Power Seat System Cadillac Seville V

DESCRIPTION & OPERATION

HEATED SEATS

Heated seats consists of 4 heated seats, 2 in front and 2 in rear. Each heated seat consists of these components: heated seat module, heated seat switch, seat back heating and seat cushion heating elements. Rear Integration Module (RIM), Driver's Door Module (DDM), Left Rear Door Module (LRDM) and Right Rear Door Module (RRDM) are involved in operation of heated seats. System is functional only with ignition switch turned to RUN position.

Power & Grounds

Battery voltage is supplied to front and rear heated seat module through ignition 3 voltage circuit and IGN 3 fuse, located in rear fuse block. This voltage is used to power up these modules: heated seat module, RIM, DDM, LRDM or RRDM. Battery voltage is also supplied at all times to all 4 heated seat modules from these fuses, located in rear fuse block

1. HTDST LF fuse.
2. HTDST RF fuse.
3. HTDST LR fuse.
4. HTDST RR fuse.

This battery voltage is used by modules to apply voltage to seat heating elements. Left and right front heated seat modules are grounded through a module ground circuit. Left and right rear heated seat modules are grounded through a module ground circuit. Left and right front heated seat switches are grounded through switch ground circuit. Left and right rear heated seat switches are grounded through switch ground circuit, provided by an associated door module.

Temperature Regulation

Heated seat system is designed in order to warm seat cushion and seat back to approximately 107.6°F (42°C) when in high position, and 98.6°F (37°C) when in low position. Heated seat module monitors seat temperature through temperature sensor signal circuit and temperature sensor (thermistor) which is located in seat cushion. Temperature sensor is a variable resistor, it's resistance changes as temperature of seat changes. When temperature sensor resistance indicates to heated seat module that seat has reached desired temperature, module opens ground path of seat heating elements through heated seat element control circuit. Module will then cycle element control circuit open and closed in order maintain desired temperature.

Front Heated Seat Operation

When heated seat switch is first pressed, heated seat high/low signal circuit of heated seat module is momentarily grounded through HI/LO switch contacts indicating a high heat command. In response to this signal, heated seat module applies battery voltage to seat cushion/back heating elements setting temperature level to high heat. When heated seat switch is pressed a second time, heated seat high/low signal circuit of heated seat module is again momentarily grounded through HI/LO switch contacts indicating a low heat command. In response to this second signal, heated seat module then sets temperature level to low heat. When heated seat switch is pressed a third time, heated seat high/low signal circuit of heated seat module is again momentarily grounded through HI/LO switch contacts indicating a heat off command. In response to this signal, heated seat module removes battery voltage from seat heating elements.

Front Heated Seat Switch Indicators

When heated seat is off and front heated seat switch is pressed once, heated seat temperature is set to high heat. Heated seat module applies 5 volts through heated seat high temperature indicator control circuit to heated seat switch, illuminating high temperature indicator. When switch is pressed a second time, heated seat temperature is set to low heat. Heated seat module applies 5 volts through heated seat low temperature indicator control circuit to heated seat switch, illuminating low temperature indicator. After switch is pressed a third time, heated seat is turned off, and front heated seat module removes voltage from low temperature indicator.

Rear Heated Seat Operation

When heated seat switch is first pressed, heated seat switch signal circuit of rear door module is momentarily grounded through switch contacts indicating a high heat command. Rear door module then sends a simple buss interface message to Driver's Door Module (DDM) indicating high heat command. DDM then sends out a class 2 message to Rear Integration Module (RIM) indicating high heat command. RIM momentarily sends a 35 millisecond one shot pulse signal that is pulled low through heated seat switch signal circuit of rear heated seat module, indicating high heat command. In response to this signal, heated seat module will then apply battery voltage to seat cushion/back heating elements setting temperature level to high heat.

When switch is pressed a second time, heated seat switch signal circuit of rear door module is again momentarily grounded indicating a low heat command. Rear door module then sends out a simple buss interface message to DDM indicating low heat command. DDM then sends out a class 2 message to RIM indicating low heat command. RIM again momentarily sends a 35 millisecond one shot pulse signal that is pulled low through heated seat switch signal circuit of heated seat module, indicating low heat command. In response to this signal, heated seat module then sets temperature level to low heat.

After switch is pressed a third time, heated seat switch signal circuit of rear door module is again momentarily grounded, indicating a heat off command. Rear door module then sends out a simple buss interface message to DDM indicating heat off command. DDM then sends out a class 2 message to RIM indicating heat off command. RIM again momentarily sends a 35 millisecond one shot pulse signal that is pulled low through heated seat switch signal circuit of heated seat module, indicating heat off command. In response to this signal, heated seat module then removes battery voltage from seat heating elements turning off heated seats.

Rear Heated Seat Switch Indicators

When heated seat is off and rear heated seat switch is pressed once, heated seat temperature is set to high heat. Rear door module applies battery voltage through heated seat high temperature indicator control circuit to heated seat switch, illuminating high temperature indicator. When pressed a second time, heated seat temperature is set to low heat. Rear door module applies battery voltage through heated seat low temperature indicator control circuit to heated seat switch, illuminating low temperature indicator. After switch is pressed a third time, heated seat is turned off, and rear door module removes battery voltage from low temperature indicator.

Load Management

There are 3 levels of load management that are controlled by Dash Integration Module (DIM). DIM sends status of load management to Rear Integration Module (RIM) through a class 2 message. An ON/OFF status of heated seats is reported to RIM through a status signal circuit of each heated seat module. RIM inhibits heated seat function for heated seats through heated seat module inhibit signal circuit according to level of load management. During load shed level 00, RIM leaves heated seat inhibit signal circuit open so that each heated seat module is in the normal mode of operation. During load shed level 01, RIM will cycle signal from high to low every 0.25 seconds to control heat level to low setting. During load shed level 02, RIM will supply a constant ground through heated seat module inhibit signal circuit to heated seat modules. In response to this signal, heated seat module then removes battery voltage from seat heating elements. Instrument cluster will display a BATTERY SAVER ACTIVE message.

LUMBAR SUPPORT WITH AUTO CONTOUR CONTROL

Driver's and passenger's adaptive seat each consists of these components: lumbar switch, adaptive lumbar module, pump motor, seat cushion air bladder, seat back air bladder, IGN 3 RR 10-amp fuse and MEM T&T 10-amp fuse. This is a power inflate/deflate pneumatic system used for controlling seat comfort by inflating or deflating an air cell within seat cushion or seat back. An adaptive seat system will operative on when ignition switch is in RUN position.

Battery voltage is supplied at all times to driver's and passenger's adaptive lumbar modules through battery voltage circuit and MEM T&T fuse, located in rear fuse block. Battery voltage is also supplied to adaptive lumbar modules through ignition 3 voltage circuit and IGN 3 fuse, located in rear fuse block. Both driver's and passenger's adaptive lumbar modules are grounded through module ground circuit. Battery voltage is supplied to lumbar switch through battery voltage circuit and adaptive lumbar module.

Manual Lumbar Control

Lumbar support in seat back may be adjusted manually. When lumbar forward switch is operated to move lumbar support forward and increase amount of lumbar support, battery voltage is applied through switch contacts and lumbar forward signal circuit to adaptive lumbar module. In response to this signal, adaptive lumbar module applies battery voltage to lumbar pump motor. Motor runs to inflate lumbar bladder in seat back until switch is released. When lumbar rearward switch is operated to move lumbar rearward and decrease amount of lumbar support, battery voltage is applied through switch contacts and lumbar rearward signal circuit to module. In response to this signal, module releases air from lumbar support bladder until switch is released.

Adaptive Control

At beginning of 2001 model year production, driver's and passenger's adaptive seat feature automatically activates with ignition switch turned to RUN position. During production, feature was changed from automatic activation to manual activation. To manually activate adaptive seat feature, momentarily press lumbar switch where it is marked AUTO/ON. When AUTO/ON switch is pressed, battery voltage is applied through switch contacts and adaptive seat switch auto/on signal circuit to adaptive lumbar module. In response to this signal, module will inflate seat bladders as described in manual control, take a reading, then automatically adjust comfort level to occupant by releasing air from bladders or adding air to bladders when needed. Adaptive lumbar module will check position of occupant every 4 minutes. If occupant has moved, adaptive lumbar module will then automatically adjust amount of air to new position of occupant. If adaptive function is not desired, driver's or passenger's must manually deactivate or turn off system. System is turned off by pressing lumbar switch down to off position. Battery voltage is then applied through switch contacts and adaptive seat off switch signal circuit to module. In response to this signal, adaptive lumbar module will release all air from bladders.

LUMBAR SUPPORT WITH MEMORY

Driver's seat lumbar support system consists of these components: left lumbar switch, Memory Seat Module (MSM), lumbar horizontal and vertical motors, lumbar horizontal and vertical position sensors and MEM T&T 10-amp fuse.

Lumbar Switch

Battery voltage is supplied at all times to left lumbar switch from MEM T&T fuse, located in rear fuse block. When left lumbar switch is pressed, a 12 volt signal is sent to Memory Seat Module (MSM). MSM commands lumbar motors to move in response to switch signals.

Motors

Lumbar support system consists of 2 motors (vertical and horizontal) that operate independently of each other. Each motor contains a electronic circuit breaker which will reset only after voltage has been removed from motor. Lumbar horizontal motor moves lumbar support in forward and rearward directions, and lumbar vertical motor moves lumbar support in up and down directions. Memory Seat Module (MSM) provides each motor with a soft stop that will actually stop motor just before its physical end-of-travel. This decreases stress on each motor. If a motor reaches end-of-travel due a soft stop and switch is released and pressed again, lumbar support will move short distance farther to physical travel limit.

Horizontal

When lumbar switch is operated to move lumbar support forward, battery voltage is applied through switch contacts and left lumbar forward switch signal circuit to Memory Seat Module (MSM). In response to this signal, MSM applies battery voltage through lumbar motor forward control circuit and ground through lumbar motor rearward control circuit to horizontal motor. Motor runs to drive lumbar support forward toward occupant's back until switch is released. Moving lumbar support rearward works similarly to moving lumbar support forward, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction. MSM also controls lumbar horizontal motor during memory recall functions.

Vertical

When lumbar switch is operated to move lumbar support up, battery voltage is applied through switch contacts and left lumbar up switch signal circuit to Memory Seat Module (MSM). In response to this signal, MSM applies battery voltage through lumbar motor up control circuit and ground through lumbar motor down control circuit to vertical motor. Motor runs to drive lumbar support up until switch is released. Moving lumbar support down works similarly to moving lumbar support up, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction. MSM also controls lumbar vertical motor during memory recall functions.

Position Sensors

Lumbar position sensors are potentiometers which are attached directly to each lumbar motor. Memory Seat Module (MSM) supplies a 5-volt reference voltage through a 5-volt reference circuit and ground through a low reference circuit to each lumbar position sensor. When lumbar motor rotates, resistance of potentiometer varies, changing feedback voltage of position sensor signal circuit. This voltage varies from 0.25-4.75 volts. MSM monitors this voltage signal to determine a lumbar position. When a memory set command is received, MSM records lumbar position by storing feedback voltage from each position sensor. When a memory recall command is received, MSM moves motors until position sensor feedback voltages equals feedback voltages stored in memory. Lumbar support is not involved in easy exit function.

LUMBAR SUPPORT WITHOUT MEMORY

Driver's and passenger's seat lumbar support consists of these components: lumbar switch, lumbar horizontal and vertical motors, PWR SEAT 30-amp circuit breaker and RR LUM/ANT 20-amp fuse.

Battery voltage is supplied at all times to driver's and passenger's seat lumbar switches from PWR SEAT circuit breaker, located in rear fuse block. Battery voltage is supplied at all times to left rear and right rear passenger's lumbar switches from RR LUM/ANT fuse, located in rear fuse block. All 4 lumbar switches are grounded through switch ground circuits. Lumbar switches provide both power and ground to selected lumbar motors.

Lumbar support system consists of 2 lumbar motors (horizontal and vertical) that operate independently of each other. Each motor contains an electronic circuit breaker that will reset only after voltage has been removed from motor. Lumbar horizontal motor moves lumbar support forward and rearward and lumbar vertical motor moves lumbar support up and down.

When lumbar switch is operated to move lumbar support rearward, battery voltage is applied through lumbar rearward switch contacts and lumbar motor rearward control circuit to lumbar horizontal motor. Motor is grounded through lumbar forward switch contacts and lumbar motor forward control circuit to horizontal motor. Motor runs to drive lumbar support rearward away from occupant's back until switch is released. Moving lumbar support forward works similarly to moving lumbar support rearward, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction.

When lumbar switch is operated to move lumbar support up, battery voltage is applied through lumbar up switch contacts and lumbar motor up control circuit to lumbar vertical motor. Motor is grounded through lumbar down switch contacts and lumbar motor down control circuit to vertical motor. Motor runs to drive lumbar support up until switch is released. Moving lumbar support down works similarly to moving lumbar support up, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction.

MEMORY SEATS

Memory seat system consists of these components: Memory Seat Module (MSM), seat horizontal motor, seat front and rear vertical motors, seat recline motor, headrest motor, lumbar horizontal and vertical motors, seat horizontal position sensor, seat front and rear vertical position sensors, seat recline position sensor, headrest position sensor, lumbar horizontal and vertical position sensors, power seat switch, seat lumbar switch memory function switch, PWR SEAT 30-amp circuit breaker and MEM T&T 10-amp fuse.

Personalization Option

Memory Seat Module (MSM) cannot perform memory recall functions unless personalization option is activated. Personalization option is located in Dash Integration Module (DIM). DIM reports personalization option setting to MSM, as well as other receiving modules, through a class 2 message each time ignition switch is cycled to RUN position. MSM will then store personalization option setting and examine it before making a memory seat adjustment. Personalization option setting stored within MSM will not change until personalization option setting in DIM is changed and ignition switch is cycled to RUN position.

Power Seat Switches

Battery voltage is supplied at all times to seat adjuster switch from MEM T&T fuse, located in rear fuse block. When power seat switches are pressed a 12 volt signal is sent to Memory Seat Module (MSM). MSM commands selected seat motor to move in response to switch inputs.

Memory Seat Module Power & Grounds

Battery voltage is supplied at all times to Memory Seat Module (MSM) from PWR SEAT 30-amp circuit breaker, located in rear fuse block. This voltage is used to power up MSM and also to apply power to seat motors when commanded. MSM is grounded through module ground circuit.

Seat Motors

Memory Seat Module (MSM) controls movement of each seat directional motors, and 2 lumbar motors. All motors operate independently of each other. Each motor contains an electronic circuit breaker, which will reset only after voltage has been removed from motor.

There are 4 motors that move position of seat. These are seat horizontal motor, front and rear vertical motor, and recline motor. Horizontal motor moves entire seat forward and rearward. Both vertical motors can run simultaneously when seat switch is operated in order to move entire seat up and down. Or can be selected independently to vertically tilt front or rear of seat up and down. Recline motor moves angle of seat back forward or rearward.

All seat motors are reversible. For example, when left seat switch is pressed to move entire seat forward, battery voltage is applied through power seat horizontal forward switch signal circuit to MSM. In response to this signal, MSM applies battery voltage through driver's seat horizontal motor forward control circuit, and ground through driver's seat horizontal motor rearward control circuit to motor. Motor runs in order to drive entire seat forward. Moving entire seat rearward works similarly to moving entire seat forward, except battery voltage and ground are applied on opposite circuits, causing motor to run in opposite direction. All of seat motors are powered this way.

MSM provides each seat motor with a soft stop that will actually stop motor just before physical end-of-travel. This decreases stress on each motor. If a motor reaches end-of-travel due a soft stop and left seat switch is released and then activated again, seat will move a short distance farther to physical travel limit.

Seat position sensors are potentiometers which are either attached directly to a motors transmission cable or are an internal part of motor. MSM supplies a 5-volt reference voltage through a 5-volt reference circuit and ground through a sensor low reference circuit to respective seat position sensors. When motor or cable rotates, resistance of potentiometer varies changing feedback voltage of position sensor signal circuit. Voltage varies from 0.25-4.75 volts. MSM monitors this voltage signal to determine position of seat. When a memory set command is received, MSM records seat position by storing feedback voltage from each position sensor. When a memory recall command is received, MSM moves motors until position sensor feedback voltages equals feedback voltages stored in memory. For an easy exit function, only seat position sensor feedback voltages are recorded and only seat motors are controlled. Lumbar support is not involved in easy exit function.

