Memory System Cadillac DeVille Concours I final

DESCRIPTION

Note. For additional information about power seats, see appropriate POWER SEATS article. For additional information about power mirrors, see appropriate POWER MIRRORS article.

The memory seat and mirror system allows the driver's seat to be set in 4 preset positions: MEMORY 1, MEMORY 2, EXIT 1 and EXIT 2. The Memory Seat Module (MSM) controls movement of 3 seat position motors, 2 lumbar support motors and one recline motor. The Memory Mirror Module (MMM) controls movement of 2 left mirror motors and 2 right mirror motors. All motors have a position sensor, and work independently of each other. On DeVille, MMM receives manual seat operation inputs from left seat switch. MMM then sends a message over the class 2 serial data line to MSM. MSM then supplies voltage to appropriate seat motors. On Eldorado, MSM receives manual seat operation inputs directly from the left seat switch. MSM then supplies voltage to appropriate seat motors.

REGULAR PRODUCTION OPTION (RPO) CODES (1)

EASY EXIT

An easy exit position may also be recorded for each memorized driver position. Move seat to comfortable exit position. Press SET MEMORY button. A chime will sound. Within 5 seconds, press EXIT button. Memory Mirror Module (MMM) identifies memorized position for last recall or set command, and sends a class 2 message to inform MSM of appropriate set exit command to record. MSM then records feedback voltages of forward/back, rear height, front height and recline position sensors. A single chime will sound to indicate position has been recorded.

MEMORY INHIBIT/ENABLE

Memory Mirror Module (MMM) receives park gear and ignition inputs via class 2 messages. When ignition is off, memory record, memory recall, personalization recall, and exit recall functions are allowed. When ignition is on and gearshift lever is in Park, only personalization recall is deactivated and all other memory functions are allowed. When ignition is on and gearshift is out of Park, memory record is allowed, but all other memory functions are deactivated.

MEMORY RECALL

When MEMORY-1 or MEMORY-2 button is pressed, Memory Mirror Module (MMM) receives input and a single chime is sounded. MMM then applies voltage to mirror motors until feedback voltage of all mirror position sensors equals the appropriate stored feedback voltages. MMM also sends a class 2 message to Memory Seat Module (MSM), which then applies voltage to all seat motors until feedback voltage of all seat position sensors equals the appropriate stored feedback voltages. When EXIT button is pressed, a single chime will sound. MMM identifies driver position of last set or recall command, and sends a class 2 message to MSM. MSM then moves forward/back, rear height, front height, and recline motors until feedback voltage of position sensors equals the appropriate stored feedback voltages.

MEMORY SET

Memory Mirror Module (MMM) receives input from memory function switch. Seat, seatback, lumbar and mirror positions may be recorded for 2 drivers. When SET MEMORY button is pressed, a chime will sound. Within 5 seconds, either MEMORY-1 or MEMORY-2 button must be pressed. When these inputs are received by MMM, the feedback voltages from 4 position sensors is recorded. A single chime will sound to indicate position has been recorded. A class 2 message will also be sent to MSM. MSM then records all feedback voltages from all seat position sensors.

POWER MOTORS

Power seat uses 3 reversible motors that control seat position. Front and back parts of seat are operated by different motors, and can be raised and lowered independently. Third motor controls forward/backward movement. If seat switch is operated to move entire seat up and down, both vertical motors run simultaneously. Recline motor moves angle of seatback. Lumbar support is controlled by an up/down motor and in/out motor. Each power mirror uses an up/down motor and a left/right motor. All motors are reversible, allowing motors to operate movement in each direction.

POSITION SENSORS

Position sensors are used by Memory Seat Module (MSM) and Memory Mirror Module (MMM) to store motor positions in memory and return motors to stored memory positions. Each sensor is a potentiometer, and is mounted to each motor's transmission cable. When cable rotates, resistance of potentiometer varies, and feedback voltage is monitored by MSM or MMM to determine motor position. Feedback voltages vary between 0.25 volt to 4.75 volts. The MSM and MMM store motor positions by recording each position sensor feedback voltage. When a memorized position is requested, each motor is moved until the position sensor feedback voltage equals feedback voltage stored in memory. For easy exit functions, only seat position sensor feedback voltages are recorded and only seat motors operate.

RECALL PERSONALIZATION

When a remote keyless entry transmitter is used to unlock doors, Remote Function Actuator (RFA) sends a class 2 message to inform Memory Mirror Module (MMM) of command and indicate which driver performed the command. When MMM receives an unlock message, 3 personalized recall options are available

1. Recall immediately upon receipt of RFA message.
2. Recall when a key-in message is received using last known driver to record or recall.
3. Do not recall upon receipt of RFA message. Only perform recall functions using memory function switches.
4. Heating Ventilation Air Conditioning (HVAC) personalization messages.
5. Radio personalization messages.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

Scheme 1

Scheme 2

Scheme 3

TROUBLE SHOOTING

Note. Trouble shooting tests are written specifically for use with GM Tech I or Tech II scan tools. Generic scan tool can be used, but may have limited functions.

