performed, go to next step. If cellular communication diagnostic system check has not been performed, perform «CELLULAR COMMUNICATION DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__cellular-communication-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect Vehicle Communication Unit (VCU) 25-pin harness connector. VCU is located behind rear seat. (Scheme 12) Turn ignition switch to RUN position. Measure voltage between ground and VCU harness connector terminal No. 18 (Tan/Black wire). (Scheme 17) Voltage should be 0.2 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 5.
  3. Measure voltage between ground and VCU harness connector terminal No. 12 (White wire). Voltage should be 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 6.
  4. Measure voltage between ground and VCU terminal No. 4 (Orange wire). Voltage should be 12 volts. If voltage is not as specified, go to step 7. If voltage is as specified, go to step 8.
  5. Inspect Tan/Black wire for a short to ground between ground and VCU harness connector terminal No. 18. (Scheme 17) If problem does not exist, go to step 9. If problem exists, repair Tan/Black wire as necessary. After repair, go to step 12.
  6. Inspect White wire for an open or short to voltage between VCU harness connector terminal No. 12 and Vehicle Interface Unit (VIU) harness connector C1 terminal B12. (Scheme 17)and (Scheme 18). If problem does not exist, go to step 9. If problem exists, repair White wire as necessary. After repair, go to step 12.
  7. Inspect Orange wire for an open or short to ground between rear fuse block and VCU harness connector terminal No. 4. If problem does not exist, go to step 9. If problem exists, repair Orange wire as necessary. After repair, go to step 12.
  8. Inspect VCU harness connector for poor connections. If problem does not exist, go to step 10. If problem exists, repair VCU harness connector as necessary. After repair, go to step 12.
  9. Inspect VIU harness connector for poor connections. If problem does not exist, go to step 11. If problem exists, repair VIU harness connector as necessary. After repair, go to step 12.
  10. Replace VCU. Program VCU. See «VEHICLE COMMUNICATION UNIT/VEHICLE INTERFACE UNIT (ONSTAR(R))»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__vehicle-communication-unitvehicle-interface-unit-onstarr) under PROGRAMMING. After repair, go to step 12.
  11. Replace VIU. Program VIU. See «VEHICLE COMMUNICATION UNIT/VEHICLE INTERFACE UNIT (ONSTAR(R))»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__vehicle-communication-unitvehicle-interface-unit-onstarr) under PROGRAMMING. After repair, go to next step.
  12. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules). If DTC resets, repeat test beginning at step 2.

Scheme 17

Scheme 17
Scheme 17

Scheme 18

Scheme 18
Scheme 18

Express up operation of front door power windows is monitored and controlled by front door modules and window sensors. Each front door window motor has a window sensor mounted to it. Driver's Door Module (DDM) and Passenger's Door Module (PDM) each supply battery voltage and ground to power their respective window sensors. Door modules and sensors communicate with each other through a window sensor high speed communications circuit, and a window sensor normal speed communications circuit. Window sensor detects differences in window motors electrical pulses to determine if there is an obstruction to travel of window glass. Door modules use information generated by sensors to disable express up movement of a window, or reverse direction of travel, in event that a passenger, or other obstacle, has become trapped in it. A window sensor high speed communications circuit is a unique one-way communications link between sensor and door module. Sensor uses a voltage signal, and a one kHz signal, to transmit information, through this circuit, from sensor to door module. Door module must have power and cannot have B1327 or B1328 stored. If failure has occurred to passenger's window, PDM relays information to DDM, and stores DTC. DDM or PDM will not allow express up function for window to operate. All other window functions will operate. DDM will clear a current DTC when, DDM or PDM detects a window sensor high speed communications circuit voltage is no longer low while window is not moving.

The following must occur for DTC to run

  1. Window sensor high speed communications circuit voltage is a constant low for 112 milliseconds, while window is not moving.
  2. Window sensor high speed communications circuit one kHz signal is active for 112 milliseconds, while window is not moving.
  1. If door systems diagnostic system check has been performed, go to next step. If door systems diagnostic system check has not been performed, perform «DOOR SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__door-systems-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Disconnect suspect window motor harness connector. Turn ignition switch to RUN position. Measure voltage between ground and suspect window motor harness connector terminal "D" (Light Green wire). See appropriate wiring diagram in POWER WINDOWS - SEVILLE article. Voltage should be 7-9.25 volts. If voltage is not as specified, go to next step. If voltage is as specified, go to step 5 .
  3. Inspect Light Green wire for a short to ground between appropriate door module harness connector and suspect window motor harness connector terminal "D". If problem does not exist, go to next step. If problem exists, repair Light Green wire as necessary. After repair, go to step 8 .
  4. Inspect suspect door module harness connector for poor connections. If problem does not exist, go to step 6 . If problem exists, repair suspect door module harness connector as necessary. After repair, go to step 8 .
  5. Inspect suspect window motor harness connector for poor connections. If problem does not exist, go to next step. If problem exists, repair suspect window motor harness connector as necessary. After repair, go to step 8 .
  6. Replace suspect door module. Program suspect door module. See «WINDOW MOTOR PROGRAMMING - EXPRESS MODE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__window-motor-programming-express-mode) under PROGRAMMING. After repair, go to step 8 .
  7. Replace suspect window motor assembly. Program appropriate door module. See «WINDOW MOTOR PROGRAMMING - EXPRESS MODE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__window-motor-programming-express-mode) under PROGRAMMING. After repair, go to next step.
  8. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) . If DTC resets, repeat test beginning at step 2 .