Memory Functions

Driver's Door Switch Assembly (DDSA) receives signals from memory function switch. DDSA then sends a message through a simple buss interface to Driver's Door Module (DDM) indicating that a memory function signal has been received. DDM then sends a message to Memory Seat Module (MSM) through class 2 serial data line. Current seat position may be recorded for 2 different drivers. To record a position, adjust driver's seat (including lumbar adjustments) and both outside mirrors to a comfortable position, then press MEMORY SET button. Within 5 seconds, press button 1 (for driver 1). A second mirror and seating position may be programmed by repeating procedure and pressing button 2 (for driver 2). When MSM receives a memory set message, MSM records feedback voltages from position sensors for appropriate driver. Two personalized exit positions can be set by first recalling driver position 1 or 2, positioning steering wheel and seat (except lumbar and headrest) in desired exit positions and then pressing MEMORY SET button, and within 5 seconds, pressing EXIT button. When MSM receives a set easy exit message, MSM records feedback voltages from 3 seat position sensors and recline position sensor for appropriate driver.

When No. 1 or 2 button is pressed, a single chime is sounded through radio to acknowledge signal and MSM receives memory recall message. MSM then applies battery voltage to motors until position sensor feedback voltages equal feedback voltages stored in memory for appropriate driver. When EXIT button is pressed, a single chime is sounded to acknowledge signal and MSM receives an easy exit message. MSM then applies battery voltage to seat motors until position sensor feedback voltages equal feedback voltages stored in memory for appropriate driver. Memory recall will not work if transmission is out of Neutral or Park.

Recall Personalization

When a remote transmitter is used in order to unlock vehicle doors, Remote Keyless Entry (RKE) module communicates an unlock command and which driver performed command to Memory Seat Module (MSM) through a class 2 message. There are 2 personalized recall options when MSM receives an unlock message

1. Recall immediately upon receipt of RKE message.
2. Do not recall upon receipt of RKE message. Recall functions are only performed with memory buttons.

Memory Inhibit/Enable

Memory Seat Module (MSM) receives ignition switch signal and gear selector position through class 2 messages. When ignition switch is in OFF position, memory record, memory recall, personalization recall, and exit recall functions are all allowed. When ignition switch is in RUN position and gear selector is in Park, only recall personalization function is deactivated and all other memory functions are allowed. When ignition switch is in RUN position and gear selector is out of Park, only memory record is allowed, all other memory seat functions are not allowed.

Driver's and passenger's power seat system each consist of these components: seat adjuster switch, seat horizontal motor, seat front and rear vertical motor, seat recline motor, headrest motor and PWR SEAT 30-amp circuit breaker. Driver's and passenger's power seat systems operate independently of each other. Each motor contains an electronic circuit breaker, that will reset only after voltage has been removed from motor. Battery voltage is supplied at all times to each seat switch from PWR SEAT circuit breaker, located in rear fuse block.

When seat adjuster switch is operated to move entire seat forward, battery voltage is applied through entire seat forward switch contacts and entire seat forward control circuit to horizontal motor. Motor is grounded through entire seat rearward switch contacts and entire seat rearward control circuit to motor. Motor runs in order to drive entire seat forward until switch is released. Moving entire seat rearward works similarly to moving entire seat forward, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction.

Front Vertical

When seat adjuster switch is operated to tilt front seat up, battery voltage is applied through front vertical up switch contacts and front vertical up control circuit to front vertical motor. Motor is grounded through front vertical down switch contacts and front vertical down control circuit to motor. Motor runs in order to drive front seat up until switch is released. Tilting front of seat down works similarly to tilting front seat up, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction.

Rear Vertical

When seat adjuster switch is operated to tilt rear of seat up, battery voltage is applied through rear vertical up switch contacts and rear vertical up control circuit to rear vertical motor. Motor is grounded through rear vertical down switch contacts and rear vertical down control circuit to motor. Motor runs in order to drive the rear of seat up until switch is released. Tilting rear of seat down works similarly to tilting rear of seat up, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction.

Entire Seat Up Or Down

When seat adjuster switch is operated in order to move entire seat to up position, battery voltage is applied through both front vertical up and rear vertical up switch contacts, through front and rear vertical up control circuits to both vertical motors. Motors are grounded through front and rear vertical down switch contacts and front and rear vertical down control circuits to motors. Both motors run in order to drive entire seat up until switch is released. Moving entire seat down works similarly to moving entire seat up, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction.

Recline

When seat adjuster switch is operated to move seat back forward, battery voltage is applied through recline forward switch contacts and recline forward control circuit to motor. Motor is grounded through recline rearward switch contacts and recline rearward control circuit to motor. Motor runs in order to move seat back forward until switch is released. Moving seat back rearward works similarly to moving seat back forward, except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction.

Headrest

When seat adjuster switch is operated to raise headrest up, battery voltage is applied through headrest up switch contacts and headrest motor up control circuit to motor. Motor is grounded through headrest down switch contacts and headrest motor down control circuit to motor. Motor runs in order to move headrest up until switch is released. Moving headrest down works similarly to moving headrest up except battery voltage and ground are applied on opposite circuits causing motor to run in opposite direction.

COMPONENT LOCATIONS

Note. For component locations, refer to illustrations. (Scheme 1)- (Scheme 3).

COMPONENT LOCATIONS

Scheme 1

Scheme 2

Scheme 3

To program memory seats easy exit, use these following steps

1. Move seat to desired position.
2. Press MEMORY SET button, located on driver's door trim panel.
3. Press 1 or 2 button, depending on driver. A chime will sound to indicate setting has been saved.
4. Repeat steps for second driver.
5. Move seat to desired exit position.
6. Press MEMORY SET button.
7. Press EXIT button.
8. Press No. 1 or 2 button, depending on driver. A chime will sound to indicate setting has been saved.
9. Repeat steps for second driver.

Programming Using Driver's Information Center

To enter programming using Driver's Information Center (DIC), perform these following actions

1. Turn ignition switch to RUN position.
2. Place transmission in Park.
3. Press MEMORY SET 1 or 2 button, depending on driver.
4. Press INFO button. DIC will display FEATURE PROGRAMMING.
5. Press ON/OFF button to enter programming mode.
6. DIC displays Driver #1 or Driver #2, depending on chosen driver for programming.
7. Press INFO button up or down to scroll through feature choices.
8. Press ON/OFF button to turn one of these options on or off (only one choice can be ON at any given time): REMOTE RECALL MEMORY or KEY IN RECALL MEMORY.
9. Press INFO button to advance to next feature.
10. DIC displays AUTO EXIT SEAT.
11. Press ON/OFF button to turn this feature on or off.
12. Press INFO button to advance to next feature.
13. DIC displays AUTO EXIT STRG WHEEL.
14. Press ON/OFF button to turn this feature on or off.
15. Press INFO button to advance to next feature.
16. To exit programming mode, press INFO RESET button.

Using Tech 2 Scan Tool

Note. This procedure is written strictly for Tech 2 scan tool. A generic scan tool may be used, but may have limited capabilities.

To enter programming using Tech 2, perform these following steps

1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column.
2. Turn ignition switch to RUN position.
3. Select correct vehicle and model year.
4. Select body.
5. Select personalization.
6. Select set options.
7. Select Driver #1 memory recall or Driver #2 memory recall.
8. Select on of these options: auto exit driver seat, key in IGN recall driver seat, remote entry recall driver seat, recall exit on RKE unlock.
9. Press ENTER to turn option on or off. (An asterisk appears next to current options).
10. Exit from menu.
11. Select DRIVER #1 auto exit seat or DRIVER #2 auto exit seat.
12. Highlight auto exit seat and press ENTER button to turn selection on or off. (An asterisk appears next to feature turned on.).
13. Exit from menu.

REAR INTEGRATION MODULE

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).
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.

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 illustration. (Scheme 4) 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 4

1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. 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 under SYSTEM TESTS in BODY CONTROL MODULES - SEVILLE article.
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 under SYSTEM TESTS in BODY CONTROL MODULES - SEVILLE article.
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 under SYSTEM TESTS in BODY CONTROL MODULES - SEVILLE article.
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 «SYMPTOM INDEX»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) table under SYSTEM TESTS.
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 under SYSTEM TESTS in BODY CONTROL MODULES - SEVILLE article.
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 in BODY CONTROL MODULES - SEVILLE article.
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/seats/#power-seat-system__diagnostic-trouble-code-definitions) .

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DIAGNOSTIC TROUBLE CODE DEFINITIONS

Description

When left seat switch is pressed, a 12 volt signal is sent to Memory Seat Module (MSM). MSM commands driver's seat to move in response to switch inputs. If a seat switch circuit continues to be active for 30 seconds after a motor controlled by switch reaches end of travel, switch will be considered shorted. If a position sensor DTC is current, and associated switch is active for 30 continuous seconds, switch will be considered shorted. MSM will store DTC. When DTC is stored, motor output driven in response to a switch considered failed, is deactivated for both directions, memory recall commands are ignored, and MSM will respond to any other switch input that has not stored a DTC. DTC automatically clears when switch circuit for storing DTC is no longer active.

Code Enable Criteria

The following must occur for DTC to run

1. Memory Seat Module (MSM) must have power, and cannot have B1327 or B1328 stored.

Testing

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) 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. Turn ignition switch to RUN position. Using scan tool, observe suspect seat or lumbar switch parameter in Memory Seat Module (MSM) data list. If scan tool displays INACTIVE, go to next step. If scan tool does not display INACTIVE, go to step 4 .
3. Using scan tool, observe suspect seat or lumbar switch parameter. Using suspect seat or lumbar switch, activate seat. If switch parameter does not change state, go to next step. If switch parameter changes state, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
4. Turn ignition switch to OFF position. Disconnect suspect seat or lumbar switch harness connector. Turn ignition switch to RUN position. Using scan tool, observe all switch parameters in MSM data list. If scan tool does not display INACTIVE for all switch parameters, go to next step. If scan tool displays INACTIVE for all switch parameters, go to step 7 .
5. Inspect suspect seat switch signal circuit for a short to voltage between suspect seat switch and MSM harness connector. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to next step. If problem exists, repair seat switch signal circuit as necessary. After repair, go to step 10 .
6. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 8 . If problem exists, repair MSM harness connector as necessary. After repair, go to step 10 .
7. Inspect suspect seat or lumbar switch for poor connections. If problem does not exist, go to step 9 . If problem exists, repair suspect seat or lumbar switch as necessary. After repair, go to step 10 .
8. Replace MSM, then go to step 10 .
9. Replace suspect seat or lumbar switch. After repair, go to next step.
10. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__code-enable-criteria) . If DTC resets, repeat test beginning at step 2 .

A position sensor that stores this DTC is either attached to seat directional motor drive cable or directly to motor it monitors. A 5-volt reference and ground is received from Memory Seat Module (MSM). A sensor sends a voltage signal that varies with movement of seat through signal circuit to MSM. Based on this voltage signal, MSM determines position of seat. If MSM sees an analog input from this sensor as either less than 0.25 volts or 4.75 volts or more, sensor will be considered out of range, and MSM will store DTC. When DTC is stored, MSM disables memory recall and easy exit/entry action commands of motor monitored by sensor. Motor will respond to manual positioning commands. MSM will clear DTC as an active malfunction when analog input from this sensor is 0.25-4.75 volts during one cycle of checking MSM inputs.

The following must occur for DTC to run

1. Memory Seat Module (MSM) must be powered and cannot have B1327 stored.

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) 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. Turn ignition switch to RUN position. Using scan tool, observe suspect sensor parameter in Memory Seat Module (MSM) data list. Sensor parameter should be 0.25-4.75 volts. If scan tool does not indicate sensor parameter is within specified range, go to next step. If scan tool indicates sensor parameter is within specified range, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Turn ignition switch to OFF position. Disconnect suspect position sensor harness connector. Turn ignition switch to RUN position. Using scan tool, observe sensor parameter. Sensor parameter should be 2 volts. If scan tool indicates sensor parameter is less than specified value, go to next step. If scan tool does not indicate sensor parameter is less than specified value, go to step 10.
4. Turn ignition switch to OFF position. Connect a 3-amp fused jumper wire between suspect position sensor harness connector Gray wire and signal circuit terminals. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Turn ignition switch to RUN position. Using scan tool, observe suspect sensor parameter. Sensor parameter should be 4.75 volts. If scan tool indicates sensor parameter is greater than specified value, go to next step. If scan tool does not indicate sensor parameter is greater than specified value, go to step 8.
5. Remove fused jumper wire. Measure voltage between suspect position sensor harness connector Gray wire and Black wire terminals. If voltage is less than 5.5 volts, go to next step. If voltage is 5.5 volts or more, go to step 7.
6. Turn ignition switch to OFF position. Measure resistance between ground and suspect position sensor harness connector Black wire terminal. If resistance is 5 ohms or more, go to step 11. If resistance is less than 5 ohms, go to step 12.
7. Inspect Gray wire for a short to voltage between suspect position sensor and MSM. If problem does not exist, go to step 13. If problem exists, repair Gray wire as necessary. After repair, go to step 16.
8. Inspect Gray wire for an open, high resistance or short to ground between suspect position sensor and MSM. If problem does not exist, go to next step. If problem exists, repair Gray wire as necessary. After repair, go to step 16.
9. Inspect signal circuit for an open, high resistance or short to ground between suspect position sensor and MSM. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If problem does not exist, go to step 13. If problem exists, repair signal circuit as necessary. After repair, go to step 16.
10. Inspect signal circuit for a short to voltage between suspect position sensor and MSM. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If problem does not exist, go to step 13. If problem exists, repair signal circuit as necessary. After repair, go to step 16.
11. Disconnect MSM 32-pin harness connector C2. MSM is located below driver's seat. Inspect Black wire for an open or high resistance between MSM harness connector C2 terminal C15 (Light Blue connector with lumbar) or A15 (Dark Red connector without lumbar) and suspect position sensor. (Scheme 5)or (Scheme 6). If problem does not exist, go to step 13. If problem exists, repair Black wire as necessary. After repair, go to step 16.
12. Inspect suspect position sensor harness connector for poor connections. If problem does not exist, go to step 14. If problem exists, repair suspect position sensor as necessary. After repair, go to step 16.
13. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 16.
14. Replace suspect position sensor. After repair, go to step 16.
15. Replace MSM, then go to next step.
16. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If DTC resets, repeat test beginning at step 2.

Scheme 5

Scheme 6

Diagnostic Aids

All position sensors use common ground and 5-volt reference circuits. If a 5-volt reference circuit is short to ground or voltage, multiple codes will store. If a sensor ground circuit is open, multiple codes will store.

When left seat switch is pressed, a 12 volt signal is sent to Memory Seat Module (MSM). MSM commands driver's seat to move in response to switch inputs. If left seat switch circuit continues to be active for 30 seconds after a motor controlled by that switch reaches end of travel, switch will be considered shorted, and MSM will store DTC. If a position sensor DTC is current and associated switch is active for 30 continuous seconds, switch will be considered shorted, and MSM will store DTC. When DTC is stored, motor output driven in response to a switch considered failed is deactivated for both directions, all memory commands are ignored, and MSM will respond to any other switch input that has not stored a DTC. DTC automatically clears when switch circuit storing DTC is no longer active.

The following must occur for DTC to run

1. Memory Seat Module (MSM) must be powered, and cannot have B1327 stored.

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) 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. Turn ignition switch to RUN position. Using scan tool, observe left headrest up parameter in Memory Seat Module (MSM) data list. If scan tool displays INACTIVE, go to next step. If scan tool does not display INACTIVE, go to step 4 .
3. Using scan tool, observe headrest up parameter. Using left seat switch, operate headrest switch to UP position. If headrest up parameter does not change state, go to next step. If headrest up parameter changes state, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
4. Turn ignition switch to OFF position. Disconnect left seat switch Gray 4-pin harness connector. Turn ignition switch to RUN position. Using scan tool, observe all switch parameters in MSM data list. If scan tool does not display INACTIVE for all parameters, go to next step. If scan tool displays INACTIVE for all parameters, go to step 7 .
5. Inspect switch signal circuit that displayed active for a short to voltage between headrest motor and MSM. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to next step. If problem exists, repair switch signal circuit as necessary. After repair, go to step 10 .
6. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 8 . If problem exists, repair MSM harness connector as necessary. After repair, go to step 10 .
7. Inspect left seat switch harness connector for poor connections. If problem does not exist, go to step 9 . If problem exists, repair, left seat switch harness connector as necessary. After repair, go to step 10 .
8. Replace MSM, then go to step 10 .
9. Replace left seat switch. After repair, go to next step.
10. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERA»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If DTC resets, repeat test beginning at step 2 .