PRELIMINARY CHECKS

1. Check BATT fuse (10-amp) in trunk compartment fuse block. Check MIRROR fuse (10-amp) in engine compartment fuse/relay center. Check SEATS circuit breaker (30-amp) in left side MaxiFuse(R) Block. Ensure ground connections are clean and tight. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . Check for proper installation of aftermarket electronic equipment.
2. If seat motor internal circuit breaker is tripped, remove voltage from motor to reset. Check for broken or partially broken wire inside of insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. These circuits may be intermittent or resistive when loaded.

MEMORY SEATS SYSTEM CHECK

Note. Perform this check before diagnosing symptoms.

1. Place shift lever in Park position. Operate left seat rear height switch UP and DOWN. Rear of left seat should move up and down. Operate left seat front height switch UP and DOWN. Front of left seat should move up and down. Operate left entire seat switch UP and DOWN. Entire seat should move up and down. Operate left entire seat switch FORWARD and BACKWARD. Entire seat should move forward and back. Operate left recline seat back switch FORWARD and BACKWARD. Left seat back should move forward and backward. If seat does not operate as specified, go to appropriate «POWER SEAT INOPERATIVE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) or «POWER SEAT INOPERATIVE IN ONE DIRECTION»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__power-seat-inoperative-in-one-direction) test procedure under SYSTEM TESTS.
2. Depress No. 1 button on memory function switch. A single chime should sound. Left seat, lumbar support and both outside mirrors should move to positions programmed for driver No. 1. If seat functions properly and mirrors do not operate as specified, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) .
3. Depress No. 2 button on memory function switch. A single chime should sound. Left seat, lumbar support and both outside mirrors should move to positions programmed for driver No. 2. If seat functions properly and mirrors do not operate as specified, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) .
4. Depress EXIT button on memory function switch. Single chime should sound. Left seat moves to exit position programmed for last driver to perform a memory recall or record function. If seat functions properly and mirrors do not operate as specified, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) .
5. Move left seat to desired position. Adjust lumbar support to provide desired support. Adjust both mirrors as desired. Left seat and both mirrors should move as commanded. Press MEMORY 1 button for 3 seconds. Single chime should be heard. Current positions for left seat, lumbar support and both mirrors should store in memory. Adjust seat positions and mirror positions different than positions programmed for appropriate driver. Press MEMORY 1 button on memory function switch. A single chime should be heard. Left seat, lumbar support and both mirrors move to positions programmed for driver No. 1. If seat functions properly and mirrors do not operate as specified, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) .
6. Apply parking brake. Move gear selector lever out of Park position. Press MEMORY 1 button on memory function switch. Left seat, lumbar support, and both mirrors should not move. If memory functions do not operate as specified, see wiring diagram in appropriate SHIFT INTERLOCK SYSTEMS article in WIRING DIAGRAMS.
7. Move gear selector lever to Park position. Press UNLOCK button on driver-1 RKE transmitter. Press unlock button on driver-2 RKE transmitter. Left seat, lumbar support, and both mirrors should perform one of 3 personalized options. If memory functions do not operate as specified, see REMOTE KEYLESS ENTRY SYSTEM CHECK in REMOTE KEYLESS ENTRY SYSTEMS - DEVILLE & ELDORADO article.

OUTSIDE MIRROR SYSTEM CHECK

Note. Perform this check before diagnosing symptoms. If system does not operate as specified in test step, proceed to appropriate diagnosis and testing procedure under SYSTEM TESTS unless specified otherwise.

1. Place mirror select switch in LEFT position. Operate mirror in all directions. Left outside mirror should move as commanded.
2. Place mirror select switch in RIGHT position. Operate mirror in all directions. Right outside mirror should move as commanded.
3. Press MEMORY 1 button. Single beep should be heard and both mirrors should move to programmed position for position No. 1.
4. Press MEMORY 2 button. Single beep should be heard and both mirrors should move to programmed position for position No. 2.
5. Press EXIT button. Left seat should move to programmed position for EXIT for last programmed driver.
6. Turn ignition on. Place shift lever into Reverse position. Right outside mirror should tilt down approximately 7 degrees or to end of travel.

1. Place gear selector lever in Park position. Move left seat lumbar switch to IN and OUT position. Driver seat lumbar support should move in and out. If lumbar support does not move in and out, go to TEST 13: LUMBAR SUPPORT DOES NOT MOVE IN OR OUT under SYSTEM TESTS in POWER SEATS - DEVILLE & ELDORADO article.
2. Move left seat lumbar switch to UP and DOWN positions. Driver seat lumbar support should move up and down. If lumbar support does not move up and down, go to «LUMBAR SUPPORT DOES NOT MOVE UP OR DOWN»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__left-lumbar-support-does-not-move) or «LEFT LUMBAR SUPPORT INOPERATIVE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__left-lumbar-support-inoperative) under SYSTEM TESTS.
3. Depress No. 1 button on memory function switch. A single chime should be heard, driver's seat should move to position programmed memory seat module for No. 1 button. Lumbar support and mirrors may also adjust to different positions set into memory seat module under No. 1 button. If seat does not function as specified, go to «MEMORY SEATS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__memory-seats-system-check) .
4. Depress No. 2 button on memory function switch. A single chime should be heard, driver's seat should move to position programmed into memory seat module for No. 2 button. Lumbar support and mirrors may also adjust to different positions set into memory seat module under No. 2 button. If seat does not function as specified, go to «MEMORY SEATS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__memory-seats-system-check) .
5. Adjust left seat lumbar support to desired position. Lumbar support should move as commanded. Depress MEMORY SET button followed by No. 1 button on memory function switch. Single chime will be heard indicating current lumbar setting as well as seat position and mirror position are stored for No. 1 button. Move left seat lumbar support in all directions. Lumbar support should move as commanded. Depress No. 1 button on memory function switch. Single chime should be heard. Lumbar support should move back to position programmed for No. 1 button. If left seat lumbar support does not respond or memory does not operate as specified, see «MEMORY SEATS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__memory-seats-system-check) .
6. Move gear selector lever to Park position. Depress UNLOCK button on driver-1 RKE transmitter. Depress UNLOCK button on driver-2 RKE transmitter. Driver seat will move to one of 2 programmed exit positions. If driver's seat does not move as specified, see REMOTE KEYLESS ENTRY SYSTEM CHECK in REMOTE KEYLESS ENTRY SYSTEMS - DEVILLE & ELDORADO article.