When DTC U1713 or U1715 are stored, a failure of window sensor high speed communications circuit is probable cause.

Express up operation of front door power windows is monitored and controlled by front door modules and window sensors. Each front door window motor has a window sensor mounted to it. Driver's Door Module (DDM) and Passenger's Door Module (PDM) each supply battery voltage and ground to power their respective window sensors. Door modules and sensors communicate with each other through a window sensor high speed communications circuit, and a window sensor normal speed communications circuit. Window sensor detects differences in window motor electrical pulses to determine if there is an obstruction to travel of window glass. Door modules use information generated by sensors to disable express up movement of a window, or reverse direction of travel, in event that a passenger, or other obstacle has become trapped in it. Window sensor normal speed circuit is a unique two-way serial data communications link between door module and sensor. State-Of-Health (SOH) messages, window switch command status, and actual position of window glass in relationship to distance traveled by window, are communicated through this circuit. Door modules must have power and cannot have B1327 or B1328 stored. DDM or PDM will not allow express up function for window to operate. All other window functions for window will operate. DDM will clear a current DTC when window sensor normal speed communications between DDM and sensor, or PDM and sensor have returned to normal.

The following must occur for DTC to run

  1. Door module must have power and DTC B1327 or B1328 cannot be stored.
  2. Window sensor normal speed communications line is short to voltage.
  1. If door systems diagnostic system check has been performed, go to next step. If door systems diagnostic system check has not been performed, perform «DOOR SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__door-systems-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect suspect window motor harness connector. Turn ignition switch to RUN position. Measure voltage between suspect window motor harness connector terminals "B" (White wire) and "F" (Black wire). Voltage should be 9.5-16 volts. If voltage is not as specified, go to next step. If voltage is as specified, go to step 4.
  3. Measure voltage between ground and suspect window motor harness connector terminal "F" (Black wire). Voltage should be 9.5-16 volts. If voltage is not as specified, go to step 8. If voltage is as specified, go to step 9.
  4. Measure voltage between ground and suspect window motor harness connector terminal "E" (Pink wire). Voltage should be 7.5-9.5 volts. If voltage is not as specified, go to next step. If voltage is as specified, go to step 11.
  5. If voltage measured in step 4) was less than specified voltage, go to next step. If voltage measure in step 4) was greater than specified voltage, go to step 7.
  6. Inspect Pink wire for an open, high resistance or short to ground between suspect window motor harness connector terminal "E" and appropriate door module harness connector terminal No. 17. (Scheme 16) If problem does not exist, go to step 10. If problem exists, repair Pink wire as necessary. After repair, go to step 14.
  7. Inspect Pink wire for a short to voltage between suspect window motor harness connector terminal "E" and appropriate door module harness connector terminal No. 17. (Scheme 16) If problem does not exist, go to step 10. If problem exists, repair Pink wire as necessary. After repair, go to step 14.
  8. Inspect Black wire for an open, high resistance or short to ground between suspect window motor harness connector "F" and appropriate door module harness connector terminal No. 16. (Scheme 16) If problem does not exist, go to step 10. If problem exists, repair Black wire as necessary. After repair, go to step 14.
  9. Inspect White wire for an open, high resistance or short to voltage between suspect window motor harness connector terminal "B" and appropriate door module harness connector terminal No. 19. (Scheme 16) If problem does not exist, go to next step. If problem exists, repair White wire as necessary. After repair, go to step 14.
  10. Inspect suspect door module harness connector for poor connections. If problem does not exist, go to step 12. If problem exists, repair suspect door module harness connector as necessary. After repair, go to step 14.
  11. Inspect suspect window motor harness connector for poor connections. If problem does not exist, go to step 13. If problem exists, repair suspect window motor harness connector as necessary. After repair, go to step 14.
  12. Replace suspect door module. Program suspect door module. See «WINDOW MOTOR PROGRAMMING - EXPRESS MODE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__window-motor-programming-express-mode) under PROGRAMMING. After repair, go to step 14.
  13. Replace suspect window motor. Program appropriate door module. See «WINDOW MOTOR PROGRAMMING - EXPRESS MODE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__window-motor-programming-express-mode) under PROGRAMMING. After repair, go to next step.
  14. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. If DTCs resets, repeat test beginning at step 2.