When left seat switch is pressed, a 12 volt signal is sent to Memory Seat Module (MSM). MSM commands driver's seat to move in response to switch inputs. If left seat switch circuit continues to be active for 30 seconds after a motor controlled by that switch reaches end of travel, switch will be considered shorted, and MSM will store DTC. If a position sensor DTC is current, and associated switch is active for 30 continuous seconds, switch will be considered shorted, and MSM will store DTC. When DTC is stored, motor output driven in response to switch considered failed is deactivated for both directions, all memory recall commands are ignored, and MSM will respond to any other switch input that has not stored a DTC. DTC automatically clears when switch circuit storing DTC is no longer active.

The following must occur for DTC to run

1. Memory Seat Module (MSM) must be powered and cannot have B1327 stored.

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) 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. Turn ignition switch to RUN position. Using scan tool, observe headrest down parameter in Memory Seat Module (MSM) data list. If scan tool displays INACTIVE, go to next step. If scan tool does not display INACTIVE, go to step 4 .
3. Using scan tool, observe headrest down parameter. Using left seat witch, activate headrest to DOWN position. If headrest down parameter does not change state, go to next step. If headrest down parameter changes state, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
4. Turn ignition switch to OFF position. Disconnect left seat switch harness connector. Turn ignition switch to RUN position. Using scan tool, observe all switch parameters in MSM data list. If scan tool does not display INACTIVE for all switch parameters, go to next step. If scan tool displays INACTIVE for all switch parameters, go to step 7 .
5. Inspect switch signal circuit that displayed active for a short to voltage between headrest motor and MSM. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to next step. If problem exists, repair switch signal circuit as necessary. After repair, go to step 10 .
6. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 8 . If problem exists, repair MSM harness connector as necessary. After repair, go to step 10 .
7. Inspect left seat switch harness connector for poor connections. If problem does not exist, go to step 9 . If problem exists, repair left seat switch harness connector as necessary. After repair, go to step 10 .
8. Replace MSM, then go to step 10 .
9. Replace left seat switch. After repair, go to next step.
10. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If DTC resets, repeat test beginning at step 2 .

A position sensor that stores a DTC is either attached to seat directional motor drive cable or to directly to motor. Position sensor receives a 5-volt reference and ground from Memory Seat Module (MSM). Position sensor sends a voltage signal that varies with movement of seat through signal circuit to MSM. Based on voltage signal, MSM determines position of seat. If MSM sees analog input from sensor as either less than 0.25 volts or 4.75 volts or more, sensor will be considered out of range, and MSM will store DTC. When DTC is stored, MSM disables memory recall and easy exit/entry action commands of motor monitored by sensor. Motor will respond to manual positioning commands. MSM will clear DTC as an active malfunction when analog input from sensor is 0.25-4.75 volts during one cycle of checking MSM inputs.

The following must occur for DTC to run

1. Memory Seat Module (MSM) must be powered and cannot have B1327 stored.

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) 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. Turn ignition switch to RUN position. Using scan tool, observe headrest sensor parameter in Memory Seat Module (MSM) data list. Headrest sensor parameter should be 0.25-4.75 volts. If scan tool does not indicate headrest parameter is within specified range, go to next step. If scan tool indicates headrest parameter is within specified range, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Turn ignition switch to OFF position. Disconnect headrest sensor 3-pin harness connector. Headrest sensor is located in driver's seat back. Turn ignition switch to RUN position. Using scan tool, observe headrest sensor parameter. Headrest sensor parameter should be 0.25 volts. If scan tool indicates headrest sensor parameter is less than specified value, go to next step. If scan tool does not indicate headrest sensor parameter is less than specified value, go to step 10.
4. Turn ignition switch to OFF position. Connect a 3-amp fused jumper wire between headrest position sensor harness connector terminals "A" (Gray wire) and "B" (Red/Black wire). (Scheme 7) Turn ignition switch to RUN position. Using scan tool, observe headrest sensor parameter. Headrest sensor parameter should be 4.75 volts. If scan tool indicates headrest sensor parameter is greater than specified value, go to next step. If scan tool does not indicate headrest sensor parameter is greater than specified value, go to step 8.
5. Remove fused jumper wire. Measure voltage between headrest position sensor harness connector terminals "A" (Gray wire) and "C" (Black wire). If voltage is less than 5.5 volts, go to next step. If voltage is 5.5 or more volts, go to step 7.
6. Turn ignition switch to OFF position. Disconnect negative battery cable. Measure resistance between ground and headrest position sensor harness connector terminal "C" (Black wire). If resistance is 5 ohms or more, go to step 11. If resistance is less than 5 ohms, go to step 12.
7. Inspect Gray wire for a short to voltage between headrest position sensor and MSM harness connector C2 terminal C13 (Light Blue connector with lumbar) or A13 (Dark Red connector without lumbar) and headrest position sensor harness connector terminal "A". (Scheme 5), (Scheme 6) and (Scheme 7). If problem does not exist, go to step 13. If problem exists, repair Gray wire as necessary. After repair, go to step 16.
8. Inspect Gray wire for an open, high resistance or short to ground between MSM harness connector C2 terminal C13 (Light Blue connector with lumbar) or A13 (Dark Red connector without lumbar) and headrest position sensor harness connector terminal "A". (Scheme 5), (Scheme 6) and (Scheme 7). If problem does not exist, go to next step. If problem exists, repair Gray wire as necessary. After repair, go to step 16.
9. Inspect Red/Black wire for an open, high resistance or short to ground between MSM harness connector C2 terminal D6 (Light Blue connector with lumbar) or B6 (Dark Red connector without lumbar) and headrest position sensor harness connector terminal "B". If problem does not exist, go to step 13. If problem exists, repair Red/Black wire as necessary. After repair, go to step 16.
10. Inspect Red/Black wire for a short to voltage between MSM harness connector C2 terminal D6 (Light Blue connector with lumbar) or B6 (Dark Red connector without lumbar) and headrest position sensor harness connector terminal "B". (Scheme 5), (Scheme 6) and (Scheme 7). If problem does not exist, go to step 13. If problem exists, repair Red/Black wire as necessary. After repair, go to step 16.
11. Disconnect MSM harness connector C2. MSM is located below driver's seat. Inspect Black wire for an open or high resistance between MSM harness connector C2 terminal C15 (Light Blue connector with lumbar) or A15 (Dark Red connector without lumbar) and headrest position sensor harness connector terminal "C". If problem does not exist, go to step 13. If problem exists, repair Black wire as necessary. After repair, go to step 16.
12. Inspect headrest position sensor harness connector for poor connections. If problem does not exist, go to step 14. If problem exists, repair headrest position sensor harness connector as necessary. After repair, go to step 16.
13. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 16.
14. Replace headrest position sensor. After repair, go to step 16.
15. Replace MSM, then go to next step.
16. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If DTC resets, repeat test beginning at step 2.

Scheme 7

All position sensors use common ground and 5-volt reference circuits. If a 5-volt reference circuit is short to ground or voltage, multiple codes will store. If sensor ground circuit is open, multiple codes will store.

Memory function switches are normally open, and are wired to Driver's Door Switch Assembly (DDSA). When a memory recall switch is pressed, switch pulls 5-volt signal circuit from DDSA low. DDSA senses that a memory recall signal was pulled low and a class 2 message is sent out identifying that circuit is active. If a memory recall switch circuit is active for 30 continuous seconds or more, circuit will be considered shorted, and DDSA will store DTC. When DTC is stored, DDSA ignores an invalid switch input from memory function switch, and will not respond to it. DDSA will respond to all other valid switch inputs. DTC automatically clears when switch circuit storing DTC is no longer active.

The following must occur for DTC to run

1. Driver's Door Switch Assembly (DDSA) must be powered and cannot have B1327 or B1328 stored.

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) 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. Turn ignition switch to RUN position. Using scan tool, observe memory recall switches parameter in Driver's Door Module (DDM) data list. If scan tool does not display IDLE, go to next step. If scan tool displays IDLE, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Turn ignition switch to OFF position. Disconnect memory function switch harness connector. Turn ignition switch to RUN position. Using scan tool, observe memory recall switches parameter. If scan tool does not display IDLE, go to next step. If scan too displays IDLE, go to step 6 .
4. Inspect suspect memory switch signal circuit for a short to ground between ground and memory function switch. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to next step. If problem exists, repair, memory switch signal circuit as necessary. After repair, go to step 9 .
5. Inspect DDSA harness connector for poor connections. If problem does not exist, go to step 7 . If problem exists, repair DDSA harness connector as necessary. After repair, go to step 9 .
6. Inspect memory function switch harness connector for poor connections. If problem does not exist, go to step 8 . If problem exists, repair memory function switch harness connector as necessary. After repair, go to step 9 .
7. Replace DDSA, then go to step 9 .
8. Replace memory function switch, then go to next step.
9. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If DTC resets, repeat test beginning at step 2 .

Current drawn from battery supply to Memory Seat Module (MSM) is monitored. When an excessive current is detected, MSM disables seat motors to protect internal MSM circuitry. DTC B3793 will store when measured battery current exceeds 81 amps for 100 milliseconds. When DTC is stored, MSM disables all seat motors, and memory recalls in progress are aborted. Current status of DTC is cleared when DTC runs and does not detect excessive current.

The following must occur for DTC to run

1. Memory Seat Module (MSM) test for excessive current only when seat motors are active.

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) 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. Turn ignition switch to RUN position. Using scan tool, observe current DTCs in Memory Seat Module (MSM). Using left seat switch, operate in all directions for each motor. If scan tool displays DTC B3793 for any seat directional motor, go to next step. If scan tool does not display DTC B3793 for any seat directional motor, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Disconnect suspect seat motor harness connector. Using scan tool, observe current DTCs. Operate suspect motor in both directions. If scan tool displays DTC B3793, go to next step. If scan tool does not display DTC B3793, go to step 5 .
4. Inspect motor control circuits of suspect motor for a short to ground. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to step 6 . If problem exists, repair motor control circuit as necessary. After repair, go to step 9 .
5. Inspect suspect seat motor harness connector for poor connections. If problem does not exist, go to step 7 . If problem exists, repair suspect seat motor harness connector as necessary. After repair, go to step 9 .
6. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 8 . If problem exists, repair MSM harness connector as necessary. After repair, go to step 9 .
7. Replace suspect seat motor. After repair, go to step 9 .
8. Replace MSM, then go to next step.
9. Using scan tool, clear DTCs. Operate vehicle within code enable criteria. See «CODE ENABLE CRITERIA»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If DTC resets, repeat test beginning at step 2 .

SYSTEM TESTS

SYMPTOM INDEX

TEST A: HEATED SEAT INOPERATIVE - FRONT

1. Review heated seat operation. See «HEATED SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__heated-seats) under DESCRIPTION & OPERATION. After review, go to next step.
2. If heated seat system does not operate as described, go to next step. If heated seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Disconnect suspect heated seat module Black 8-pin harness connector C1. Measure voltage between ground and suspect heated seat module connector C1 terminal "B" (Orange wire). (Scheme 8) Voltage should be 10-15 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 24.
4. Measure voltage between suspect heated seat module harness connector C1 terminals "B" (Orange wire) and "E" (Black wire). (Scheme 8) Voltage should be 10-15 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 26.
5. Turn ignition switch to RUN position. Measure voltage between ground and suspect heated seat module harness connector C1 terminal "A" (Brown wire). (Scheme 8) Voltage should be 10-15 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 25.
6. Turn ignition switch to OFF position. Connect a test light between battery voltage and suspect heated seat module harness connector C1 terminal "H" (Yellow wire). If test light does not illuminate, go to next step. If test light illuminates, go to step 13.
7. Connect a test light between battery voltage and suspect heated seat module harness connector C1 terminal "C" (Pink wire for left seat or Pink/Black wire for right seat). If test light does not illuminate, go to next step. If test light illuminates, go to step 17.
8. Connect a test light between battery voltage and suspect heated seat module harness connector C1 terminal "C" (Pink wire for left seat, Pink/Black wire for right seat). Activate heated seat switch. If test light does not illuminate, go to next step. If test light illuminates, go to step 10.
9. Connect a test light between battery voltage and backprobe suspect heated seat switch harness connector terminal "C" (Pink wire for left seat, Pink/Black wire for right seat). (Scheme 9) Activate heated seat switch. If test light does not illuminate, go to step 18. If test light illuminates, go to step 27.
10. Disconnect suspect heated seat module harness connector C3. Measure resistance between suspect heated seat module harness connector C3 terminals "A" and "B". (Scheme 8) If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 22.
11. Measure resistance between heated seat module connector C2 terminals "A" and "B". (Scheme 8) If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 21.
12. With seat at room temperature, measure resistance between suspect heated seat module harness connector C2 terminals "C" and "D". (Scheme 8) Resistance should be 850-1150 ohms. If resistance is as specified, go to step 14. If resistance is not as specified, go to step 21.
13. Disconnect Rear Integration Module (RIM) Gray 16-pin harness connector C1. RIM is located behind right side of rear seat back. Inspect Yellow wire for a short to ground between ground and RIM harness connector C1 terminal B5. (Scheme 10) If problem does not exist, go to step 23. If problem exists, repair, Yellow wire as necessary. After repair, go to step 33.
14. Inspect heated seat cushion element supply voltage and control circuits for a short to ground. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If problem does not exist, go to next step. If problem exists, repair heated seat cushion element supply voltage and/or control circuits as necessary. After repair, go to step 33.
15. Inspect heated seat back element supply voltage and control circuits for a short to ground. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If problem does not exist, go to next step. If problem exists, repair heated seat back element supply voltage and/or control circuits as necessary. After repair, go to step 33.
16. Inspect temperature sensor signal circuit for a short to ground between suspect heated seat module harness connector C2 terminals "C" and "D". If problem does not exist, go to step 19. If problem exists, repair temperature sensor signal circuit as necessary. After repair, go to step 33.
17. Inspect Pink wire or Pink/Black wire for a short to ground between ground and suspect heated seat module harness connector C1 terminal "C". If problem does not exist, go to step 20. If problem exists, repair Pink wire or Pink/Black wire as necessary. After repair, go to step 33.
18. Inspect Black wire for an open between ground and suspect heated seat switch harness connector terminal "C" (left seat) or "D" (right seat). (Scheme 9) Ground point is located behind left kick panel. If problem does not exist, go to step 20. If problem exists, repair Black wire as necessary. After repair, go to step 33.
19. Inspect suspect heated seat module harness connector for poor connections. If problem does not exist, go to step 31. If problem exists, repair suspect heated seat module harness connector as necessary. After repair, go to step 33.
20. Inspect suspect heated seat switch harness connector for poor connections. If problem does not exist, go to step 32. If problem exists, repair suspect heated seat switch harness connector as necessary. After repair, go to step 33.
21. Inspect suspect seat cushion heating element/temperature sensor harness connector for poor connections. If problem does not exist, go to step 29. If problem exists, repair suspect seat cushion heating element/temperature sensor harness connector as necessary. After repair, go to step 33.
22. Inspect suspect seat back heating element harness connector for poor connections. If problem does not exist, go to step 28. If problem exists, repair suspect seat back heating element harness connector as necessary. After repair, go to step 33.
23. Inspect RIM harness connector for poor connections. If problem does not exist, go to step 30. If problem exists, repair RIM harness connector as necessary. After repair, go to step 33.
24. Repair open or short to ground in Orange wire between suspect heated seat module harness connector C1 terminal "B" and rear fuse block. (Scheme 8) After repair, go to step 33.
25. Repair open in Brown wire between suspect heated seat module harness connector C1 terminal "A" and rear fuse block. (Scheme 8) After repair, go to step 33.
26. Repair open in Black wire between ground and suspect heated seat module harness connector C1 terminal "E". (Scheme 8) Ground point is located below right front seat. After repair, go to step 33.
27. Repair open in Pink wire or Pink/Black wire between suspect heated seat module harness connector C1 terminal "C" and suspect heated seat switch harness connector terminal "C". (Scheme 8)and (Scheme 9). After repair, go to step 33.
28. Replace seat back heating element. After repair, go to step 33.
29. Replace seat cushion heating element/temperature sensor. After repair, go to step 33.
30. Replace RIM. After repair, go to step 33.
31. Replace suspect heated seat module. After repair, go to step 33.
32. Replace suspect heated seat switch. After repair, go to next step.
33. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