SELF-DIAGNOSTIC SYSTEM

Note. Diagnostic trouble code tests are written specifically for use with GM Tech I or Tech II scan tools. Generic scan tool can be used, but may have limited functions.

Note. Vehicles with analog instrument panel cluster are equipped with a Climate Control Panel (CCP). Vehicles with digital instrument panel cluster are equipped with a Climate Control Center (CCC). References to CCP also include CCC. CCC and CCP may be referred to as A/C-heater control panel.

Memory Seat Module (MSM) and Memory Mirror Module (MMM) are equipped with a self-diagnostic system, which detects system failures or abnormalities. When a malfunction occurs, MSM or MMM will store a 5-digit alphanumeric Diagnostic Trouble Code (DTC). These codes have been broken up into 2 systems. Memory seat and memory mirrors systems.

After MSM or MMM DTCs have been displayed, service mode can be used to clear DTCs and exit diagnostics or individually perform other tests on different systems. To exit diagnostic mode, press DEFOG or MODE button on CCP, or turn ignition off. DTCs will not be cleared. System will return to normal vehicle operation.

Using Scan Tool

To retrieve DTCs using scan tool, select MSM or MMM data on scan tool. Select DTC function for MSM or MMM. Select HISTORY or CURRENT DTC display function to view corresponding codes.

Using On-Board Diagnostics

To enter diagnostic mode using on-board diagnostics, turn ignition on. Simultaneously press OFF and WARMER (Red bar) buttons on climate control center (digital instrument panel), or OFF and PASSENGER WARMER on climate control panel (analog instrument panel). Pressing LO (fan speed) button will scroll through modules available. Scroll through until PZM? appears. Pressing HI (fan speed) button will scroll through functions of selected module (i.e., MSM or MMM DATA, MSM or MMM INPUTS, MSM or MMM OUTPUTS, etc.). Scroll through until MSM or MMM CODES? appears. Press HI (fan speed) button until all MSM or MMM DTCs appear. Note codes and go to MEMORY SEAT MODULE (MSM) DTCS or MEMORY MIRROR MODULE (MMM) DTCS table. To exit diagnostic mode, press DEFOG or MODE button on CCP, or turn ignition off. DTCs will not be cleared. System will return to normal vehicle operation.

Select MSM or MMM data on scan tool. Select DTC function for MSM or MMM. Select CLEAR CODES function. When prompted, select YES to clear codes.

Clearing DTCS Using On-Board Diagnostics

Turn ignition on. Simultaneously press OFF and WARMER (Red bar) buttons on climate control center (digital instrument panel), or OFF and PASSENGER WARMER on climate control panel (analog instrument panel). Press LO (fan speed) button until MSM or MMM? appears. Press HI (fan speed) button until MSM or MMM CODES? appears. Press LO (fan speed) button until MSM or MMM CODES CLEAR appears. Press HI (fan speed) button until all MSM or MMM CODES CLEAR appears. To exit clear codes mode, press DEFOG or MODE button on CCP, or turn ignition off. If mode is exited before DTCs are cleared, DTCs will not be cleared. System will return to normal vehicle operation.

MEMORY SEAT MODULE (MSM) DTCS

MEMORY MIRROR MODULE (MMM) DTCS

MEMORY SEAT MODULE (MSM) DIAGNOSTIC TESTS

Memory Seat Module (MSM) supplies a 5-volt reference voltage to all seat position sensors using circuit No. 788 (Gray wire). DTC B0846 will set when 5-volt feed voltage is not about 4.6-5.2 volts. When DTC is set, MSM will not allow any memory recall function. Only manual seat movement is allowed, and only one motor can operate at a time. DTC B0846 will clear when 5-volt feed voltage is within a valid operating range during the last monitoring cycle.