When DTC U1714 or DTC U1716 are stored, a failure of window sensor normal speed communications circuit is probable cause. DTC U1714 or U1716 may also be stored if window sensor has lost power. This could be due to a failure of sensor battery voltage circuit, or a failure of sensor ground circuit.

Navigation Module (NAV) communicates with Navigation Display Head (NDH) over 2 dedicated lines. These are navigation display serial data high and low circuits. NAV does not receive a message from NDH after 3 attempts, which occurs once every 3 seconds (no communication for 9 seconds total). Display does not update of change functions or screen may become blank. Message LOSS OF COMMUNICATION WITH NAVIGATION PROCESSOR may appear on display. DTC will clear when NAV receives a response from NDH.

The following must occur for DTC to run

  1. Navigation Module (NAV) must detect a power mode transition from OFF-ASLEEP state when ignition switch is in ACC or RUN positions.
  2. DTCs B1327 or B1328 are not current.
  1. If navigation system diagnostic system check has been performed, go to next step. If navigation system diagnostic system check has not been performed, perform «NAVIGATION SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__navigation-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect Navigation Display Head (NDH) 32-pin harness connector. Turn ignition switch to RUN position. Measure voltage between ground and NDH harness connector terminals C12 (Red wire) and D12 (Brown wire), individually. (Scheme 19) Voltage should be 2-3 volts at both terminals. If voltage is not as specified, go to next step. If voltage is as specified, go to step 5.
  3. Inspect Red wire and Brown wire for an open, short to ground, short to voltage or shorted together between NDH harness connector and navigation data processor. If problem does not exist, go to next step. If problem exists, repair Red wire and/or Brown wire as necessary. After repair, go to step 8.
  4. Inspect NDH harness connector for poor connections. If problem does not exist, go to next step. If problem exists, repair NDH harness connector as necessary. After repair, go to step 8.
  5. Replace NDH, then go to step 8.
  6. Inspect NAV harness connector for poor connections. If problem does not exist, go to next step. If problem exists, repair NAV harness connector as necessary. After repair, go to step 8.
  7. Replace NAV, then go to next step.
  8. Using scan tool, clear DTCs. Turn ignition switch to OFF position. Disconnect scan tool. Open and close driver's door to cancel retained accessory power mode. DO NOT operate any system for 2 minutes. Turn ignition switch to RUN position. Wait 20 seconds, then connect scan tool. Using scan tool, retrieve DTCs. If DTC resets, repeat test beginning at step 2.

Scheme 19

Scheme 19
Scheme 19

Inspect navigation display serial data high and low circuits for intermittents. Inspect Navigation Module (NAV) supply and ground circuits. See appropriate NAVIGATION SYSTEMS article.

Navigation display head (NDH) communicates with Navigation Module (NAV) over 2 dedicated lines. These are navigation display serial data high and low circuits. DTC will store when NDH does not receive a command from NAV after 15 seconds. When DTC is stored, display does not update or change function or screen may become blank. A message of LOSS OF COMMUNICATION WITH NAVIGATION PROCESSOR may appear on display. DTC will clear when NDH receives a response from NAV.

The following must occur for DTC to run

  1. Navigation Module (NAV) must detect a power mode transition from OFF-ASLEEP state when ignition switch is in ACC or RUN positions.
  2. DTCs B1327 or B1328 are not current.
  1. If navigation system diagnostic system check has been performed, go to next step. If navigation system diagnostic system check has not been performed, perform «NAVIGATION SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__navigation-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect Navigation Display Head (NDH) 32-pin harness connector. NDH is located in overhead console. Turn ignition switch to RUN position. Measure voltage between ground and NDH harness connector terminals C12 (Red wire) and D12 (Brown wire), individually. (Scheme 19) Ignoring polarity, voltage should be 2-3 volts at both terminals. If voltage is not as specified, go to next step. If voltage is as specified, go to step 6.
  3. Inspect Red wire and Brown wire for an open, short to ground, short to voltage or shorted together between NDH harness connector and navigation data processor. If problem does not exist, go to next step. If problem exists, repair Red wire and/or Brown wire as necessary. After repair, go to step 8.
  4. Inspect Navigation Module (NAV) harness connector for poor connections. If problem does not exist, go to next step. If problem exists, repair NAV harness connector as necessary. After repair, go to step 8.
  5. Replace NAV, then go to step 8.
  6. Inspect NDH harness connector for poor connections. If problem does not exist, go to next step. If problem exists, repair NDH harness connector as necessary. After repair, go to step 8.
  7. Replace NDH, then go to next step.
  8. Using scan tool, clear DTCs. Turn ignition switch to OFF position. Disconnect scan tool. Open and close driver's door to cancel retained accessory power mode. DO NOT operate any system for 2 minutes. Turn ignition switch to RUN position. Wait 20 seconds, then connect scan tool. Using scan tool, retrieve DTCs. If DTC resets, repeat test beginning at step 2.