Scheme 8

Scheme 9

Scheme 10

TEST B: HEATED SEAT ALWAYS ON - FRONT

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review heated seat operation. See «HEATED SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__heated-seats) under DESCRIPTION & OPERATION. If heated seat system does not operate as described, go to next step. If heated seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Inspect front seat. If seat cushion is not only seat section that feels warm, go to next step. If only seat cushion that feels warm, go to step 6.
4. Disconnect suspect heated seat switch harness connector. Wait a few minutes. Feel seat back and cushion. If seat does not cool down, go to next step. If seat cools down, go to step 9.
5. Disconnect suspect heated seat module harness connector C3. Inspect suspect seat back heating element circuit for a short to voltage between suspect heated seat module harness connector C3 terminal "B" and seat back heating element. (Scheme 8) If problem does not exist, go to step 7. If problem exists, repair suspect seat back heating element circuit as necessary. After repair, go to step 12.
6. Disconnect suspect heated seat module Black 4-pin harness connector C2. Inspect suspect seat cushion heating element circuit for a short to voltage between suspect heated seat module harness connector C2 terminal "A" and seat cushion heating element. (Scheme 8) If problem does not exist, go to step 8. If problem exists, repair suspect seat cushion heating element circuit as necessary. After repair, go to step 12.
7. Disconnect suspect heated seat module Black 8-pin harness connector C1. Inspect Pink wire or Pink/Black wire for a short to ground. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If problem does not exist, go to next step. If problem exists, repair Pink wire or Pink/Black wire as necessary. After repair, go to step 12.
8. Inspect suspect heated seat module harness connector for poor connections. If problem does not exist, go to step 10. If problem exists, repair suspect heated seat module harness connector as necessary. After repair, go to step 12.
9. Inspect suspect heated seat switch harness connector for poor connections. If problem does not exist, go to step 11. If problem exists, repair suspect heated seat switch harness connector as necessary. After repair, go to step 12.
10. Replace suspect heated seat module. After repair, go to step 12.
11. Replace suspect heated seat switch. After repair, go to next step.
12. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

Scheme 11

1. Review heated seat operation. See «HEATED SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__heated-seats) under DESCRIPTION & OPERATION. After review, go to next step.
2. If heated seat system does not operate as described, go to next step. If heated seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe suspect rear heated seat parameter in Driver's Door Module (DDM) data list. Activate suspect heated seat switch. If scan tool displays ON, go to next step. If scan tool does not display ON, go to step 13.
4. Measure voltage by backprobing between ground and suspect heated seat module harness connector C1 terminal "B" (Orange wire). (Scheme 8) Voltage should be 10-15 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 33.
5. Measure voltage by backprobing between suspect heated seat module harness connector C1 terminals "B" (Orange wire) and "E" (Black wire). (Scheme 8) Voltage should be 10-15 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 35.
6. Measure voltage by backprobing between ground and suspect heated seat module harness connector C1 terminal "A" (Brown wire). (Scheme 8) Voltage should be 10-15 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 34.
7. Turn ignition switch to OFF position. Disconnect suspect heated seat module Black 8-pin harness connector C1. Connect a test light between suspect heated seat module harness connector C1 terminals "B" (Orange wire) and "C" (Pink wire for left seat, Brown for right seat). (Scheme 8) If test light does not illuminate, go to next step. If test light illuminates, go to step 19.
8. Turn ignition switch to RUN position. With test light still connected between suspect heated seat module harness connector C1 terminals "B" and "C", activate suspect heated seat switch. If test light illuminates, go to next step. If test light does not illuminate, go to step 18.
9. Turn ignition switch to OFF position. Measure resistance between ground and suspect heated seat module harness connector C1 terminal "H" (Yellow wire). (Scheme 8) If resistance is 10 ohms or more, go to next step. If resistance is less than 10 ohms, go to step 26.
10. Disconnect suspect heated seat module Black 4-pin harness connector C2. Measure resistance between suspect heated seat module harness connector C2 terminals "A" (Gray wire for left seat, Dark Green wire for right seat) and "B" (Brown wire for left seat, Light Green wire for right seat). (Scheme 8) If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 17.
11. Disconnect suspect heated seat module Light Green 2-pin harness connector C3. Measure resistance between suspect heated seat module harness connector C3 terminals "A" and "B". If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 29.
12. Measure resistance between suspect heated seat module harness connector C2 terminals "B" (Brown wire for left seat, Light Green wire for right seat) and "C" (Light Blue wire for left seat, Orange wire for right seat). (Scheme 8) Resistance should be 850-1150 ohms. If resistance is not within specified range, go to step 16. If resistance is within specified range, go to step 20.
13. Turn ignition switch to OFF position. Measure resistance between ground and backprobing suspect door module harness connector C1 terminal No. 14 (Brown wire). (Scheme 11) Activate heated seat switch. If resistance is 40 ohms or more, go to next step. If resistance is less than 40 ohms, go to step 31.
14. Inspect Brown wire for an open or short to voltage between suspect door module harness connector C1 terminal No. 14 and suspect heated seat switch harness connector terminal "C". (Scheme 8)and (Scheme 11). If problem does not exist, go to next step. If problem exists, repair Brown wire as necessary. After repair, go to step 42.
15. Inspect ground circuit for an open or high resistance between suspect heated seat switch harness connector terminal "D" (Tan/White wire for left seat, Black/White wire for right seat) and suspect door module harness connector C1 terminal No. 10. If problem does not exist, go to step 27. If problem exists, repair Tan/White wire or Black/White wire as necessary. After repair, go to step 42.
16. Inspect temperature sensor signal circuit and sensor low reference circuit for an open or high resistance between suspect heated seat module harness connector C2 terminals "C" (Light Blue wire for left seat, Orange wire for right seat) and "D" (Dark Blue wire for left seat, Pink wire for right seat). (Scheme 8) If problem does not exist, go to step 25. If problem exists, repair Light Blue wire, Orange wire, Dark Blue wire or Pink wire as necessary. After repair, go to step 42.
17. Inspect heated seat element supply voltage circuit and heated seat element control circuit between suspect heated seat module harness connector terminals "A" (Gray wire for left seat, Dark Green wire for right seat) and "B" ( Brown wire for left seat, Light Green wire for right seat). (Scheme 8) If problem does not exist, go to step 30. If problem exists, repair Gray wire, Dark Green wire, Brown wire or Light Green wire as necessary. After repair, go to step 42.
18. Inspect left heated seat switch signal circuit for an open or short to voltage between Rear Integration Module (RIM) harness connector C1 terminal A5 (Light Green wire) and left rear heated seat module harness connector terminal "C" (Pink wire). (Scheme 8)and (Scheme 10). Inspect right heated seat switch signal circuit for an open or short to voltage between RIM harness connector C1 terminal A6 (Gray wire) and right rear heated seat module harness connector terminal "C" (Brown wire). If problem does not exist, go to step 32. If problem exists, repair Light Green wire, Pink wire, Gray wire or Brown wire as necessary. After repair, go to step 42.
19. Inspect left rear heated seat switch signal circuit for a short to ground between left rear heated seat module harness connector terminal "C" (Pink wire) and RIM harness connector C1 terminal A5 (Light Green wire). Inspect right rear heated seat switch signal circuit for a short ground between right rear heated seat module harness connector terminal "C" (Brown wire) and RIM harness connector C1 terminal A6 (Gray wire). (Scheme 8)and (Scheme 10). If problem does not exist, go to step 32. If problem exists, repair Pink wire, Light Green wire, Brown wire or Gray wire as necessary. After repair, go to step 42.
20. Inspect heated seat element supply voltage circuit and heated seat element control circuit for a short to ground between suspect heated seat module harness connector terminals C2 "A" (Gray wire for left seat, Dark Green wire for right seat) and "B" (Brown wire for left seat, Light Green wire for right seat). If problem does not exist, go to next step. If problem exists, repair Gray wire, Dark Green wire, Brown wire or Light Green wire as necessary. After repair, go to step 42.
21. Inspect heated seat element supply voltage circuit and heated seat element control circuit for a short to voltage between suspect heated seat module harness connector terminals C2 "A" (Gray wire for left seat, Dark Green wire for right seat) and "B" (Brown wire for left seat, Light Green wire for right seat). If problem does not exist, go to next step. If problem exists, repair Gray wire, Dark Green wire, Brown wire or Light Green wire as necessary. After repair, go to step 42.
22. Inspect heated seat element supply voltage circuit and heated seat element control circuit for a short to ground between suspect heated seat module harness connector C3 terminals "A" an "B". If problem does not exist, go to next step. If problem exists, repair heated seat element supply voltage circuit or heated seat element control circuit as necessary. After repair, go to 42.
23. Inspect heated seat element supply voltage circuit and heated seat element control circuit for a short to voltage between suspect heated seat module harness connector C3 terminals "A" an "B". If problem does not exist, go to next step. If problem exists, repair heated seat element supply voltage circuit or heated seat element control circuit as necessary. After repair, go to 42.
24. Inspect temperature sensor signal circuit for a short to ground between suspect heated seat module harness connector C2 terminals "C" (Light Blue wire for left seat, Light Green wire for right seat) and "D" (Dark Blue wire for left seat, Pink wire for right seat). If problem does not exist, go to step 28. If problem exists, repair Light Blue wire, Light Green wire, Dark Blue wire or Pink wire as necessary. After repair, go to step 42.
25. Inspect temperature sensor signal circuit for a short to voltage between suspect heated seat module harness connector C2 terminals "C" (Light Blue wire for left seat, Light Green wire for right seat) and "D" (Dark Blue wire for left seat, Pink wire for right seat). (Scheme 8) If problem does not exist, go to step 30. If problem exists, repair Light Blue wire, Light Green wire, Dark Blue wire or Pink wire as necessary. After repair, go to step 42.
26. Inspect Yellow wire for a short to ground between suspect heated seat module harness connector C1 terminal "H" and RIM harness connector C1 terminal D5. (Scheme 8)and (Scheme 10). If problem does not exist, go to step 32. If problem exists, repair Yellow wire as necessary. After repair, go to step 42.
27. Inspect suspect heated seat switch harness connector for poor connections. If problem does not exist, go to step 36. If problem exists, repair suspect heated seat switch harness connector as necessary. After repair, go to step 42.
28. Inspect suspect heated seat module harness connector for poor connections. If problem does not exist, go to step 37. If problem exists, repair suspect heated seat module harness connector as necessary. After repair, go to step 42.
29. Inspect suspect heated seat back heating element for poor connections. If problem does not exist, go to step 38. If problem exists, repair suspect heated seat back heating element as necessary. After repair, go to step 42.
30. Inspect suspect seat cushion heating element and temperature sensor for poor connections. If problem does not exist, go to step 39. If problem exists, repair suspect seat cushion heating element and/or temperature sensor as necessary. After repair, go to step 42.
31. Inspect suspect door module harness connector for poor connections. If problem does not exist, go to step 40. If problem exists, repair suspect door module harness connector as necessary. After repair, go to step 42.
32. Inspect RIM harness connector for poor connections. If problem does not exist, go to step 41. If problem exists, repair RIM harness connector as necessary. After repair, go to step 42.
33. Repair open or short to ground in Orange wire between suspect heated seat module and rear fuse block. Replace appropriate fuse. After repair, go to step 42.
34. Repair open in Brown wire between suspect heated seat module and rear fuse block. After repair, go to step 42.
35. Repair open in Black wire between ground and suspect heated seat module. Ground point is located below left side of rear seat. After repair, go to step 42.
36. Replace suspect heated seat switch. After repair, go to step 42.
37. Replace suspect heated seat module. After repair, go to step 42.
38. Replace suspect seat back heating element. After repair, go to step 42.
39. Replace suspect seat cushion heating element/temperature sensor. After repair, go to step 42.
40. Replace suspect door module. After repair, go to step 42.
41. Replace RIM, then go to next step.
42. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST D: HEATED SEAT ALWAYS ON - REAR

1. Review heated seat operation. See «HEATED SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__heated-seats) under DESCRIPTION & OPERATION. After review, go to next step.
2. If heated seat system does not operate as described, go to next step. If heated seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Turn ignition switch to OFF position. Disconnect suspect rear heated seat switch Black 5-pin harness connector. Turn ignition switch to RUN position. If suspect seat does not cool down, go to next step. If suspect seat cools down, go to step 8.
4. Turn ignition switch to OFF position. Disconnect suspect door module Black 20-pin harness connector C1. Turn ignition switch to RUN position. If suspect seat does not cool down, go to next step. If suspect seat cools down, go to step 6.
5. Turn ignition switch to OFF position. Disconnect Rear Integration Module (RIM) Gray 16-pin harness connector C1. Turn ignition switch to RUN position. If suspect seat does not cool down, go to step 7. If suspect seat cools down, go to step 10.
6. Inspect Brown wire for a short to ground between suspect door module harness connector terminals No. 10 (Tan/White wire for left seat, Black/White wire for right seat) and 14. (Scheme 11) If problem does not exist, go to step 9. If problem exists, repair Brown wire as necessary. After repair, go to step 15.
7. Inspect suspect heated seat module harness connector for poor connections. If problem does not exist, go to step 11. If problem exists, repair suspect heated seat module harness connector as necessary. After repair, go to step 15.
8. Inspect suspect heated seat switch harness connector for poor connections. If problem does not exist, go to step 12. If problem exists, repair suspect heated seat switch harness connector as necessary. After repair, go to step 15.
9. Inspect suspect door module harness connector for poor connections. If problem does not exist, go to step 13. If problem exists, repair suspect door module harness connector as necessary. After repair, go to step 15.
10. Inspect RIM harness connector for poor connections. If problem does not exist, go to step 14. If problem exists, repair, RIM harness connector as necessary. After repair, go to step 15.
11. Replace suspect heated seat module. After repair, go to step 15.
12. Replace suspect rear heated seat switch. After repair, go to step 15.
13. Replace suspect door module. After repair, go to step 15.
14. Replace RIM. Program RIM. See «REAR INTEGRATION MODULE»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__rear-integration-module) under PROGRAMMING. After repair, go to next step.
15. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST E: HEATED SEAT SWITCH LO INDICATOR INOPERATIVE - FRONT

1. Review heated seat operation. See «HEATED SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__heated-seats) under DESCRIPTION & OPERATION. After review, go to next step.
2. If heated seat switch LO indicator does not operate as described, go to next step. If heated seat switch LO indicator operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Turn ignition switch to RUN position. If LO indicator is always on, go to next step. If LO indicator is not always on, go to step 6.
4. Disconnect suspect heated seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between ground and suspect heated seat switch harness connector terminal "D" (Black wire). Momentarily connect a test light between battery voltage and suspect heated seat switch harness connector terminal "A" (Light Blue wire for left seat, Tan wire for right seat). (Scheme 9) If LO indicator illuminates, go to next step. If LO indicator does not illuminate, go to step 9.
5. Inspect LO indicator control circuit for an open or short to ground between suspect heated seat switch harness connector terminal "A" (Light Blue wire for left seat, Tan wire for right seat) and suspect heated seat module harness connector C1 terminal "D". (Scheme 8)and (Scheme 9). If problem does not exist, go to step 8. If problem exists, repair Light Blue wire or Tan wire as necessary. After repair, go to step 12.
6. Inspect LO indicator control circuit for a short to voltage between suspect heated seat switch harness connector terminal "A" (Light Blue wire for left seat, Tan wire for right seat) and suspect heated seat module harness connector C1 terminal "D". (Scheme 8)and (Scheme 9). If problem does not exist, go to next step. If problem exists, repair Light Blue wire or Tan wire as necessary. After repair, go to step 12.
7. Inspect Black wire for an open between ground and suspect heated seat module harness connector C1 terminal "E". Ground point is located below right front seat. If problem does not exist, go to next step. If problem exists, repair Black wire as necessary. After repair, go to step 12.
8. Inspect suspect heated seat module harness connector for poor connections. If problem does not exist, go to step 10. If problem exists, repair suspect heated seat module harness connector as necessary. After repair, go to step 12.
9. Inspect suspect heated seat switch harness connector for poor connections. If problem does not exist, go to step 11. If problem exists, repair suspect heated seat switch harness connector as necessary. After repair, go to step 12.
10. Replace suspect heated seat module. After repair, go to step 12.
11. Replace suspect heated seat switch. After repair, go to next step.
12. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST F: HEATED SEAT SWITCH LO INDICATOR INOPERATIVE - REAR