Diagnostic Procedure

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition off. Disconnect front vertical position sensor connector. Using DVOM, measure voltage between front vertical position sensor harness connector terminal "B" (Gray wire) and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If about zero volts exists, go to step 6. If about zero volts does not exist, go to next step.
3. If about 12 volts exists, go to step 7. If about 12 volts does not exist, go to next step.
4. Disconnect MSM Natural, 26-pin connector C1. Using DVOM, measure resistance between MSM harness connector C1 terminal No. 13 (Gray wire) and ground. (Scheme 4) If 5 ohms exists, go to next step. If 5 ohms does not exist, go to step 8.
5. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. Go to step 9.
6. Repair short to ground in circuit No. 788 (Gray wire) between position sensor and MSM. Go to step 9.
7. Repair short to voltage in circuit No. 788 (Gray wire) between position sensor and MSM. Go to step 9.
8. Repair open in circuit No. 788 (Gray wire) between MSM and splice S348. Go to next step.
9. Clear DTCs. Reconnect all disconnected connectors. Recheck system operation.

Memory Seat Module (MSM) is supplied battery voltage from SEATS circuit breaker (30-amp) in left MaxiFuse(R) Block using circuit No. 742 (Red wire). This battery voltage is used to operate seat motors. DTC B0856 will set when battery voltage falls out of range of 9.0-15.5 volts. DTC B0856 will clear when dirty battery voltage is within a valid operating range during the last monitoring cycle.

Check battery for proper voltage, and repair or replace as necessary. If battery is okay, repair open or short in circuit No. 742 (Red wire) between MSM and left MaxiFuse(R) Block. Recheck system operation.

Scheme 4

Memory Seat Module (MSM) performs self-tests on its EEPROM. DTC B1656 and B1658 will set when MSM detects a problem with the EEPROM. When DTC B1656 is set, module will store value being written on another block of EEPROM. When DTC B1658 is set, module will use default values for blocks of EEPROM that are corrupt. DTCs will clear when self-test indicates that EEPROM is okay.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition on. Clear any DTCs. Turn ignition off and back on again. Recheck for DTCs. If DTC B1656 or B1658 is still present, go to next step. If DTC is no longer present, go to power seats system check.
3. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
4. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check.

Memory Seat Module (MSM) is supplied battery voltage using circuit No. 1840 (Orange wire). MSM monitors battery voltage to ensure it is in within valid operating range. DTC B1982 will set when battery voltage is greater than 15.5 volts. DTC B1982 will clear when condition for setting the code no longer exists.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition off. Connect scan tool to Data Link Connector (DLC). Select DATA from MSM DATA LIST. If reading is 15.5 volts, go to step 4 . If reading is not 15.5 volts, go to next step.
3. Disconnect MSM Light Green 6-pin connector C2. Using DVOM, measure voltage between MSM connector C2 terminal "D" (Orange wire) and ground. If reading is greater than 15.5 volts, locate and repair problem in charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If reading is not greater than 15.5 volts, go to next step.
4. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
5. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check.

Diagnostic Aids

These DTCs will not allow most other DTCs to set. DTC B1982 may set if vehicle is placed on a battery charger on fast charge for a long period of time.

Memory Seat Module (MSM) is supplied battery voltage using circuit No. 1840 (Orange wire). MSM monitors battery voltage to ensure it is in within valid operating range. DTC B1983 will set when battery voltage is less than 9 volts. When DTC B1983 is set, MSM will not respond to any manual or memory inputs from switches. DTC B1983 will clear when condition for setting the code no longer exists.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition on. Connect scan tool to Data Link Connector (DLC). Select SNAPSHOT from MSM APPLICATION MENU. Trigger snapshot and start engine. Turn engine off and turn ignition back on, engine off. Plot data from snapshot. If reading is greater than 9 volts, go to step 4 . If reading is not greater than 9 volts, go to next step.
3. Disconnect MSM Light Green, 6-pin connector C2. Using DVOM, measure voltage between MSM connector C2 terminal "D" (Orange wire) and ground. If reading is less than 9 volts, locate and repair problem in charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If reading is greater than 9 volts, go to next step.
4. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
5. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check.

These DTCs will not allow most other DTCs to set. DTC B1982 may set if vehicle is placed on a battery charger on fast charge for a long period of time.

DTC B2101: RECLINE AFT SWITCH FAILED, B2102: RECLINE FORWARD SWITCH FAILED, B2103: REAR VERTICAL DOWN SWITCH FAILED, B2104: REAR VERTICAL UP SWITCH FAILED, B2105: HORIZONTAL AFT SWITCH FAILED, B2106: HORIZONTAL FORWARD SWITCH FAILED, B2107: FRONT VERTICAL DOWN SWITCH FAILED OR B2108: FRONT VERTICAL UP SWITCH FAILED

Note. DTCs will only set if B1982 or B1983 are not set as current in Memory Seat Module (MSM).