Inspect navigation display serial data high and low circuits for intermittents. Inspect Navigation Module (NAV) power supply and ground circuits. See appropriate NAVIGATION SYSTEMS article.

VICS circuit board installed in Navigation Module (NAV) and communicates with main circuit board in NAV over a dedicated connection within NAV case. This DTC indicates an internal fault inside NAV case. DTC will store when there is no response from VICS processor when queried by NAV, after successfully initializing system. When DTC is stored, VICS switch disappears from navigation system menu. DTC will clear when NAV receives a response from VICS processor.

The following must occur for DTC to run

  1. Vehicle must be equipped with VICS.
  2. Navigation Module (NAV) must detect a power mode transition from OFF-ASLEEP state when ignition switch is in ACC or RUN positions.
  3. DTCs B1327 or B1328 are not current.
  1. If navigation system diagnostic system check has been performed, go to next step. If navigation system diagnostic system check has not been performed, perform «NAVIGATION SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__navigation-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Remove Navigation Module (NAV). Inspect installation of dealer installed VICS circuit board. Install NAV. Using scan tool, clear DTCs. Turn ignition switch to RUN position. Using scan tool, retrieve DTCs. If DTC resets, go to next step. If DTC does not reset, go to step 4 .
  3. Replace NAV, then go to next step.
  4. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. If DTC resets, repeat test beginning at step 2 .

SYSTEM TESTS

SymptomPerform Test
Scan Tool Does Not Power UpA
Scan Tool Does Not Communicate With Class 2 DeviceB
Power Mode MismatchC

SYMPTOM INDEX

TEST A: SCAN TOOL DOES NOT POWER UP

  1. Inspect Orange wire for an open or short to ground between underhood fuse block and Data Link Connector (DLC) terminal No. 16. Underhood fuse block is located on right side of engine compartment. DLC is located below left side of instrument panel, near steering column. (Scheme 3) See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair Orange wire as necessary. After repair, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  2. Inspect Black wire for an open or high resistance between ground and DLC terminal No. 4. Ground point is located on right front corner of passenger compartment, below sill trim plate. See GROUND DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair Black wire as necessary. After repair, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  3. Inspect DLC for poor connections and terminal tension. If problem does not exist, go to next step. If problem exists, repair DLC as necessary. After repair, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  4. Ensure scan tool is not malfunctioning. Refer to scan tool manufacturer's instructions. If scan tool is operating correctly, or a proper operating scan tool has been obtained, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.

TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) If scan tool powers up, go to next step. If scan tool does not power up, perform «TEST A: SCAN TOOL DOES NOT POWER UP»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__test-a-scan-tool-does-not).
  2. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with each module on class 2 serial data circuit. See «CLASS 2 SERIAL DATA LINE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__class-2-serial-data-line) under DESCRIPTION & OPERATION. If scan tool communicates with any module, go to next step. If scan tool does not communicate with any module, go to step 8.
  3. Using scan tool, select DISPLAY DTCs function for each module. Record all DTCs, status and module which stored DTC. If any DTCs within U1000 or U1305 are retrieved, go to next step. If any DTCs within U1000 to U1305 are not retrieved, go to step 7.
  4. If DTCs U1300, U1301 or U1305 are retrieved from any module, go to next step. If DTCs U1300, U1301 or U1305 are not retrieved from any module, go to step 6.
  5. Inspect Purple wire for an intermittent short to ground or short to voltage between DLC and suspect module. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair Purple wire as necessary. After repair, go to step 18.
  6. If DTC U1000 and U1255 are displayed, perform «DTC U1000 & U1255: CLASS 2 COMMUNICATION MALFUNCTION»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under DIAGNOSTIC TESTS. If DTC U1001-U1255 is displayed, perform «DTC U1001-U1254: LOSS OF XXX COMMUNICATION»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under DIAGNOSTIC TESTS.
  7. Diagnose non-communicating module by performing «DTC U1001-U1254: LOSS OF XXX COMMUNICATION»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under DIAGNOSTIC TESTS. After repair procedure has been complete, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  8. Turn ignition switch to OFF position. Disconnect scan tool from DLC. Inspect DLC for poor connections and terminal tension. If problem does not exist, go to next step. If problem exists, repair DLC as necessary. After repair, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  9. Inspect ground circuits for an open or high resistance between ground and DLC terminals No. 4 (Black wire) and 5 (Black/White wire), individually. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair Black wire and/or Black/White wire as necessary. After repair, perform appropriate diagnostic system check for suspect system. See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  10. Inspect Purple wire for an open, high resistance, short to ground or short to voltage between DLC terminal No. 2 and Dash Integration Module (DIM) harness connector C2 terminal A12 and Instrument Panel Module (IPM) harness connector C1 terminal C8, individually. See appropriate DATA LINK CONNECTORS article. If problem does not exist, go to next step. If problem exists, repair Purple wire as necessary. After repair, perform appropriate diagnostic system check for suspect system. See «DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) table under SELF-DIAGNOSTIC SYSTEM.See «BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__body-control-system-diagnostic-system-check) under SELF-DIAGNOSTIC SYSTEM.
  11. Turn ignition switch to OFF position. Split class 2 serial data circuit in half by disconnecting 2 module harness connectors, to help isolate location of fault. DLC must remain connected to at least one module. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with modules still connected to DLC. If scan tool does not communicate with any remaining modules, go to next step. If scan tool communicates with any remaining module, go to step 13.
  12. Turn ignition switch to OFF position. Disconnect furthest module from DLC which is still connected to class 2 serial data circuit. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with any module still connected to DLC. Continue this procedure until all modules are communicating. If scan tool does not communicate with modules, go to next step. If scan tool communicates with modules, go to step 15.
  13. Turn ignition switch to OFF position. Disconnect furthest module from DLC still connected to class 2 serial data circuit. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with any module still connected to DLC. If scan tool does not communicate with any module, go to next step. If scan tool communicates with any modules, go to step 18.
  14. Repair class 2 serial data circuits and in-line harness connectors to last module connected in branch being diagnosed. After repair, go to step 18.
  15. Inspect Purple wire for a short to ground or short to voltage between DLC and last module disconnected. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. Turn ignition switch to RUN position to test for short to voltage. If problem does not exist, go to next step. If problem exists, repair Purple wire as necessary. After repair, go to step 18.
  16. Inspect harness connector of last module disconnected for poor connections and terminal tension. If problem does not exist, go to next step. If problem exists, repair suspect harness connector as necessary. After repair, go to step 18.
  17. Replace suspect module which was last disconnected. Program suspect module, if necessary. See «PROGRAMMING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__programming). After repair, go to next step.
  18. Connect all modules. Connect scan tool to DLC. Turn ignition switch to RUN position, and wait 10 seconds. Using scan tool, select DISPLAY DTCs function for each module. Record all displayed DTCs, and status. If scan tool does not display any DTCs which begin with "U" and are current, go to next step. If scan tool displays any DTCs which begin with "U" and are current, go to step 20.
  19. If scan tool displays any DTCs which do not begin with "U", go to next step. If scan tool does not display any DTCs which do not begin with "U", go to step 21.
  20. Perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__diagnostic-trouble-code-definitions). After diagnosis, go to next step.
  21. If all DTCs are not diagnosed, go to step 20. If all DTCs are diagnosed, go to next step.
  22. Using scan tool, clear DTCs. System is okay at this time.

TEST C: POWER MODE MISMATCH

Note. Leave driver's door open during this test. This will disable retained accessory power mode, and eliminate this information from power mode parameter list.

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. (Scheme 3) Turn ignition switch to OFF position. Using scan tool, observe CLASS 2 POWER MODE parameter in DIAGNOSTIC CIRCUIT CHECK menu. If displayed power mode parameter matches actual ignition switch position, go to next step. If displayed power mode parameter does not match actual ignition switch position, go to step 6.
  2. Turn ignition switch to OFF position, and ensure ignition key is in ignition switch. Using scan tool, observe CLASS 2 POWER MODE parameter in DIAGNOSTIC CIRCUIT CHECK menu. If displayed power mode parameter matches actual ignition switch position, go to next step. If displayed power mode parameter does not match actual ignition switch position, go to step 6.
  3. Turn ignition switch to RUN position. Using scan tool, observe CLASS 2 POWER MODE parameter in DIAGNOSTIC CIRCUIT CHECK menu. If displayed power mode parameter matches actual ignition switch position, go to next step. If displayed power mode parameter does not match actual ignition switch position, go to step 6.
  4. Turn ignition switch to START position. Using scan tool, observe CLASS 2 POWER MODE parameter under DIAGNOSTIC CIRCUIT CHECK menu. If displayed power mode parameter matches actual ignition switch position, go to next step. If displayed power mode parameter does not match actual ignition switch position, go to step 6.
  5. Turn ignition switch to ACC position. Using scan tool, observe CLASS 2 POWER MODE parameter in DIAGNOSTIC CIRCUIT CHECK menu. If displayed power mode parameter does not match actual ignition switch position, go to next step. If displayed power mode parameter matches actual ignition switch position, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules).
  6. Turn ignition switch to OFF position. Disconnect Dash Integration Module (DIM) harness connector. DIM is located behind right side of dash, near blower motor. (Scheme 2) Turn and hold ignition switch to position that indicated incorrect power mode. Inspect for voltage by connecting a test light between ground and DIM harness connector ignition switch inputs. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If voltage exists at only inputs specified for ignition switch, go to next step. If voltage does not exist at only inputs specified for ignition switch, go to step 8.
  7. Turn and hold ignition switch to position that indicated incorrect power mode. Inspect for voltage by connecting a test light between ground and DIM harness connector ignition switch inputs. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If voltage does not exist on any inputs specified for ignition switch position, go to step 9. If voltage exists on any inputs specified for ignition switch position, go to step 11.
  8. Disconnect ignition switch harness connector. Inspect ignition switch input circuits for a short to voltage between ignition switch harness connector and DIM. Inspect ignition switch input circuits for a short between circuits. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to step 10. If problem exists, repair ignition switch input circuits as necessary. After repair, go to step 14.
  9. Disconnect ignition switch harness connector. Inspect ignition switch input circuits for an open between ignition switch and DIM. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If problem does not exist, go to next step. If problem exists, repair ignition switch input circuits as necessary. After repair, go to step 14.
  10. Inspect ignition switch harness connector for poor connections and terminal tension. If problem does not exist, go to step 12. If problem exists, repair ignition switch harness connector as necessary. After repair, go to step 14.
  11. Inspect DIM harness connector for poor connections and terminal tension. If problem does not exist, go to step 13. If problem exists, repair DIM harness connector as necessary. After repair, go to step 14.
  12. Replace ignition switch, then go to step 14.
  13. Replace DIM. Program DIM. See «DASH INTEGRATION MODULE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules) under PROGRAMMING. After repair, go to next step.
  14. Connect all disconnected components, if still disconnected. Using scan tool, observe CLASS 2 POWER MODE under DIAGNOSTIC CIRCUIT CHECK menu. Cycle ignition switch through all positions. If displayed power mode parameter does not match actual ignition switch position, repeat test beginning at step 1.