1. Review heated seat operation. See «HEATED SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__heated-seats) under DESCRIPTION & OPERATION. After review, go to next step.
2. If heated seat switch LO indicator does not operate as described, go to next step. If heated seat switch LO indicator operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Turn ignition switch to RUN position. If LO indicator is not always on, go to next step. If LO indicator is always on, go to step 6.
4. Disconnect suspect heated seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between ground and suspect heated seat switch harness connector terminal "D" (Tan/White wire for left seat, Black/White wire for right seat). Momentarily connect a test light between battery voltage and suspect heated seat switch harness connector terminal "A" (Pink wire). (Scheme 9) If LO indicator illuminates, go to next step. If LO indicator does not illuminate, go to step 8.
5. Inspect Pink wire for an open or short to ground between suspect heated seat switch harness connector terminal "A" and suspect door module harness connector C1 terminal No. 13. (Scheme 8)and (Scheme 9). If problem does not exist, go to step 7. If problem exists, repair Pink wire as necessary. After repair, go to step 11.
6. Inspect Pink wire for a short to voltage between suspect heated seat switch harness connector terminal "A" and suspect door module harness connector C1 terminal No. 13. (Scheme 9)and (Scheme 11). If problem does not exist, go to next step. If problem exists, repair Pink wire as necessary. After repair, go to step 11.
7. Inspect suspect door module harness connector for poor connections. If problem does not exist, go to step 9. If problem exists, repair suspect door module harness connector as necessary. After repair, go to step 11.
8. Inspect suspect heated seat switch harness connector for poor connections. If problem does not exist, go to step 10. If problem exists, repair suspect heated seat switch as necessary. After repair, go to step 11.
9. Replace suspect door module. After repair, go to step 11.
10. Replace suspect heated seat switch. After repair, go to next step.
11. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST G: HEATED SEAT SWITCH HI INDICATOR INOPERATIVE - FRONT

1. Review heated seat operation. See «HEATED SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__heated-seats) under DESCRIPTION & OPERATION. After review, go to next step.
2. If heated seat switch HI indicator does not operate as described, go to next step. If heated seat switch HI indicator operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Turn ignition switch to RUN position. If HI indicator is always on, go to next step. If HI indicator is not always on, go to step 6.
4. Disconnect suspect heated seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between ground and suspect heated seat switch harness connector terminal "D" (Black wire). Momentarily connect a test light between battery voltage and suspect heated seat switch harness connector terminal "B" (Dark Green wire for left seat, Yellow wire for right seat). (Scheme 9) If HI indicator illuminates, go to next step. If HI indicator does not illuminate, go to step 9.
5. Inspect HI indicator control circuit for an open or short to ground between suspect heated seat switch harness connector terminal "B" (Dark Green wire for left seat, Yellow wire for right seat) and suspect door module harness connector C1 terminal No. 12. (Scheme 9)and (Scheme 11). If problem does not exist, go to step 8. If problem exists, repair Dark Green wire or Yellow wire as necessary. After repair, go to step 12.
6. Inspect HI indicator control circuit for a short to voltage between suspect heated seat switch harness connector terminal "B" (Dark Green wire for left seat, Yellow wire for right seat) and suspect door module harness connector C1 terminal No. 12. (Scheme 9)and (Scheme 11). If problem does not exist, go to next step. If problem exists, repair Dark Green wire or Yellow wire as necessary. After repair, go to step 12.
7. Inspect Black wire for an open between ground and suspect heated seat module harness connector C1 terminal "E". Ground point is located below right front seat. If problem does not exist, go to next step. If problem exists, repair Black wire as necessary. After repair, go to step 12.
8. Inspect suspect heated seat module harness connector for poor connections. If problem does not exist, go to step 10. If problem exists, repair suspect heated seat module harness connector as necessary. After repair, go to step 12.
9. Inspect suspect heated seat switch harness connector for poor connections. If problem does not exist, go to step 11. If problem exists, repair suspect heated seat switch harness connector as necessary. After repair, go to step 12.
10. Replace suspect heated seat module. After repair, go to step 12.
11. Replace suspect heated seat switch. After repair, go to next step.
12. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST H: HEATED SEAT SWITCH HI INDICATOR INOPERATIVE - REAR

1. Review heated seat operation. See «HEATED SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__heated-seats) under DESCRIPTION & OPERATION. After review, go to next step.
2. If heated seat switch HI indicator does not operate as described, go to next step. If heated seat switch HI indicator operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Turn ignition switch to RUN position. If HI indicator is always on, go to next step. If HI indicator is not always on, go to step 6.
4. Disconnect suspect heated seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between ground and suspect heated seat switch harness connector terminal "D" (Tan/White wire for left seat, Black/White wire for right seat). Momentarily connect a test light between battery voltage and suspect heated seat switch harness connector terminal "B" (Black/White wire). (Scheme 9) If HI indicator illuminates, go to next step. If HI indicator does not illuminate, go to step 8.
5. Inspect Black/White wire for an open or short to ground between suspect heated seat switch harness connector terminal "B" and suspect door module harness connector C1 terminal No. 12. (Scheme 9)and (Scheme 11). If problem does not exist, go to step 7. If problem exists, repair Black/White wire as necessary. After repair, go to step 11.
6. Inspect Black/White wire for a short to voltage between suspect heated seat switch harness connector terminal "B" and suspect door module harness connector C1 terminal No. 12. (Scheme 9)and (Scheme 11). If problem does not exist, go to next step. If problem exists, repair Black/White wire as necessary. After repair, go to step 11.
7. Inspect suspect door module harness connector for poor connections. If problem does not exist, go to step 9. If problem exists, repair suspect door module harness connector as necessary. After repair, go to step 11.
8. Inspect suspect heated seat switch harness connector for poor connections. If problem does not exist, go to step 10. If problem exists, repair suspect heated seat switch harness connector as necessary. After repair, go to step 11.
9. Replace suspect door module. After repair, go to step 11.
10. Replace suspect heated seat switch. After repair, go to next step.
11. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST I: POWER SEAT INOPERATIVE - WITHOUT MEMORY

1. Review operation of power seats. See «POWER SEAT SYSTEM»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under DESCRIPTION & OPERATION. After review, go to next step.
2. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. If other power seat does not operate correctly, go to next step. If other power seat operates correctly, go to step 5.
4. Inspect PWR SEAT circuit breaker for continuity. PWR SEAT circuit breaker is located in rear fuse block. If continuity exists, go to step 8. If continuity does not exist, go to step 9.
5. Measure voltage between ground and suspect seat adjuster switch harness connector terminal "J" (Orange wire) for left seat, "P" (Orange wire) for right seat. (Scheme 12) Voltage should be 9-16 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 10.
6. Measure voltage between suspect seat adjuster switch harness connector terminals "J" (Orange wire) and "L" (Black wire) for left seat, "P" (Orange wire ) and "S" (Black wire) for right seat. Voltage should be 9-16 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 11.
7. Inspect suspect seat adjuster switch harness connector for poor connections. If problem does not exist, go to step 14. If problem exists, repair suspect seat adjuster switch harness connector as necessary. After repair, go to step 15.
8. Inspect rear fuse block for poor connections. If problem does not exist, go to step 13. If problem exists, repair rear fuse block as necessary. After repair, go to step 15.
9. Repair short to ground in Orange wire between rear fuse block and suspect seat adjuster switch. After repair, go to step 15.
10. Repair open in Orange wire between rear fuse block and suspect seat adjuster switch. After repair, go to step 15.
11. Repair open in Black wire between ground and suspect seat adjuster switch. Ground point is located below right front seat. After repair, go to step 15.
12. Replace PWR SEAT circuit breaker. After repair, go to step 15.
13. Replace rear fuse block. After repair, go to step 15.
14. Replace suspect seat adjuster switch. After repair, go to next step.
15. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

Scheme 12

TEST J: POWER SEAT INOPERATIVE - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Operate left seat switch in all directions, including lumbar positions. If power seat system does not operate, go to next step. If power seat operates, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe any one of seat directional parameters in Memory Seat Module (MSM) data list. Using left seat switch, activate power seat in direction of observed parameter. If seat parameter does not change state, go to next step. If seat parameter changes state, go to step 7.
4. Using a test light connected to ground, backprobe MSM harness connector for any one seat switch signal circuits. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Using left seat switch, activate power seat to appropriate direction of MSM backprobe. If test light does not illuminate, go to next step. If test light illuminates, go to step 7.
5. Using a test light connected to ground, backprobe left seat switch harness connector terminal "J" (Orange wire). (Scheme 12) If test light illuminates, go to next step. If test light does not illuminate, go to step 8.
6. Inspect left seat switch harness connector for poor connections. If problem does not exist, go to step 9. If problem exists, repair left seat switch harness connector as necessary. After repair, go to step 11.
7. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 10. If problem exists, repair MSM harness connector as necessary. After repair, go to step 11.
8. Repair open or short to ground in Orange wire between left seat switch and rear fuse block. Replace MEM T&T fuse. After repair, go to step 11.
9. Replace left seat switch. After repair, go to step 11.
10. Replace MSM, then go to next step.
11. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST K: POWER SEAT DOES NOT MOVE FORWARD/REARWARD - WITHOUT MEMORY

1. Review operation of power seats. See «POWER SEAT SYSTEM»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under DESCRIPTION & OPERATION. After review, go to next step.
2. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Using a test light connected to ground, backprobe suspect seat horizontal motor harness connector Light Green wire terminal. Operate suspect power seat to REARWARD position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
4. Using a test light connected to ground, backprobe suspect seat horizontal motor harness connector Tan wire terminal. Operate suspect power seat to FORWARD position. If test light illuminates, go to next step. If test light does not illuminate, go to step 7 .
5. Disconnect suspect seat horizontal motor Natural 2-pin harness connector. Connect a test light between suspect horizontal motor harness connector Light Green wire and Tan wire terminals. Operate suspect power seat to FORWARD and REARWARD positions. If test light does not illuminate in both positions, go to step 8 . If test light illuminates in both positions, go to step 9 .
6. Inspect Light Green wire for an open between suspect seat adjuster switch harness connector and suspect seat horizontal motor harness connector. If problem does not exist, go to step 8 . If problem exists, repair Light Green wire as necessary. After repair, go to step 12 .
7. Inspect Tan wire for an open between suspect seat adjuster switch harness connector and suspect seat horizontal motor harness connector. If problem does not exist, go to next step. If problem exists, repair Tan wire as necessary. After repair, go to step 12 .
8. Inspect suspect seat adjuster switch harness connector for poor connections. If problem does not exist, go to step 10 . If problem exists, repair suspect seat adjuster switch harness connector as necessary. After repair, go to step 12 .
9. Inspect suspect seat horizontal motor harness connector for poor connections. If problem does not exist, go to step 11 . If problem exists, repair suspect seat horizontal motor harness connector as necessary. After repair, go to step 12 .
10. Replace suspect seat adjuster switch. After repair, go to step 12 .
11. Replace suspect seat horizontal motor. After repair, go to next step.
12. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2 .

TEST L: POWER SEAT DOES NOT MOVE FORWARD/REARWARD - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Verify that seat does not move forward/rearward. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe seat forward parameter in Memory Seat Module (MSM) data list. Using left seat switch, operate power seat to FORWARD position. If seat forward parameter changes state, go to next step. If seat forward parameter does not change state, go to step 6.
4. Using scan tool, observe seat rearward parameter. Using left seat switch, operate power seat to REARWARD position. If seat rearward parameter changes state, go to next step. If seat rearward parameter does not change state, go to step 7.
5. Disconnect left forward/back motor Natural 2-pin harness connector. Connect a test light between left forward/back motor harness connector Light Green wire and Tan wire terminals. Operate power seat to FORWARD and REARWARD positions. If test light does not illuminate in both positions, go to step 8. If test light illuminates in both positions, go to step 14.
6. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "E" (Tan wire) and "J" (Orange wire). (Scheme 12) Using scan tool, observe seat forward parameter. If seat forward parameter does not change state, go to step 10. If seat forward parameter changes state, go to step 13.
7. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "B" (Light Green wire) and "J" (Orange wire). (Scheme 12) Using scan tool, observe seat rearward parameter. If seat rearward parameter does not change state, go to step 11. If seat rearward parameter changes state, go to step 13.
8. Inspect Tan wire for an open or short to ground between MSM harness connector C3 terminal "N" and left forward/back motor harness connector. If problem does not exist, go to next step. If problem exists, repair Tan wire as necessary. After repair, go to step 18.
9. Inspect Light Green wire for an open or short to ground between MSM harness connector C3 terminal "S"and left forward/back motor harness connector. (Scheme 13) If problem does not exist, go to step 12. If problem exists, repair Light Green wire as necessary. After repair, go to step 18.
10. Inspect Tan wire for an open between left seat switch harness connector terminal "E" and MSM harness connector C2 terminal C5. (Scheme 5)and (Scheme 12). If problem does not exist, go to step 12. If problem exists, repair Tan wire as necessary. After repair, go to step 18.
11. Inspect Light Green wire for an open between left seat switch harness connector terminal "B" and MSM harness connector C2 terminal C6. (Scheme 5)and (Scheme 12). If problem does not exist, go to next step. If problem exists, repair Light Green wire as necessary. After repair, go to step 18.
12. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 18.
13. Inspect left seat switch harness connector for poor connections. If problem does not exist, go to step 16. If problem exists, repair left seat switch harness connector as necessary. After repair, go to step 18.
14. Inspect forward/back motor harness connector for poor connections. If problem does not exist, go to step 17. If problem exists, repair forward/back motor harness connector as necessary. After repair, go to step 18.
15. Replace MSM, then go to step 18.
16. Replace left seat switch. After repair, go to step 18.
17. Replace forward/back motor. After repair, go to next step.
18. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

Scheme 13

TEST M: POWER SEAT DOES NOT TILT FORWARD - WITHOUT MEMORY

1. Review operation of power seats. See «POWER SEAT SYSTEM»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under DESCRIPTION & OPERATION. After review, go to next step.
2. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Using a test light connected to ground, backprobe suspect seat front vertical motor harness connector Dark Green wire terminal. Operate power seat front tilt to UP position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
4. Using a test light connected to ground, backprobe suspect seat front vertical motor harness connector Dark Blue wire terminal. Operate power seat front tilt to DOWN position. If test light illuminates, go to next step. If test light does not illuminate, go to step 7 .
5. Disconnect suspect seat front vertical motor harness connector. Connect a test light between suspect seat front vertical motor harness connector Dark Green wire and Dark Blue wire terminals. Operate suspect power seat front tilt to UP and DOWN positions. If test light does not illuminate in both positions, go to step 8 . If test light illuminates in both positions, go to step 9 .
6. Inspect Dark Green wire for an open between suspect seat front vertical motor harness connector and suspect seat adjuster switch harness connector. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to step 8 . If problem exists, repair Dark Green wire as necessary. After repair, go to step 12 .
7. Inspect Dark Blue wire for an open between suspect seat front vertical motor harness connector and suspect seat adjuster switch harness connector. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to next step. If problem exists, repair Dark Blue wire as necessary. After repair, go to step 12 .
8. Inspect suspect seat adjuster switch harness connector for poor connections. If problem does not exist, go to step 10 . If problem exists, repair suspect seat adjuster switch harness connector as necessary. After repair, go to step 12 .
9. Inspect suspect front vertical motor harness connector for poor connections. If problem does not exist, go to step 11 . If problem exists, repair suspect front vertical motor harness connector as necessary. After repair, go to step 12 .
10. Replace suspect seat adjuster switch. After repair, go to step 12 .
11. Replace suspect front vertical motor. After repair, go to next step.
12. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2 .