Memory Seat Module (MSM) receives inputs from left seat switch. When switch is operated, it becomes grounded. The input is recognized by MSM, which moves seat in appropriate direction. If MSM continues to receive input from seat switch for 30 seconds after motion in requested direction has ceased, switch is considered shorted. If a seat position sensor DTC is currently set and switch is in associated direction of suspect sensor for 30 seconds, switch is considered shorted. Appropriate MSM DTC will set when a switch failure is detected. When DTC is set, associated motor outputs of suspect switch will be deactivated. MSM will continue to respond to valid inputs from other manual switches. All memory recall commands will be ignored. DTC will clear when MSM does not detect switch failure during last monitoring cycle.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition on. Connect scan tool to Data Link Connector (DLC). Disconnect left seat switch connector. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to step 5 .
3. Using DVOM, measure voltage between MSM connector C1 terminal corresponding with description of set DTC and ground. See «MEMORY SEAT MODULE TERMINAL IDENTIFICATION»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) table. If battery voltage is indicated at any terminal, go to step 6 . If battery voltage is not indicated at any terminal, go to next step.
4. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to step 7 .
5. Replace left seat switch. See POWER SEATS - DEVILLE & ELDORADO article. Recheck system operation. After repairs, go to step 7 .
6. Repair short to voltage in circuit that battery voltage was measured at. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . After repairs, go to next step.
7. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check.

MEMORY SEAT MODULE TERMINAL IDENTIFICATION (1)

DTC B2109: LUMBAR AFT (IN) SWITCH FAILED OR DTC B2110: LUMBAR FORWARD SWITCH FAILED

Note. DTCs will only set if B1982 or B1983 are not set as current in Memory Seat Module (MSM).

Memory Seat Module (MSM) receives inputs from left lumbar switch. When switch is operated, it becomes grounded. The input is recognized by MSM, which moves lumbar support in appropriate direction. If MSM continues to receive input from lumbar support switch for 30 seconds after motion in requested direction has ceased, switch is considered shorted. If lumbar position sensor DTC is currently set and switch is in associated direction of suspect sensor for 30 seconds, switch is considered shorted. Appropriate MSM DTC will set when a switch failure is detected. When DTC is set, associated motor outputs of suspect switch will be deactivated. MSM will continue to respond to valid inputs from other manual switches. All memory recall commands will be ignored. DTC will clear when MSM does not detect switch failure during last monitoring cycle.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition on. Connect scan tool to Data Link Connector (DLC). Disconnect left lumbar switch connector. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to step 5 .
3. Using DVOM, measure voltage between MSM connector C1 terminal corresponding with description of set DTC and ground. See «MEMORY SEAT MODULE TERMINAL IDENTIFICATION»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) table. If battery voltage is indicated at any terminal, go to step 6 . If battery voltage is not indicated at any terminal, go to next step.
4. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to step 7 .
5. Replace left seat lumbar switch. See POWER SEATS - DEVILLE & ELDORADO article. Recheck system operation. After repairs, go to step 7 .
6. Repair short to voltage in circuit that battery voltage was measured at. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . After repairs, go to next step.
7. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check.

DTC B2111: LUMBAR DOWN SWITCH FAILED (AL2) OR DTC B2112: LUMBAR UP SWITCH FAILED (AL2)

Note. AL2 identifies vehicle as being equipped with 4-way power lumbar seats. DTCs will only set if B1982 or B1983 are not set as current in Memory Seat Module (MSM).

Memory Seat Module (MSM) receives inputs from left lumbar switch. When switch is operated, it becomes grounded. The input is recognized by MSM, which moves lumbar support in up or down direction. If MSM continues to receive input from lumbar support switch for 30 seconds after requested up or down motion has ceased, switch is considered shorted. If lumbar vertical position sensor DTC is currently set and switch is in associated direction of suspect sensor for 30 seconds, switch is considered shorted. Appropriate MSM DTC will set when a switch failure is detected. When DTC is set, lumbar support cannot be moved up or down. MSM will continue to respond to valid inputs from other manual switches. All memory recall commands will be ignored. DTC will clear when MSM does not detect switch failure during last monitoring cycle.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition on. Connect scan tool to Data Link Connector (DLC). Disconnect left lumbar switch connector. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to step 5 .
3. Using DVOM, measure voltage between MSM connector C1 terminal corresponding with description of set DTC and ground. See «MEMORY SEAT MODULE TERMINAL IDENTIFICATION»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) table. If battery voltage is indicated at any terminal, go to step 6 . If battery voltage is not indicated at any terminal, go to next step.
4. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to step 7 .
5. Replace left seat lumbar switch. See POWER SEATS - DEVILLE & ELDORADO article. Recheck system operation. After repairs, go to step 7 .
6. Repair short to voltage in circuit that battery voltage was measured at. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . After repairs, go to next step.
7. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check.

DTC B2111: LUMBAR DOWN SWITCH FAILED (AM3)

Note. AM3 identifies vehicle as being equipped with 2-way power lumbar seats. DTCs will only set if B1982 or B1983 are not set as current in Memory Seat Module (MSM).