REMOVAL & INSTALLATION

WARNINGVehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article.
CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

Remove rear compartment trim panel. See REAR COMPARTMENT TRIM PANEL. Disconnect harness connector from cellular telephone module. Remove 4 screws securing cellular telephone module and bracket assembly to rear shelf trim panel. (Scheme 20) Remove cellular telephone module and mounting bracket assembly from rear shelf trim panel. Release cellular telephone module mounting bracket retaining tabs and slide module out of mounting bracket. To install, reverse removal procedure.

Scheme 20

Scheme 20: Removal & Installation
Scheme 20: Removal & Installation

Remove rear compartment trim panel. See REAR COMPARTMENT TRIM PANEL . Access rear electronics compartment. Disconnect harness connectors from Continuous Variable Road Sensing Suspension (CVRSS) module. Remove CVRSS module from right electronics bay. To install, reverse removal procedure.

Note. Before replacing Dash Integration Module (DIM), record personalization settings, to transfer into new module. See DASH INTEGRATION MODULE under PROGRAMMING.

Disconnect negative battery cable. Remove right sound insulator from under right side of dash. Disconnect DIM harness connectors. Depress locking tab inward and slide DIM downward. Remove DIM from bracket. To install, reverse removal procedure. Program DIM. See DASH INTEGRATION MODULE under PROGRAMMING.

Note. This procedure includes all door modules.

  1. Remove appropriate inside handle bezel and screw. Lift flap in pull handle opening to access and remove 2 screws. Remove 2 screws from bottom of door trim panel. Using Door Trim Pad Clip Remover (J38778), release 8 retainers from perimeter of door trim panel.
  2. Lift upward and outward on door trim panel to disengage from top of door. Disconnect door latch cable from inside door handle by prying tab on cable outward while pulling back on cable. (Scheme 21) Unhook collar portion of the clip from cable attachment. Push upward on bottom of cable attachment to disengage cable from handle clip.
  3. Disconnect harness connectors and remove door trim panel. Disconnect harness connectors from door module. Remove door module by releasing tabs on top and bottom. (Scheme 22) To install, reverse removal procedure.

Scheme 21

Scheme 21
Scheme 21

Scheme 22

Scheme 22
Scheme 22
  1. Raise and support vehicle. Remove left front wheel and left front splash guard. Remove left air injection pump to gain access to Electronic Brake Control Module (EBCM). (Scheme 4)
  2. Ensure area around EBCM is free from loose dirt to prevent contamination of Anti-Lock Brake System (ABS) components. Thoroughly wash all components around EBCM. Rotate EBCM connector tab up to unlocked position. Remove connector position assurance from EBCM connector and disconnect. Ensure ignition switch is in OFF position. Disconnect EBCM harness connector.
  3. Disconnect Brake Pressure Modulator Valve (BPMV) pump motor harness connector from bottom of EBCM. Remove 6 screws attaching EBCM to BPMV and separate EBCM from BRMV. (Scheme 23) To install, reverse removal procedure.