TEST N: POWER SEAT DOES NOT TILT FORWARD - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review operation of power seats. See MEMORY SEATS under DESCRIPTION & OPERATION. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe seat front up parameter in Memory Seat Module (MSM) data list. Operate left seat switch front vertical to UP position. If seat front up parameter changes state, go to next step. If seat front up parameter does not change state, go to step 6.
4. Using scan tool, observe seat front down parameter. Operate power seat front vertical to DOWN position. If seat front down parameter changes state, go to next step. If seat front down parameter does not change state, go to step 7.
5. Disconnect front height motor Black 5-pin harness connector. Connect a test light between front height motor harness connector Dark Green wire and Dark Blue wire terminals. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate power seat front vertical to UP and DOWN positions. If test light does not illuminate in both positions, go to step 8. If test light illuminates in both positions, go to step 14.
6. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "D" (Dark Green wire) and "J" (Orange wire). See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Using scan tool, observe seat front up parameter. If seat front up parameter does not change state, go to step 10. If seat front up parameter changes state, go to step 13.
7. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "A" (Dark Blue wire) and "J" (Orange wire). (Scheme 12) Using scan tool, observe seat front down parameter. If seat front down parameter does not change state, go to step 11. If seat front down parameter changes state, go to step 13.
8. Inspect Dark Green wire for an open or short to ground between left front height motor harness connector and MSM harness connector C3 terminal "A". If problem does not exist, go to next step. If problem exists, repair Dark Green wire as necessary. After repair, go to step 18.
9. Inspect Dark Blue wire for an open or short to ground between left front height motor harness connector and MSM harness connector C3 terminal "M". (Scheme 13) If problem does not exist, go to step 12. If problem exists, repair Dark Blue wire as necessary. After repair, go to step 18.
10. Inspect Dark Green wire for an open between left seat switch harness connector terminal "D" and MSM harness connector C2 terminal C1. (Scheme 5)and (Scheme 12). If problem does not exist, go to step 12. If problem exists, repair Dark Green wire as necessary. After repair, go to step 18.
11. Inspect Dark Blue wire for an open between left seat switch harness connector terminal "A" and MSM harness connector C2 terminal C3. (Scheme 5)and (Scheme 12). If problem does not exist, go to next step. If problem exists, repair Dark Blue wire as necessary. After repair, go to step 18.
12. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 18.
13. Inspect left seat switch harness connector for poor connections. If problem does not exist, go to step 16. If problem exists, repair left seat switch as necessary. After repair, go to step 18.
14. Inspect left front height motor harness connector for poor connections. If problem does not exist, go to step 17. If problem exists, repair left front height motor harness connector as necessary. After repair, go to step 18.
15. Replace MSM, then go to step 18.
16. Replace left seat switch. After repair, go to step 18.
17. Replace left front height motor. After repair, go to next step.
18. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST O: POWER SEAT DOES NOT TILT REARWARD - WITHOUT MEMORY

1. Review operation of power seats. See «POWER SEAT SYSTEM»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under DESCRIPTION & OPERATION. After review, go to next step.
2. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Using a test light connected to ground, backprobe suspect rear vertical motor harness connector Yellow wire terminal. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate seat rear vertical motor to UP position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
4. Using a test light connected to ground, backprobe suspect rear vertical motor harness connector Light Blue wire terminal. Operate seat rear vertical motor to DOWN position. If test light illuminates, go to next step. If test light does not illuminate, go to step 7 .
5. Disconnect suspect rear vertical motor Blue 2-pin harness connector. Connect a test light between rear vertical motor harness connector Yellow wire and Light Blue wire terminals. Operate seat rear vertical motor to UP and DOWN positions. If test light does not illuminate in both positions, go to step 8 . If test light illuminates in both positions, go to step 9 .
6. Inspect Yellow wire for an open between suspect rear vertical motor harness connector and suspect seat adjuster switch. If problem does not exist, go to step 8 . If problem exists, repair Yellow wire as necessary. After repair, go to step 12 .
7. Inspect Light Blue wire for an open between suspect rear vertical motor harness connector and suspect seat adjuster switch. If problem does not exist, go to step 8 . If problem exists, repair Light Blue wire as necessary. After repair, go to step 12 .
8. Inspect suspect seat adjuster switch harness connector for poor connections. If problem does not exist, go to step 10 . If problem exists, repair suspect seat adjuster switch harness connector as necessary. After repair, go to step 12 .
9. Inspect suspect rear vertical motor harness connector for poor connections. If problem does not exist, go to step 11 . If problem exists, repair suspect rear vertical motor harness connector as necessary. After repair, go to step 12 .
10. Replace suspect seat adjuster switch. After repair, go to step 12 .
11. Replace suspect rear vertical motor. After repair, go to next step.
12. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2 .

TEST P: POWER SEAT DOES NOT TILT REARWARD - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review operation of power seats. See «MEMORY SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__memory-seats) under DESCRIPTION & OPERATION. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe seat rear up parameter in Memory Seat Module (MSM) data list. Operate power seat rear vertical to UP position. If seat rear up parameter changes state, go to next step. If seat rear up parameter does not change state, go to step 6.
4. Using scan tool, observe seat rear down parameter. Operate power seat rear vertical to DOWN position. If seat rear down parameter changes state, go to next step. If seat rear down parameter does not change state, go to step 7.
5. Disconnect left rear height motor Blue 2-pin harness connector. Connect a test light between left rear height motor harness connector Yellow wire and Light Blue wire terminals. Operate power seat rear vertical to UP and DOWN positions. If test light does not illuminate in both positions, go to step 8. If test light illuminates in both positions, go to step 14.
6. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "F" (Yellow wire) and "J" (Orange wire). (Scheme 12) Using scan tool, observe seat rear up parameter. If seat rear up parameter does not change state, go to step 10. If seat rear up parameter changes state, go to step 13
7. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "C" (Light Blue wire) and "J" (Orange wire). (Scheme 12) Using scan tool, observe seat rear down parameter. If seat rear down parameter does not change state, go to step 11. If seat rear down parameter changes state, go to step 13.
8. Inspect Yellow wire for an open or short to ground between left rear height motor harness connector and MSM harness connector C3 terminal "R". If problem does not exist, go to next step. If problem exists, repair Yellow wire as necessary. After repair, go to step 18.
9. Inspect Light Blue wire for an open or short to ground between left rear height motor harness connector and MSM harness connector C3 terminal "P". If problem does not exist, go to step 12. If problem exists, repair Light Blue wire as necessary. After repair, go to step 18.
10. Inspect Yellow wire for an open between left seat switch harness connector terminal "F" and MSM harness connector C2 terminal C2. If problem does not exist, go to step 12. If problem exists, repair Yellow wire as necessary. After repair, go to step 18.
11. Inspect Light Blue wire for an open between left seat switch harness connector "C" and MSM harness connector C2 terminal C4. If problem does not exist, go to next step. If problem exists, repair Light Blue wire as necessary. After repair, go to step 18.
12. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 18.
13. Inspect left seat switch harness connector for poor connections. If problem does not exist, go to step 16. If problem exists, repair left seat switch harness connector as necessary. After repair, go to step 18.
14. Inspect left rear height motor harness connector for poor connections. If problem does not exist, go to step 17. If problem exists, repair left rear height motor harness connector as necessary. After repair, go to step 18.
15. Replace MSM, then go to step 18.
16. Replace left seat switch. After repair, go to step 18.
17. Replace left rear height motor. After repair, go to next step.
18. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST Q: POWER SEAT DOES NOT RECLINE - WITHOUT MEMORY

1. Review operation of power seats. See «POWER SEAT SYSTEM»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under DESCRIPTION & OPERATION. After review, go to next step.
2. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Using a test light connected to ground, backprobe suspect seat recline motor rearward control circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate suspect seat adjuster switch recline to REARWARD position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
4. Using a test light connected to ground, backprobe suspect seat recline motor forward control circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate suspect seat adjuster switch recline to FORWARD position. If test light illuminates, go to next step. If test light does not illuminate, go to step 7 .
5. Disconnect suspect seat recline motor Black 2-pin harness connector. Connect a test light between suspect seat recline motor harness connector terminals. Operate suspect seat adjuster switch recline to FORWARD and REARWARD positions. If test light does not illuminate in both positions, go to step 8 . If test light illuminates in both positions, go to step 9 .
6. Inspect seat recline rearward control circuit for an open between suspect seat recline motor harness connector and suspect seat adjuster switch harness connector. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to step 8 . If problem exists, repair seat recline rearward control circuit as necessary. After repair, go to step 12 .
7. Inspect seat recline forward control circuit for an open between suspect seat recline motor harness connector and suspect seat adjuster switch harness connector. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to next step. If problem exists, repair seat recline forward control circuit as necessary. After repair, go to step 12 .
8. Inspect suspect seat adjuster switch harness connector for poor connections. If problem does not exist, go to step 10 . If problem exists, repair suspect seat adjuster switch harness connector as necessary. After repair, go to step 12 .
9. Inspect suspect seat recline motor harness connector for poor connections. If problem does not exist, go to step 11 . If problem exists, repair suspect seat recline motor harness connector as necessary. After repair, go to step 12 .
10. Replace suspect seat adjuster switch. After repair, go to step 12 .
11. Replace suspect seat recline motor. After repair, go to next step.
12. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2 .

TEST R: POWER SEAT DOES NOT RECLINE - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review operation of power seats. See «MEMORY SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__memory-seats) under DESCRIPTION & OPERATION. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe seat recline forward parameter in Memory Seat Module (MSM) data list. Operate left seat switch recline to FORWARD position. If seat recline forward parameter changes state, go to next step. If seat recline forward parameter does not change state, go to step 6.
4. Using scan tool, observe seat recline rearward parameter. Operate left seat switch recline to REARWARD position. If seat recline rearward parameter changes state, go to next step. If seat recline rearward parameter does not change state, go to step 7.
5. Disconnect left recline motor Black 2-pin harness connector. Connect a test light between left recline motor harness connector Light Blue wire and Light Green wire terminals. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate left seat switch recline to FORWARD and REARWARD positions. If test light does not illuminate in both positions, go to step 8. If test light illuminates in both positions, go to step 14.
6. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "H" (Light Green wire) and "J" (Orange wire). Using scan tool, observe seat recline forward parameter. If seat recline forward parameter does not change state, go to step 10. If seat recline forward parameter changes state, go to step 13.
7. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "G" (Light Blue wire) and "J" (Orange wire). (Scheme 12) Using scan tool, observe seat recline rearward parameter. If seat recline rearward parameter does not change state, go to step 11. If seat recline rearward parameter changes state, go to step 13.
8. Inspect Light Blue wire for an open or short to ground between left recline motor harness connector and MSM harness connector C3 terminal "G". (Scheme 13) If problem does not exist, go to next step. If problem exists, repair Light Blue wire as necessary. After repair, go to step 18.
9. Inspect Light Green wire for an open or short to ground between left recline motor harness connector and MSM harness connector C3 terminal "F". If problem does not exist, go to step 12. If problem exists, repair Light Green wire as necessary. After repair, go to step 18.
10. Inspect Light Green wire for an open between left seat switch harness connector terminal "H" and MSM harness connector C2 terminal C7. (Scheme 5)and (Scheme 12). If problem does not exist, go to step 12. If problem exists, repair Light Green wire as necessary. After repair, go to step 18.
11. Inspect Light Blue wire for an open between left seat switch harness connector terminal "G" and MSM harness connector C2 terminal C8. (Scheme 5)and (Scheme 12). If problem does not exist, go to next step. If problem exists, repair Light Blue wire as necessary. After repair, go to step 18.
12. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 18.
13. Inspect left seat switch harness connector for poor connections. If problem does not exist, go to step 16. If problem exists, repair left seat switch harness connector as necessary. After repair, go to step 18.
14. Inspect left recline motor harness connector for poor connections. If problem does not exist, go to step 17. If problem exists, repair left recline motor harness connector as necessary. After repair, go to step 18.
15. Replace MSM, then go to step 18.
16. Replace left seat switch. After repair, go to step 18.
17. Replace left recline motor. After repair, go to next step.
18. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST S: POWER HEADREST DOES NOT MOVE UP/DOWN - WITHOUT MEMORY

1. Review operation of power seats. See «POWER SEAT SYSTEM»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under DESCRIPTION & OPERATION. After review, go to next step.
2. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Using a test light connected to ground, backprobe suspect headrest harness connector motor up control circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate headrest to UP position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
4. Using a test light connected to ground, backprobe suspect headrest harness connector motor down control circuit. Operate headrest to DOWN position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
5. Disconnect suspect headrest motor medium Gray 2-pin harness connector. Connect a test light between suspect headrest motor harness connector terminals. Operate headrest to UP and DOWN positions. If test light illuminates in both positions, go to step 7 . If test light does not illuminate in both positions, go to step 8 .
6. Inspect suspect seat adjuster switch harness connector for poor connections. If problem does not exist, go to step 9 . If problem exists, repair suspect seat adjuster switch harness connector as necessary. After repair, go to step 11 .
7. Inspect suspect headrest motor harness connector for poor connections. If problem does not exist, go to step 10 . If problem exists, repair suspect headrest motor harness connector as necessary. After repair, go to step 11 .
8. Repair open in up or down control circuit between suspect seat adjuster switch and headrest motor. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . After repair, go to step 11 .
9. Replace suspect seat adjuster switch. After repair, go to step 11 .
10. Replace suspect headrest motor. After repair, go to next step.
11. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2 .

TEST T: POWER HEADREST DOES NOT MOVE UP/DOWN - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review operation of power seats. See «MEMORY SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__memory-seats) under DESCRIPTION & OPERATION. If power seat system does not operate as described, go to next step. If power seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe headrest up parameter in Memory Seat Module (MSM) data list. Operate left seat switch headrest to UP position. If headrest up parameter changes state, go to next step. If headrest up parameter does not change state, go to step 6.
4. Using scan tool, observe headrest down parameter. Operate left seat switch headrest to DOWN position. If headrest down parameter changes state, go to next step. If headrest down parameter does not change state, go to step 7.
5. Disconnect left headrest motor medium Gray 2-pin harness connector. Connect a test light between left headrest motor harness connector Yellow wire and Purple wire terminals. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate left seat switch headrest to UP and DOWN positions. If test light does not illuminate in both positions, go to step 8. If test light illuminates in both positions, go to step 14.
6. Disconnect left seat switch Black 5-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "K" (White/Black wire) and "J" (Orange wire). (Scheme 12) Using scan tool, observe headrest up parameter. If headrest up parameter does not change state, go to step 10. If headrest up parameter changes state, go to step 13.
7. Disconnect left seat switch Black 2-pin harness connector. Connect a 3-amp fused jumper wire between left seat switch harness connector terminals "M" (Dark Blue/White wire) and "J" (Orange wire). Using scan tool, observe headrest down parameter. If headrest down parameter does not change state, go to step 11. If headrest down parameter changes state, go to step 13.
8. Inspect Yellow wire for an open or short to ground between left headrest motor harness connector and MSM harness connector C3 terminal "J". If problem does not exist, go to next step. If problem exists, repair Yellow wire as necessary. After repair, go to step 18.
9. Inspect Purple wire for an open or short to ground between left headrest motor harness connector and MSM harness connector C3 terminal "H". (Scheme 12) If problem does not exist, go to step 12. If problem exists, repair Purple wire as necessary. After repair, go to step 18.
10. Inspect White/Black wire for an open between left seat switch harness connector terminal "K" and MSM harness connector C2 terminal D9. If problem does not exist, go to step 12. If problem exists, repair White/Black wire as necessary. After repair, go to step 18.
11. Inspect Dark Blue/White wire for an open between left seat switch harness connector terminal "M" and MSM harness connector C2 terminal D10. If problem does not exist, go to next step. If problem exists, repair Dark Blue/White wire as necessary. After repair, go to step 18.
12. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 18.
13. Inspect left seat switch harness connector for poor connections. If problem does not exist, go to step 16. If problem exists, repair left seat switch harness connector as necessary. After repair, go to step 18.
14. Inspect left headrest motor harness connector for poor connections. If problem does not exist, go to step 17. If problem exists, repair left headrest motor harness connector as necessary. After repair, go to step 18.
15. Replace MSM, then go to step 18.
16. Replace left seat switch. After repair, go to step 18.
17. Replace left headrest motor. After repair, go to next step.
18. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST U: MEMORY SEAT FEATURE INOPERATIVE