Memory Seat Module (MSM) receives inputs from lumbar massage module. Lumbar massage module receives input from left lumbar switch. When switch is operated, it becomes grounded. The input is recognized by MSM, which moves lumbar support in down direction. If MSM continues to receive input from lumbar support switch for 30 seconds after requested down motion has ceased, switch is considered shorted. If lumbar vertical position sensor DTC B2111 is currently set and switch is in associated direction of suspect sensor for 30 seconds, switch is considered shorted. Appropriate MSM DTC B2111 will set when a switch failure is detected. When DTC B2111 is set, lumbar support cannot be moved down. MSM will continue to respond to valid inputs from other manual switches. All memory recall commands will be ignored. DTC B2111 will clear when MSM does not detect switch failure during last monitoring cycle.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition on. Connect scan tool to Data Link Connector (DLC). Disconnect left lumbar switch connector. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to step 5 .
3. Disconnect lumbar massage module connector. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to step 6
4. Check for short to ground in circuit Yellow wire between Memory Seat Module (MSM) connector C1 terminal No. 22 and lumbar massage module connector terminal "R". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . If faulty circuit is found, go to step 9 . If circuit is okay, go to step 10 .
5. Replace left seat lumbar switch. See POWER SEATS - DEVILLE & ELDORADO article. Recheck system operation. After repairs, go to step 11 .
6. Check for short to ground in Yellow wire between lumbar massage module connector terminal "H" and left seat lumbar switch connector terminal "C" (DeVille) or "D" (Eldorado). If faulty circuit is found, go to next step. If circuit is okay, go to step 8 .
7. Repair short to ground in Yellow wire between left seat lumbar switch and lumbar massage module. After repairs, go to step 11 .
8. Replace left lumbar massage module. After repairs, go to step 11 .
9. Repair short to ground in Yellow wire between MSM and lumbar massage module. After repairs, go to step 11 .
10. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
11. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check.

DTC B2112: LUMBAR UP SWITCH FAILED (AM3)

Note. AM3 identifies vehicle as being equipped with 2-way power lumbar seats. DTCs will only set if B1982 or B1983 are not set as current in Memory Seat Module (MSM).

Memory Seat Module (MSM) receives inputs from lumbar massage module. Lumbar massage module receives input from left lumbar switch. When switch is operated, it becomes grounded. The input is recognized by MSM, which moves lumbar support in up direction. If MSM continues to receive input from lumbar support switch for 30 seconds after requested up motion has ceased, switch is considered shorted. If lumbar vertical position sensor DTC B2112 is currently set and switch is in associated direction of suspect sensor for 30 seconds, switch is considered shorted. MSM DTC B2112 will set when a switch failure is detected. When DTC B2112 is set, lumbar support cannot be moved up. MSM will continue to respond to valid inputs from other manual switches. All memory recall commands will be ignored. DTC B2112 will clear when MSM does not detect switch failure during last monitoring cycle.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Turn ignition on. Connect scan tool to Data Link Connector (DLC). Disconnect left lumbar switch connector. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to step 5 .
3. Disconnect lumbar massage module connector. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to step 6
4. Check for short to ground in Red wire between Memory Seat Module (MSM) connector C1 terminal No. 8 and lumbar massage module connector terminal "S". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . If faulty circuit is found, go to step 9 . If circuit is okay, go to step 10 .
5. Replace left seat lumbar switch. See POWER SEATS - DEVILLE & ELDORADO article. Recheck system operation. After repairs, go to step 11 .
6. Check for short to ground in Red wire between lumbar massage module connector terminal "G" and left seat lumbar switch connector terminal "D" (DeVille) or "C" (Eldorado). If faulty circuit is found, go to next step. If circuit is okay, go to step 8 .
7. Repair short to ground in Red wire between left switch and lumbar massage module. After repairs, go to step 11 .
8. Replace left lumbar massage module. After repairs, go to step 11 .
9. Repair short to ground in Red wire between MSM and lumbar massage module. After repairs, go to step 11 .
10. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
11. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check.