Scheme 23

Scheme 23
Scheme 23
  1. Disable air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Remove left and the right windshield garnish molding. Remove instrument panel air outlet deflectors. Remove instrument panel upper trim pad.
  2. Remove screw securing cluster trim panel and passenger's side trim panel together. Remove 2 screws on each side of instrument panel cluster. Lift instrument panel cluster trim out of retainer. Remove instrument cluster trim panel.
  3. Remove 4 screws from instrument panel cluster to retainer. Partially remove instrument panel cluster. Disconnect instrument panel cluster harness connectors. To install, reverse removal procedure. Tighten instrument panel cluster screws to 14 INCH lbs. (1.5 N.m).

Note. Instrument Panel Module is part of Heating Ventilation Air Conditioning (HVAC) control module and must be replaced as a unit. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

Note. Heated seat cushion cover connectors and several wire hold down clips will need to be removed in order to position seat cushion against seat back.

Disable air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Move seat to full forward position. Remove seat track retainer bolt adjuster covers and seat track retainer bolts. Move seat to full rearward position. Remove front seat track cover and recline seat back fully rearward. Tilt seat forward and disengage front mounting points from the floor. Disconnect harness connectors and remove seat from vehicle. Disconnect memory seat module harness connectors. Drill rivets retaining memory seat module to seat and remove. (Scheme 24) To install, reverse removal procedure.

Scheme 24

Scheme 24: Removal & Installation
Scheme 24: Removal & Installation
  1. Gain access to radio and Navigation Module (NAV) located under rear package shelf. Disconnect navigation data processor and radio harness connectors. Remove bolts securing navigation data processor/radio bracket to rear shelf. Remove navigation data processor, radio, and bracket assembly from vehicle.
  2. Remove nuts securing navigation data processor to navigation data processor/radio bracket and remove navigation data processor. To install, reverse removal procedure. Torque navigation data processor/radio bracket nuts to 44 INCH lbs. (5 N.m).
  1. Use small hooked tool and reach behind center trim panel at top of radio. Pull towards rear of vehicle to disengage center trim panel retainers. Remove center trim panel.
  2. Place shifter lever in neutral position. Open console door and lift upward on rear edge of console trim panel. Pull trim panel rearward. Disconnect harness connectors as necessary and remove console trim panel.
  3. Remove 4 screws attaching navigation display unit and A/C-Heater control panel bracket at top and bottom of bracket. Disconnect harness connectors and pull display and A/C-Heater control panel away from instrument panel with bracket.
  4. Remove nuts securing display or A/C-heater control panel to bracket. To install, reverse removal procedure. If display is to be replaced, remove mounting brackets and studs from display for installation on new display unit.
CAUTIONElectronic components used in control systems are designed to carry very low voltages. As little as a 30-volt charge created by static electricity can cause a total or degrading failure in PCM or other electronic components containing integrated circuits. Before servicing Powertrain Control Module (PCM), technician must be grounded and work area to discharge static electricity.

Note. Prior to removal, record transaxle fluid and engine oil life indexes. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

  1. Turn ignition switch to OFF position. Disconnect negative battery cable. Remove any necessary components to gain access to PCM. Remove screw securing intake air duct/resonator to PCM housing. Unsnap air filter housing clamps.
  2. Pull intake air duct/resonator assembly up enough to remove air cleaner cover and PCM. Slide air cleaner element assembly toward fender to separate air cleaner element assembly from air inlet assembly.
  3. Loosen PCM mounting bolts. Disconnect harness connectors from PCM. Remove PCM. To install, reverse removal procedure. Transfer any necessary components (i.e., knock sensor module, etc.) to new PCM before installation. Program replacement PCM using appropriate equipment and latest software. See «POWERTRAIN CONTROL MODULE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__powertrain-control-module) under PROGRAMMING.

Open rear compartment lid. Remove spare tire. Remove convenience net. Sill plate retainers are push on, screw off type. Remove convenience net retainers retaining rear compartment sill plate to vehicle. Lift rear compartment sill plate to disengage clips from the sill and remove. Remove convenience net retainers retaining rear compartment trim panel to floor. Remove retainers at rear edge of rear compartment front trim panel. Remove rear compartment front and rear compartment trim panel. To install, reverse removal procedure.

Disconnect negative battery cable. Remove rear compartment trim panel. See REAR COMPARTMENT TRIM PANEL . Remove bay board fasteners and pull bay board away from body. Place bay board module side up in rear compartment. Disconnect harness connections from Rear Integration Module (RIM). Remove fasteners retaining module to bay board and remove RIM. To install, reverse removal procedure. Program RIM. See REAR INTEGRATION MODULE under PROGRAMMING.

Remove rear shelf trim from inside rear storage compartment. See REAR COMPARTMENT TRIM PANEL . Push on retainer at rear edge of bracket and slide towards driver's side. Disconnect harness connectors from all modules on bracket. Remove Remote Control Door Lock Receiver (RCDLR) from bracket. To install, reverse removal procedure.