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review operation of power seats. See «MEMORY SEATS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__memory-seats) under DESCRIPTION & OPERATION. If memory seat system does not operate as described, go to next step. If memory seat system operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, select Dash Integration Module (DIM), special functions, set options then personalization option. Follow on-screen instructions to verify personalization option is activated. If personalization option is activated, go to next step. If personalization option is not activated, program DIM. See DASH INTEGRATION MODULE under PROGRAMMING in BODY CONTROL MODULES - SEVILLE article.
4. Turn headlights on. Using scan tool, observe memory recall switches parameter in Driver's Door Module (DDM) data list. Press MEMORY SET button. If scan tool displays SET, go to next step. If scan tool does not display SET, go to step 8 .
5. Using scan tool, observe memory recall switches parameter. Press MEMORY 1 button. If scan tool displays MEMORY 1, go to next step. If scan tool does not display MEMORY 1, go to step 10 .
6. Using scan tool, observe memory recall switches parameter. Press MEMORY 2 button. If scan tool displays MEMORY 2, go to next step. If scan tool does not display MEMORY 2, go to step 11 .
7. Using scan tool, observe memory recall switch parameter. Press EXIT button. If scan tool does not display EXIT, go to step 16 . If scan tool displays EXIT, go to step 17 .
8. Disconnect memory function switch Gray 6-pin harness connector. Connect a 3-amp fused jumper wire between ground and memory function switch harness connector terminal "C" (Orange wire). See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Using scan tool, observe memory recall switch parameter. If scan tool displays SET, go to next step. If scan tool does not display SET, go to step 12 .
9. Connect a 3-amp fused jumper wire between memory function switch harness connector terminals "C" (Orange wire) and "E" (Black/White wire). Using scan tool, observe memory recall switches parameter. If scan tool displays SET, go to step 16 . If scan tool does not display SET, go to step 18 .
10. Disconnect memory function switch Gray 6-pin harness connector. Connect a 3-amp fused jumper wire between ground and memory function switch harness connector terminal "A" (White wire). See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Using scan tool, observe memory recall switches parameter. If scan tool does not display MEMORY 1, go to step 13 . If scan tool displays MEMORY 1, go to step 16 .
11. Disconnect memory function switch Gray 6-pin harness connector. Connect a 3-amp fused jumper wire between ground and memory function switch harness connector terminal "B" (Purple wire). See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Using scan tool, observe memory recall switches parameter. If scan tool does not display MEMORY 2, go to step 14 . If scan tool displays MEMORY 2, go to step 16 .
12. Inspect Orange wire for an open between memory function switch harness connector terminal "C" and Driver's Door Switch Assembly (DDSA) harness connector terminal No. 4. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to step 15 . If problem exists, repair Orange wire as necessary. After repair, go to step 22 .
13. Inspect White wire for an open between memory function switch harness connector terminal "A" and DDSA harness connector terminal No. 3. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to step 15 . If problem exists, repair White wire as necessary. After repair, go to step 22 .
14. Inspect Purple wire for an open between memory function switch harness connector terminal "B" and DDSA harness connector terminal No. 2. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . If problem does not exist, go to next step. If problem exists, repair Purple wire as necessary. After repair, go to step 22 .
15. Inspect DDSA harness connector for poor connections. If problem does not exist, go to step 19 . If problem exists, repair DDSA harness connector as necessary. After repair, go to step 22 .
16. Inspect memory function switch harness connector for poor connections. If problem does not exist, go to step 20 . If problem exists, repair memory function switch harness connector as necessary. After repair, go to step 22 .
17. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 21 . If problem exists, repair MSM harness connector as necessary. After repair, go to step 22 .
18. Repair open in Black/White wire between memory function switch harness connector terminal "E" and DDM harness connector C1 terminal No. 14. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . After repair, go to step 22 .
19. Replace DDSA, then go to step 22 .
20. Replace memory function switch. After repair, go to step 22 .
21. Replace MSM, then go to next step.
22. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2 .

TEST V: LUMBAR SUPPORT INOPERATIVE - WITHOUT MEMORY

1. Review operation of lumbar support system. See «LUMBAR SUPPORT WITHOUT MEMORY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__lumbar-support-without-memory) under DESCRIPTION & OPERATION. After review, go to next step.
2. If lumbar support does not operate as described, go to next step. If lumbar support operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Measure voltage by backprobing between ground and suspect lumbar switch harness connector terminal "G" (Orange wire). (Scheme 14) Voltage should be 9-16 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 6.
4. Measure voltage by backprobing suspect lumbar switch harness connector terminals "E" (Black wire) and "G" (Orange wire). Voltage should be 9-16 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 7.
5. Inspect suspect lumbar switch harness connector for poor connections. If problem does not exist, go to step 8. If problem exists, repair suspect lumbar switch harness connector as necessary. After repair, go to step 9.
6. Repair open in Orange wire between suspect lumbar switch and rear fuse block. After repair, go to step 9.
7. Repair open in Black wire between ground and suspect lumbar switch. Ground point is located below right front seat. After repair, go to step 9.
8. Replace suspect lumbar switch. After repair, go to next step.
9. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

Scheme 14

TEST W: LUMBAR SUPPORT INOPERATIVE - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review operation of lumbar support. See «LUMBAR SUPPORT WITH MEMORY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__lumbar-support-with-memory) under DESCRIPTION & OPERATION. If lumbar support does not operate as described, go to next step. If lumbar support operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe any one of lumbar directional parameters in Memory Seat Module (MSM) data list. Operate left lumbar switch in direction of observed parameter. If parameter does not change state, go to next step. If parameter changes state, go to step 7.
4. Measure voltage by backprobing between ground and left lumbar switch harness connector terminal "G" (Orange wire). (Scheme 14) Voltage should be 9-16 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 8.
5. Using a test light connected to ground, backprobe any one of lumbar switch signal circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate left lumbar switch to appropriate direction. If test light does not illuminate, go to next step. If test light illuminates, go to step 7.
6. Inspect left lumbar switch harness connector for poor connections. If problem does not exist, go to step 9. If problem exists, repair left lumbar switch harness connector as necessary. After repair, go to step 11.
7. Inspect MSM harness connector C3 for poor connections. If problem does not exist, go to step 10. If problem exists, repair MSM harness connector C3 as necessary. After repair, go to step 11.
8. Repair open in Orange wire between left lumbar switch and rear fuse block. After repair, go to step 11.
9. Replace left lumbar switch. After repair, go to step 11.
10. Replace MSM, then go to next step.
11. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST X: LUMBAR SUPPORT INOPERATIVE - WITH AUTO CONTOUR CONTROL

1. Review operation of lumbar support. See «LUMBAR SUPPORT WITH AUTO CONTOUR CONTROL»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__lumbar-support-with-auto-contour-control) under DESCRIPTION & OPERATION. After review, go to next step.
2. If lumbar support does not operate as described, go to next step. If lumbar support operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Disconnect suspect adaptive lumbar module Black 7-pin harness connector. Adaptive lumbar module is located is respective seat back. Turn ignition switch to RUN position. Using vehicle side of harness connector, measure voltage between ground and suspect adaptive lumbar module harness connector terminal "M" (Brown wire). (Scheme 15) Voltage should be 9-16 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 22.
4. Measure voltage between ground and suspect adaptive lumbar module harness connector terminal "S" (Orange wire). (Scheme 15) Voltage should be 9-16 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 23.
5. Measure voltage between suspect adaptive lumbar module harness connector harness connector terminals "A" (Black wire) and "S" (Orange wire). (Scheme 15) Voltage should be 9-16 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 24.
6. Connect suspect adaptive lumbar module harness connector. Disconnect suspect lumbar switch Black 7-pin harness connector. Measure voltage between ground and suspect lumbar switch harness connector terminal "G" (Orange wire). (Scheme 15) Voltage should be 6-10 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 17.
7. Connect suspect lumbar switch harness connector. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector seat switch signal circuit terminal. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If voltage does not exist at any terminal, go to next step. If any voltage exists at any terminal, go to step 18.
8. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector auto/on circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate suspect lumbar switch to AUTO/ON position. Voltage should be 6-10 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 12.
9. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector off circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate suspect lumbar switch to OFF position. Voltage should be 6-10 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 13.
10. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector rearward signal circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate suspect lumbar switch to REARWARD position. Voltage should be 6-10 volts. If voltage is within specified range, go to next step. If voltage is not within specified range, go to step 14.
11. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector forward signal circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate suspect lumbar switch to FORWARD position. Voltage should be 6-10 volts. If voltage is not within specified range, go to step 15. If voltage is within specified range, go to step 19.
12. Disconnect suspect lumbar switch Black 7-pin harness connector. Connect a 3-amp fused jumper wire between suspect lumbar switch harness connector battery voltage and auto/on circuits. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector auto/on circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Voltage should be 6-10 volts. If voltage is not within specified range, go to step 16. If voltage is within specified range, go to step 20.
13. Disconnect suspect lumbar switch harness connector. Connect a 3-amp fused jumper wire between suspect lumbar switch harness connector battery voltage and off signal circuits. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector off circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Voltage should be 6-10 volts. If voltage is not within specified range, go to step 16. If voltage is not within specified range, go to step 20.
14. Disconnect suspect lumbar switch harness connector. Connect a 3-amp fused jumper wire between suspect switch harness connector battery voltage and rearward signal circuits. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector rearward signal circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Voltage should be 6-10 volts. If voltage is not within specified range, go to step 16. If voltage is within specified range, go to step 20.
15. Disconnect suspect lumbar switch harness connector. Connect a 3-amp fused jumper wire between suspect lumbar switch harness connector battery voltage and forward signal circuits. Measure voltage between ground and backprobing suspect adaptive lumbar module harness connector forward signal circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Voltage should be 6-10 volts. If voltage is not within specified range, go to next step. If voltage is within specified range, go to step 20.
16. Inspect appropriate lumbar switch signal circuit for an open, high resistance or short to ground between suspect adaptive lumbar module and suspect lumbar switch. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If problem does not exist, go to step 19. If problem exists, repair appropriate lumbar switch signal circuit as necessary. After repair, go to step 27.
17. Inspect Orange wire for an open, high resistance or short to ground between suspect lumbar switch and suspect adaptive lumbar module. If problem does not exist, go to step 21. If problem exists, repair Orange wire as necessary. After repair, go to step 27.
18. Inspect lumbar switch signal circuits for a short to voltage between suspect lumbar switch and suspect adaptive lumbar module. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If problem does not exist, go to step 20. If problem exists, repair appropriate lumbar switch signal circuit as necessary. After repair, go to step 27.
19. Perform a mechanical inspection of suspect adaptive lumbar module and bladders for air leaks or restricted air lines. If problem does not exist, go to step 21. If problem exists, repair suspect adaptive lumbar module, bladder and/or air leaks or restriction as necessary. After repair, go to step 27.
20. Inspect suspect lumbar switch harness connector for poor connections. If problem does not exist, go to step 25. If problem exists, repair suspect lumbar switch harness connector as necessary. After repair, go to step 27.
21. Inspect suspect adaptive lumbar module harness connector for poor connections. If problem does not exist, go to step 26. If problem exists, repair suspect adaptive lumbar module harness connector as necessary. After repair, go to step 27.
22. Repair open or short to ground in Brown wire between suspect adaptive lumbar module and rear fuse block. After repair, go to step 27.
23. Repair open or short to ground in Orange wire between suspect adaptive lumbar module and rear fuse block. After repair, go to step 27.
24. Repair open in Black wire between ground and suspect adaptive lumbar module. Ground point is located below right front seat. After repair, go to step 27.
25. Replace suspect lumbar switch. After repair, go to step 27.
26. Replace suspect adaptive lumbar module. After repair, go to next step.
27. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

Scheme 15

TEST Y: LUMBAR SUPPORT DOES NOT MOVE IN/OUT - WITHOUT MEMORY

1. Review operation of lumbar support system. See «LUMBAR SUPPORT WITHOUT MEMORY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__lumbar-support-without-memory) under DESCRIPTION & OPERATION. After review, go to next step.
2. If lumbar support does not operate as described, go to next step. If lumbar support operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Using a test light connected to ground, backprobe suspect lumbar switch harness connector rearward control circuit terminal. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate suspect lumbar switch to REARWARD position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
4. Using a test light connected to ground, backprobe suspect lumbar switch harness connector forward control circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate suspect lumbar switch to FORWARD position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
5. Disconnect suspect lumbar horizontal motor 2-pin harness connector. Connect a test light between suspect lumbar horizontal motor harness connector forward and rearward control circuits. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate suspect lumbar switch to FORWARD and REARWARD positions. If test light illuminates in both positions, go to step 7 . If test light does not illuminate in both positions, go to step 8 .
6. Inspect suspect lumbar switch harness connector for poor connections. If problem does not exist, go to step 9 . If problem exists, repair suspect lumbar switch harness connector as necessary. After repair, go to step 11 .
7. Inspect suspect lumbar horizontal motor harness connector for poor connections. If problem does not exist, go to step 10 . If problem exists, repair suspect lumbar horizontal motor harness connector as necessary. After repair, go to step 11 .
8. Repair open in forward or rearward control circuit between suspect lumbar horizontal motor and suspect lumbar switch. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . After repair, go to step 11 .
9. Replace suspect lumbar switch. After repair, go to step 11 .
10. Replace suspect lumbar horizontal motor. After repair, go to next step.
11. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2 .

TEST Z: LUMBAR SUPPORT DOES NOT MOVE IN/OUT - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review operation of lumbar support. See «LUMBAR SUPPORT WITH MEMORY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__lumbar-support-with-memory) under DESCRIPTION & OPERATION. If lumbar support does not operate as described, go to next step. If lumbar support operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe seat lumbar forward parameter in Memory Seat Module (MSM) data list. Operate left lumbar switch to FORWARD position. If seat lumbar forward parameter changes state, go to next step. If seat lumbar forward parameter does not change state, go to step 6.
4. Using scan tool, observe seat lumbar rearward parameter. Operate left lumbar switch to REARWARD position. If seat lumbar rearward parameter changes state, go to next step. If seat lumbar rearward parameter does not change state, go to step 7.
5. Disconnect left lumbar horizontal motor Black 2-pin harness connector. Connect a test light between left lumbar horizontal motor harness connector Dark Blue wire and Pink wire terminals. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate left lumbar switch to FORWARD and REARWARD positions. If test light does not illuminate in both positions, go to step 8. If test light illuminates in both positions, go to step 14.
6. Disconnect left lumbar switch harness connector. Connect a 3-amp fused jumper wire between left lumbar switch harness connector terminals "A" (Dark Blue wire) and "G" (Orange wire). (Scheme 14) Using scan tool, observe seat lumbar forward parameter. If seat lumbar forward parameter does not change state, go to step 10. If seat lumbar forward parameter changes state, go to step 13.
7. Disconnect left lumbar switch harness connector. Connect a 3-amp fused jumper wire between left lumbar switch harness connector terminals "F" (Yellow wire) and "G" (Orange wire). (Scheme 14) Using scan tool, observe seat lumbar rearward parameter. If seat lumbar rearward parameter does not change state, go to step 11. If seat lumbar rearward parameter changes state, go to step 13.
8. Inspect Dark Blue wire for an open or short to ground between left lumbar horizontal motor harness connector and MSM harness connector C3 terminal "B". See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). If problem does not exist, go to next step. If problem exists, repair Dark Blue wire as necessary. After repair, go to step 18.
9. Inspect Pink wire for an open or short to ground between left lumbar horizontal motor harness connector and MSM harness connector C3 terminal "L". If problem does not exist, go to step 12. If problem exists, repair Pink wire as necessary. After repair, go to step 18.
10. Inspect Dark Blue wire for an open between left lumbar switch harness connector terminal "A" and MSM harness connector C2 terminal C9. (Scheme 5)and (Scheme 14). If problem does not exist, go to step 12. If problem exists, repair Dark Blue wire as necessary. After repair, go to step 18.
11. Inspect Yellow wire for an open between left lumbar switch harness connector terminal "F" and MSM harness connector C2 terminal C10. (Scheme 5)and (Scheme 14). If problem does not exist, go to next step. If problem exists, repair Yellow wire as necessary. After repair, go to step 18.
12. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 18.
13. Inspect left lumbar switch harness connector for poor connections. If problem does not exist, go to step 16. If problem exists, repair left lumbar switch harness connector as necessary. After repair, go to step 18.
14. Inspect left lumbar horizontal motor harness connector for poor connections. If problem does not exist, go to step 17. If problem exists, repair left lumbar horizontal motor harness connector as necessary. After repair, go to step 18.
15. Replace MSM, then go to step 18.
16. Replace left lumbar switch. After repair, go to step 18.
17. Replace left lumbar horizontal motor. After repair, go to next step.
18. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

TEST AA: LUMBAR SUPPORT DOES NOT MOVE UP/DOWN - WITHOUT MEMORY

1. Review operation of lumbar support system. See «LUMBAR SUPPORT WITHOUT MEMORY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__lumbar-support-without-memory) under DESCRIPTION & OPERATION. After review, go to next step.
2. If lumbar support does not operate as described, go to next step. If lumbar support operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
3. Using a test light connected to ground, backprobe suspect lumbar switch motor up control circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate suspect lumbar switch to UP position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
4. Using a test light connected to ground, backprobe suspect lumbar switch harness connector motor down control circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate suspect lumbar switch to DOWN position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
5. Using test light, backprobe between suspect lumbar switch harness connector motor up control circuit and motor down circuit. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Operate suspect lumbar switch to UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, go to step 8 .
6. Inspect suspect lumbar switch harness connector for poor connections. If problem does not exist, go to step 9 . If problem exists, repair suspect lumbar switch harness connector as necessary. After repair, go to step 11 .
7. Inspect suspect lumbar vertical motor harness connector for poor connections. If problem does not exist, go to step 10 . If problem exists, repair suspect lumbar vertical motor harness connector as necessary. After repair, go to step 11 .
8. Repair open in up or down control circuit between suspect lumbar vertical motor harness connector and suspect lumbar switch. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . After repair, go to step 11 .
9. Replace suspect lumbar switch. After repair, go to step 11 .
10. Replace suspect lumbar vertical motor. After repair, go to next step.
11. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2 .