Memory Seat Module (MSM) receives inputs from position sensors during memory set, memory recall and easy exit functions. Lumbar support does not move during easy exit function. As motor moves seat, potentiometers in position sensor varies in resistance. MSM receives a variable voltage input depending on resistance of potentiometer. During memory set, MSM records voltage across all seat and lumbar potentiometers. During memory recall, MSM moves motors until voltage across each potentiometer matches stored voltages. During easy exit, MSM moves seat motors until voltages matched stored voltages. During normal operation, position sensors are checked against out-of-range limits. DTC will not set if DTC B1982 or B1983 is current. MSM DTC will set when position sensor out-of-range is detected. MSM will set DTC when it detects the sensor input voltage is out of range (less than 0.25 volt or greater than 4.75 volts). When DTC is set, MSM will disable suspect motor during memory recall and easy exit functions. Motor will remain enabled for manual positioning. DTC will clear when MSM does not detect position sensor failure during last monitoring cycle.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. If any other seat position sensor DTCs are set, go to next step. See «MEMORY SEAT MODULE (MSM) DTCs»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) table under SELF-DIAGNOSTIC SYSTEM. If no other seat position sensor DTCs are set, go to step 9.
3. Disconnect suspect position sensor connector. On recline sensor, rear vertical sensor and forward/back sensor, using DVOM, measure resistance between terminal pins (sensor side) "A" and "D". On front vertical sensor, lumbar in/out sensor and lumbar up/down sensor, using DVOM, measure resistance between terminal pins (sensor side) "B" and "D". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If reading is 9000-11,000 ohms, go to next step. If reading is not 9000-11,000 ohms, go to step 12.
4. On recline sensor, rear vertical sensor and forward/back sensor, using DVOM, measure resistance between terminal pins (sensor side) "A" and "B". On front vertical sensor, lumbar in/out sensor and lumbar up/down sensor, using DVOM, measure resistance between terminal pins (sensor side) "B" and "C". If reading is 500-9500 ohms, go to next step. If reading is not 500-9500 ohms, go to step 12.
5. Disconnect Memory Seat Module (MSM) connector C1. On recline sensor and rear vertical sensor using DVOM, measure resistance of Gray wire between sensor connector terminal "D" and MSM connector C1 terminal No. 13. (Scheme 4) On front vertical sensor using DVOM, measure resistance of Gray wire between sensor connector terminal "B" and MSM connector C1 terminal No. 13. On forward/back sensor using DVOM, measure resistance of Gray wire between sensor connector terminal "A" and MSM connector C1 terminal No. 13. On lumbar in/out sensor and lumbar up/down sensor, using DVOM, measure resistance between sensor connector terminal "D" (Brown wire at lumbar sensors) and MSM connector C1 terminal No. 13 (Gray wire at MSM). If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 13.
6. On recline sensor and rear vertical sensor using DVOM, measure resistance of Black wire between sensor connector terminal "A" and MSM connector C1 terminal No. 12. On lumbar in/out sensor and lumbar up/down sensor, using DVOM, measure resistance between sensor connector terminal "A" (Light Blue wire at sensor) and MSM connector C1 terminal No. 12 (Black wire at MSM). On front vertical sensor and forward/back sensor using DVOM, measure resistance of Black wire between sensor connector terminal "D" and MSM connector C1 terminal No. 12. If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 14.
7. Using DVOM, measure resistance between the corresponding DTC sensor connector terminal and ground: Recline sensor connector terminal "C" (White/Black wire). Front/back sensor connector terminal "C" (Dark Green wire). Rear vertical sensor connector terminal "B" (Tan wire). Front vertical sensor connector terminal "C" (Brown/White wire). Lumbar up/down sensor connector terminal "C" (Light Blue wire). Lumbar in/out sensor connector terminal "C" (Yellow wire). If reading is less than 5 ohms, go to step 15. If reading is greater than 5 ohms, go to next step.
8. Using DVOM, measure resistance between the corresponding DTC sensor connector terminal and MSM connector C1 terminal: White/Black wire between recline sensor connector terminal "C" and MSM connector C1 terminal No. 14. Dark Green wire between front/back sensor connector terminal "C" and MSM connector C1 terminal No. 16. Tan wire between rear vertical sensor connector terminal "B" and MSM connector C1 terminal No. 2. Brown/White wire between front vertical sensor connector terminal "C" and MSM connector C1 terminal No. 15. Light Blue wire between lumbar up/down sensor connector terminal "C" and MSM connector C1 terminal No. 3. Yellow wire between lumbar in/out sensor connector terminal "C" and MSM connector C1 terminal No. 1. If reading is less than 5 ohms in any circuit, go to step 20. If reading is greater than 5 ohms in any circuit, go to step 16.
9. Disconnect suspect position sensor connector. Disconnect Memory Seat Module (MSM) connector C1. Using DVOM, measure resistance between MSM connector C1 terminal No. 13 (Gray wire) and ground. If reading is less than 5 ohms, go to step 17. If reading is greater than 5 ohms, go to next step.
10. Disconnect Memory Seat Module (MSM) connector C1. On recline sensor and rear vertical sensor using DVOM, measure resistance of Gray wire between sensor connector terminal "D" and MSM connector C1 terminal No. 13. (Scheme 4) On front vertical sensor using DVOM, measure resistance of Gray wire between sensor connector terminal "B" and MSM connector C1 terminal No. 13. On forward/back sensor using DVOM, measure resistance of Gray wire between sensor connector terminal "A" and MSM connector C1 terminal No. 13. On lumbar in/out sensor and lumbar up/down sensor, using DVOM, measure resistance between sensor connector terminal "D" (Brown wire at lumbar sensors) and MSM connector C1 terminal No. 13 (Gray wire at MSM). If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 18.
11. On recline sensor and rear vertical sensor using DVOM, measure resistance of Black wire between sensor connector terminal "A" and MSM connector C1 terminal No. 12. On lumbar in/out sensor and lumbar up/down sensor, using DVOM, measure resistance between sensor connector terminal "A" (Light Blue wire at sensor) and MSM connector C1 terminal No. 12 (Black wire at MSM). On front vertical sensor and forward/back sensor using DVOM, measure resistance of Black wire between sensor connector terminal "D" and MSM connector C1 terminal No. 12. If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 19.
12. Replace suspect sensor. See «SEAT POSITION SENSORS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to step 21.
13. On recline sensor, front vertical sensor, forward/back sensor and rear vertical sensor, repair open in Gray wire between sensor and splice S348 located in the seat harness approximately 1.5" from sensor harness breakout. On lumbar in/out and lumbar up/down sensor repair open in Brown wire between sensor and splice S331 located at the bottom of the rear seatback in lumbar harness. After repairs, go to step 21.
14. On recline sensor, front vertical sensor, forward/back sensor and rear vertical sensor, repair open in Black wire between sensor and splice S349 located in the seat harness approximately 4" from sensor harness breakout. On lumbar in/out and lumbar up/down sensor repair open in Light Blue wire between sensor and splice S321 located at the bottom of the rear seatback in lumbar harness. After repairs, go to step 21.
15. Repair short in suspect circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 21.
16. Repair open in suspect circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 21.
17. Repair short in Gray wire. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 21.
18. Repair open in Gray wire between MSM and splice S348 located in the seat harness approximately 1.5" from sensor harness breakout. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 21.
19. Repair open in Black wire between MSM and splice S349 located in the seat harness approximately 4" from sensor harness breakout. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 21.
20. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
21. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.