  1. Disable air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article.
  2. Remove driver's hush panel. Remove left knee bolster trim panel by grasping top and bottom and pull rearward to disengage retainers. Remove knee bolster trim vehicle.
  3. Remove bolts attaching steering column to instrument panel to lower steering column. Disconnect steering column module harness connectors. (Scheme 9) Loosen steering column module retaining screw and slide out of bracket.
  4. To install, reverse removal procedure. After installation, steering column module must be programmed. See «STEERING COLUMN CONTROL MODULE»(/cadillac/seville/v-1998-2004/remont/communication-devices/#body-control-modules__steering-column-control-module) under PROGRAMMING.

Remove driver's hush panel. Disconnect theft deterrent module harness connector. Move bottom of module toward brake pedal first and then slide down from bracket to remove. To install, reverse removal procedure.

WIRING DIAGRAMS

Note. For class 2 serial data line wiring diagrams, see DATA LINK CONNECTORS article.

Dash Integration Module Wiring Diagram (Seville). Scheme 25

Scheme 25: Dash Integration Module Wiring Diagram (Seville)
Scheme 25: Dash Integration Module Wiring Diagram (Seville)

Instrument Panel Integration Module Wiring Diagram (Seville). Scheme 26

Scheme 26: Instrument Panel Integration Module Wiring Diagram (Seville)
Scheme 26: Instrument Panel Integration Module Wiring Diagram (Seville)

Rear Integration Module Wiring Diagram (Seville). Scheme 27

Scheme 27: Rear Integration Module Wiring Diagram (Seville)
Scheme 27: Rear Integration Module Wiring Diagram (Seville)

See also:
• THEFT DETERRENT MODULE
• SELF-DIAGNOSTIC SYSTEM
• AIR BAG SYSTEM DIAGNOSTIC SYSTEM CHECK
• AIR CONDITIONING SYSTEM DIAGNOSTIC SYSTEM CHECK
• ANTI-LOCK BRAKE DIAGNOSTIC SYSTEM CHECK
• AUDIBLE WARNINGS DIAGNOSTIC SYSTEM CHECK
• AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL DIAGNOSTIC SYSTEM CHECK
• CELLULAR COMMUNICATION DIAGNOSTIC SYSTEM CHECK
• CRUISE CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK
• DEFOGGER DIAGNOSTIC SYSTEM CHECK
• DISC BRAKES DIAGNOSTIC SYSTEM CHECK
• DOOR SYSTEMS DIAGNOSTIC SYSTEM CHECK
• ENGINE CONTROLS DIAGNOSTIC SYSTEM CHECK
• ENGINE COOLING DIAGNOSTIC SYSTEM CHECK
• ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK
• BODY REAR END DIAGNOSTIC SYSTEM CHECK
• HORNS DIAGNOSTIC SYSTEM CHECK
• HYDRAULIC BRAKES DIAGNOSTIC SYSTEM CHECK
• INSTRUMENT CLUSTER DIAGNOSTIC SYSTEM CHECK
• LIGHTING SYSTEMS DIAGNOSTIC SYSTEM CHECK
• NAVIGATION SYSTEM DIAGNOSTIC SYSTEM CHECK
• PARK BRAKE DIAGNOSTIC SYSTEM CHECK
• POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK
• POWER SUN ROOF DIAGNOSTIC SYSTEM CHECK
• RADIO/AUDIO SYSTEM DIAGNOSTIC SYSTEM CHECK
• REMOTE KEYLESS ENTRY DIAGNOSTIC SYSTEM CHECK
• RETAINED ACCESSORY POWER DIAGNOSTIC SYSTEM CHECK
• ROAD SENSING SUSPENSION DIAGNOSTIC SYSTEM CHECK
• STEERING WHEEL & COLUMN - TILT DIAGNOSTIC SYSTEM CHECK
• THEFT DETERRENT DIAGNOSTIC SYSTEM CHECK
• TIRE PRESSURE MONITORING DIAGNOSTIC SYSTEM CHECK
• VARIABLE EFFORT STEERING DIAGNOSTIC SYSTEM CHECK
• WIPER/WASHER DIAGNOSTIC SYSTEM CHECK
• TEST A: SCAN TOOL DOES NOT POWER UP
• TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE
• TEST C: POWER MODE MISMATCH
• DIAGNOSTIC TROUBLE CODE DEFINITIONS
• CLASS 2 SERIAL DATA LINE
• BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK
• DIAGNOSTIC AIDS
• PROGRAMMING
• CODE ENABLE CRITERIA
• WINDOW MOTOR PROGRAMMING - EXPRESS MODE
• VEHICLE COMMUNICATION UNIT/VEHICLE INTERFACE UNIT (ONSTAR(R))
• POWERTRAIN CONTROL MODULE
• STEERING COLUMN CONTROL MODULE