TEST AB: LUMBAR SUPPORT DOES NOT MOVE UP/DOWN - WITH MEMORY

1. If power seat systems diagnostic system check has been performed, go to next step. If power seat systems diagnostic system check has not been performed, perform «POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) under SELF-DIAGNOSTIC SYSTEM.
2. Review operation of lumbar support. See «LUMBAR SUPPORT WITH MEMORY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system__lumbar-support-with-memory) under DESCRIPTION & OPERATION. If lumbar support does not operate as described, go to next step. If lumbar support operates as described, inspect for intermittents. See «TROUBLE SHOOTING»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system).
3. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. Turn ignition switch to RUN position. Using scan tool, observe seat lumbar up parameter in Memory Seat Module (MSM). Operate left lumbar switch to UP position. If seat lumbar up parameter changes state, go to next step. If seat lumbar up parameter does not change state, go to step 6.
4. Using scan tool, observe seat lumbar down parameter. Operate left lumbar switch to DOWN position. If seat lumbar down parameter changes state, go to next step. If seat lumbar down parameter does not change state, go to step 7.
5. Disconnect left lumbar vertical motor Black 2-pin harness connector. Connect a test light between left lumbar vertical motor harness connector Tan wire and Purple wire terminals. See «WIRING DIAGRAMS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Operate left lumbar switch to UP and DOWN positions. If test light does not illuminate in both positions, go to step 8. If test light illuminates in both positions, go to step 14.
6. Disconnect left lumbar switch harness connector. Connect a 3-amp fused jumper wire between left lumbar switch harness connector terminals "B" (White wire) and "G" (Orange wire). (Scheme 14) Using scan tool, observe seat lumbar up parameter. If seat lumbar up parameter does not change state, go to step 10. If seat lumbar up parameter changes state, go to step 13.
7. Disconnect left lumbar switch Black 7-pin harness connector. Connect a 3-amp fused jumper wire between left lumbar switch harness connector terminals "C" (Yellow/Black wire) and "G" (Orange wire). (Scheme 14) Using scan tool, observe seat lumbar down parameter. If seat lumbar down parameter does not change state, go to step 11. If seat lumbar down parameter changes state, go to step 13.
8. Inspect Tan wire for an open or short to ground between left lumbar vertical motor harness connector and MSM harness connector C3 terminal "C". If problem does not exist, go to next step. If problem exists, repair Tan wire as necessary. After repair, go to step 18.
9. Inspect Purple wire for an open or short to ground between left lumbar vertical motor harness connector and MSM harness connector C3 terminal "K". If problem does not exist, go to step 12. If problem exists, repair Purple wire as necessary. After repair, go to step 18.
10. Inspect White wire for an open between left lumbar switch harness connector terminal "B" and MSM harness connector C2 terminal C11. If problem does not exist, go to step 12. If problem exists, repair White wire as necessary. After repair, go to step 18.
11. Inspect Yellow/Black wire for an open between left lumbar switch harness connector terminal "C" and MSM harness connector C2 terminal C12. If problem does not exist, go to next step. If problem exists, repair Yellow/Black wire as necessary. After repair, go to step 18.
12. Inspect MSM harness connector for poor connections. If problem does not exist, go to step 15. If problem exists, repair MSM harness connector as necessary. After repair, go to step 18.
13. Inspect left lumbar switch harness connector for poor connections. If problem does not exist, go to step 16. If problem exists, repair left lumbar switch harness connector as necessary. After repair, go to step 18.
14. Inspect left lumbar vertical motor harness connector for poor connections. If problem does not exist, go to step 17. If problem exists, repair left lumbar vertical motor harness connector as necessary. After repair, go to step 18.
15. Replace MSM, then go to step 18.
16. Replace left lumbar switch. After repair, go to step 18.
17. Replace left lumbar vertical motor. After repair, go to next step.
18. Operate system to verify repair. If system is not operating correctly, repeat test beginning at step 2.

REMOVAL & INSTALLATION

Remove door panel. See DOOR SWITCHES . Door control module is located toward front of door. Disconnect door modules harness connectors. Release tabs at top and bottom of door module and remove. To install, reverse removal procedure.

Removal & Installation (Front/Rear Power Window Switch)

Using small, flat-blade screwdriver's under rear edge of switch panel, depress firmly toward switch plate to disengage retaining clip. Lift upward on rear edge of switch panel. Disconnect harness connectors. Remove switch panel. To install, reverse removal procedure.

Removal & Installation (Memory Function Switch)

Remove inside handle trim cover and screw. Lift flap in pull handle opening to access screws. Remove screws from bottom of door panel. Using door panel clip tool, disengage door panel retainers. Lift upward and pull out to remove door panel. Disconnect door handle cable from inside door handle. Pry on tab while pulling door latch cable back. Unhook collar from cable. Push up to disengage cable from handle clip. (Scheme 16) Disconnect harness connectors. Remove door panel. Remove screws attaching inside door handle to door panel. Remove inside door handle. Using flat-blade tool, release tabs retaining memory function switch. Remove screws from memory function switch. Remove switch. To install, reverse removal procedure.

Scheme 16

Removal & Installation (Horizontal & Vertical)

Remove front seat. See SEAT ASSEMBLY. Remove front seat bottom cushion. See SEAT CUSHIONS & COVERS. If cable has position sensor, remove sensor retaining clip and connector. Squeeze collar of cable to disengage and pull cable back far enough to clear fitting. (Scheme 17) Remove cable or cable/sensor assembly. To install, reverse removal procedure.

Scheme 17

Removal & Installation (Front Seats)

Remove front seat. See SEAT ASSEMBLY . Disconnect harness connectors. Drill out rivets retaining module to bottom of seat. Remove module. To install, reverse removal procedure.

Removal & Installation (Rear Seats)

Remove rear seat back cushion. See SEAT CUSHIONS & COVERS . Modules are located in seat back next to each other. Disconnect harness connectors to heated seat module and remove module from seat back.

Remove seat back cover and pad. See SEAT CUSHIONS & COVERS . Disconnect harness connector from module. Drill out rivets retaining module to front seat back. Remove lumbar module. To install, reverse removal procedure.

Removal & Installation (With Auto Contour Control)

1. Adjust seat to full forward and up position. Remove seat back trim cover by pulling on upper and lower portions of cover to disengage clips. Remove air hose connectors from lumbar module. Remove seat cover "J" channels as necessary to access module wiring.
2. Remove retainers and disconnect main module wiring harness and pull harness from seat frame. Disconnect single air hose and connector coming from lumbar pump motor. Cut straps and remove clips retaining lumbar module to seat frame. To install, reverse removal procedure.

Remove seat back cover and pad. See SEAT CUSHIONS & COVERS . Remove harness connection and vacuum line from pump motor assembly. Remove hog rings attaching motor assembly and bag to rear of seat frame. To install, reverse removal procedure.

Remove driver's front seat. See SEAT ASSEMBLY . Disconnect harness connectors. Drill out rivets retaining Memory Seat Module (MSM) to seat. To install, reverse removal procedure. Install NEW rivets or self-tapping screws to retain MSM to seat bottom.

Remove front seat. See SEAT ASSEMBLY . Remove knobs from seat switch. Remove seat switch trim plate. Pull bottom seat cushion up to expose switch assembly. Use trim pad and garnish clip remover tool and remove switch to bracket fasteners. Release locking tabs on bracket and remove bracket from seat bottom. Remove switch from bracket. Each switch can be serviced individually. Disconnect harness connector. To install, reverse removal procedure.

Remove rear compartment trim panel from trunk. Remove nuts attaching electronics bay board to vehicle. Remove Rear Integration Module (RIM) harness connectors. Remove RIM from electronics bay board. (Scheme 18) To install, reverse removal procedure.

Scheme 18

Move seat to full forward position. Remove seat track retainer bolt trim covers. Remove rear seat track retainer bolts. Move seat to full rearward position. Remove seat track front cover. Recline seat fully rearward. Tilt seat forward to disengage from front mounting points. Disconnect harness connectors. Remove seat. To install, reverse removal procedure. Tighten seat anchor bolts to 30 ft. lbs. (41 N.m).

Removal & Installation (Front Seat Bottom Cushion)

1. Remove front seat. See «SEAT ASSEMBLY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Remove lap belt retractor cover. Remove front seat back trim cover by pulling outward on upper and lower parts of cover. Disconnect heated seat cushion harness connector and/or air lines for adaptive lumbar assembly. Remove clips attaching harness to seat bottom.
2. Turn seat over and remove seat cover "J" retainers from seat bottom cushion. Remove power seat switch. See «POWER SEAT SWITCHES»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Remove nuts attaching seat bottom to adjuster frame. Remove by lifting upward in front and pulling forward to release retainers. To install, reverse removal procedure.

Removal & Installation (Front Seat Back Cushion)

1. Remove front seat. See «SEAT ASSEMBLY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) . Remove trim from rear of seat. Remove 2 seat back cushion cover screws. Using Door Trim Pad Clip Remover (J-38778), remove retainer from center of seat back cushion cover. Remove cover. Remove seat belt retractors. Remove headrest assembly. See «SEAT MOTORS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) .
2. Disable air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Remove side impact air bag. See «SIDE IMPACT AIR»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system) BAG. Disconnect any air lines and/or harness connectors from seat back. Unhook "J" channels retaining seat back cover to frame. Remove cover and pad. To install, reverse removal procedure.

Removal & Installation (Rear Seat Bottom Cushion)

Push in and upward on front of seat cushion bottom. Lift upward and out on seat cushion bottom. Disconnect harness connectors. Remove seat cushion bottom. Remove screws from "J" channels to seat cushion frame. Disengage "J" channels from seat cushion frame. To install, reverse removal procedure.

Removal & Installation (Rear Seat Back Cushion)

1. Remove upper trunk trim panel. Remove retaining clips from remote trunk pass-through release cable. Remove rear seat bottom cushion. Remove center and outer seat belt anchor bolts. Position center shoulder belt clear of seat back. Using a flat-bladed screwdriver, depress seat back retainers. (Scheme 19) Release all 4 retainers and pull seat back away from cross car beam.
2. Disconnect heated seat harness connectors (if equipped). Position rear shoulder belts to clear seat back. Pull seat back forward far enough to pull the pass-through cable through opening. Remove rear seat back. Remove pass-through pocket. Remove hog rings retaining rear seat back cushion to rear seat frame. Remove rear seat back cushion cover. To install, reverse removal procedure.

Scheme 19

Removal & Installation (Recliner Motor)

1. Remove front seat. See «SEAT ASSEMBLY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Remove seat back trim cover. Remove retainer clip from recline motor end of recliner shaft. Slide recliner shaft out of recline motor far enough to clear recliner motor and recliner sensor, if equipped. Disconnect harness connectors for recline motor and recline position sensor, if equipped.
2. Release recline position sensor from recline motor, if equipped. Remove fastener for recliner motor assembly. Remove motor from seat bottom. (Scheme 20) To install, reverse removal procedure.

Scheme 20

Removal & Installation (Horizontal/Vertical Motors)

Motors include forward/back and front/rear height motors. Motors are replaced as a unit along with the seat rail assembly. Remove front seat. See SEAT ASSEMBLY. Remove front seat bottom cushion. See SEAT CUSHIONS & COVERS. Remove rear seat back frame. Disconnect harness connectors. Remove drive cables from motors. See DRIVE CABLES. (Scheme 17) To install, reverse removal procedure. Transfer all necessary components to new seat rail assembly.

Removal & Installation (Headrest Motor)

1. Remove front seat. See «SEAT ASSEMBLY»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Remove seat back trim cover. Remove 2 seat belt post trim covers. Insert small flat-blade tool in top and bottom of headrest support shaft opening. Push in on flat-blade tool to release headrest retaining clips. Remove headrest from support shaft.
2. Remove seat back cushion. See «SEAT CUSHIONS & COVERS»(/cadillac/seville/v-1998-2004/remont/seats/#power-seat-system). Remove seat back frame from seat assembly. Remove block from lower seat frame to allow removal of harness. (Scheme 21)
3. Using small, flat bladed screwdriver, depress retaining tab on headrest power actuator assembly. Feed harness through seat back frame. Grasp headrest power actuator assembly firmly and remove from seat back frame. (Scheme 22) To install, reverse removal procedure.

Scheme 21

Scheme 22

Removal & Installation (Recliner Sensor)

Remove front seat. See SEAT ASSEMBLY . Remove trim from rear of seat. Remove 2 seat back cushion cover screws. Using Door Trim Pad Clip Remover (J-38778), remove retainer from center of seat back cushion cover. Remove cover. Remove retaining clip for recliner shaft. Slide recliner shaft out of recliner motor. Disconnect sensor harness connector. Release sensor from recliner gear case. To install, reverse removal procedure.

Disable air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Remove front seat. See SEAT ASSEMBLY . Remove 2 side impact air bag retaining nuts. Remove side impact air bag assembly and disconnect harness connectors. To install, reverse removal procedure. Tighten side impact air bag retaining nuts to 80 INCH lbs. (9 N.m).

Power Lumbar Seats Wiring Diagram (Seville - With Automatic Contour Lumbar). Scheme 23

Power Lumbar Seats Wiring Diagram (Seville - Without Automatic Contour Lumbar). Scheme 24

Power Headrest, Recliner & 6-Way Seats System Wiring Diagram (Seville). Scheme 25

Power Heated Seat Wiring Diagram (Seville - Front). Scheme 26

Power Heated Seat Wiring Diagram (Seville - Rear). Scheme 27

Power Memory Mirror & Seat System Wiring Diagram (Seville - With Power Lumbar Seats - 1 Of 2). Scheme 28

Power Memory Mirror & Seat System Wiring Diagram (Seville - With Power Lumbar Seats - 2 Of 2). Scheme 29

Power Memory Mirror & Seat System Wiring Diagram (Seville - Without Power Lumbar Seats - 1 Of 2). Scheme 30

Power Memory Mirror & Seat System Wiring Diagram (Seville - Without Power Lumbar Seats - 2 Of 2). Scheme 31

See also:
• SELF-DIAGNOSTIC SYSTEM
• DIAGNOSTIC TROUBLE CODE DEFINITIONS
• CODE ENABLE CRITERIA
• A
• B
• D
• E
• F
• G
• H
• I
• J
• K
• L
• M
• N
• O
• P
• Q
• R
• S
• T
• U
• V
• W
• X
• Y
• Z
• AA
• AB
• HEATED SEATS
• REAR INTEGRATION MODULE
• MEMORY SEATS
• LUMBAR SUPPORT WITHOUT MEMORY
• LUMBAR SUPPORT WITH MEMORY
• LUMBAR SUPPORT WITH AUTO CONTOUR CONTROL