Memory Seat Module (MSM) receives inputs from lumbar up/down position sensor via lumbar massage module during memory set and memory recall. As motor moves seat, potentiometers in position sensor varies in resistance. MSM receives a variable voltage input depending on resistance of potentiometer. During memory set, MSM records voltage across all seat and lumbar potentiometers. During memory recall, MSM moves motors until voltage across each potentiometer matches stored voltages. During normal operation, position sensors are checked against out-of-range limits. DTC B2120 will not set if DTC B1982 or B1983 is current. MSM will set DTC B2120 when it detects the sensor input voltage is out of range (less than 0.25 volt or greater than 4.75 volts). When DTC B2120 is set, MSM will disable suspect motor during memory recall and easy exit functions. Motor will remain enabled for manual positioning. DTC B2120 will clear when MSM does not detect position sensor failure during last monitoring cycle.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. If any other seat position sensor DTCs are set, go to next step. See «MEMORY SEAT MODULE (MSM) DTCS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) table under SELF-DIAGNOSTIC SYSTEM. If no other seat position sensor DTCs are set, go to step 10.
3. Disconnect lumbar up/down position sensor connector. Using DVOM, measure resistance between terminal pins (sensor side) "A" and "D". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If reading is 5000-7000 ohms, go to next step. If reading is not 5000-7000 ohms, go to step 23.
4. Using DVOM, measure resistance between terminal pins (sensor side) "A" and "B". If reading is 500-6500 ohms, go to next step. If reading is not 500-6500 ohms, go to step 23.
5. Disconnect Memory Seat Module (MSM) connector C1. Using DVOM, measure resistance between sensor connector terminal "D" (Brown wire) and MSM connector C1 terminal No. 13 (Gray wire). (Scheme 4) If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 14.
6. Using DVOM, measure resistance between sensor connector terminal "A" (Light Blue wire at sensor) and MSM connector C1 terminal No. 12 (Black wire at MSM). If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 15.
7. Using DVOM, measure resistance between lumbar vertical position sensor connector terminal "B" (Dark Blue/White wire) and ground. If reading is less than 5 ohms, go to step 16. If reading is greater than 5 ohms, go to next step.
8. Using DVOM, measure resistance between lumbar vertical position sensor connector terminal "B" (Dark Blue/White wire) and lumbar massage module connector terminal "K" (Black wire). If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 17.
9. Using DVOM, measure resistance of Black wire between MSM connector C1 terminal No. 3 and lumbar massage module connector terminal "M". If reading is less than 5 ohms, go to step 22. If reading is greater than 5 ohms, go to step 18.
10. Disconnect lumbar up/down position sensor connector. Disconnect Memory Seat Module (MSM) connector C1. Using DVOM, measure resistance between MSM connector C1 terminal No. 13 (Gray wire) and ground. If reading is less than 5 ohms, go to step 19. If reading is greater than 5 ohms, go to next step.
11. Using DVOM, measure resistance between sensor connector terminal "D" (Brown wire) and MSM connector C1 terminal No. 13 (Gray wire). If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 20.
12. Using DVOM, measure resistance between sensor connector terminal "A" (Light Blue wire) and MSM connector C1 terminal No. 12 (Black wire). If reading is less than 5 ohms, go to step 22. If reading is greater than 5 ohms, go to step 21.
13. Replace lumbar up/down sensor. See «SEAT POSITION SENSORS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to step 23.
14. Repair open in Brown wire between sensor and splice S331 located at the bottom of the rear seatback in lumbar harness. After repairs, go to step 23.
15. Repair open in Light Blue wire between sensor and splice S321 located at the bottom of the rear seatback in lumbar harness. After repairs, go to step 23.
16. Repair short in Black or Dark Blue/White wire between sensor and lumbar massage module. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 23.
17. Repair open in Black or Dark Blue/White wire between sensor and lumbar massage module. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 23.
18. Repair open in Black wire between MSM and lumbar massage module. After repairs, go to step 23.
19. Repair short in Brown or Gray wire between MSM and splice S331. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 23.
20. Repair open in Brown or Gray wire between MSM and splice S331. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 23.
21. Repair open in Black or Dark Blue wire between MSM and splice S321. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 23.
22. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
23. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.

Memory Seat Module (MSM) supplies voltage to seat and lumbar motors when it receives input from manual switch or recall function. DTC B2130 will not set if DTC B1982 or B1983 is current. DTC B2130 will set when only one motor is being driven and motor's current draw is greater than 45 amps. When DTC B2130 is set, all seat movement is stopped. DTC B2130 will clear when MSM does not detect seat motor failure during last monitoring cycle.

1. If power seats system check was performed, go to next step. If power seats system check was not performed, go to SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.
2. Disconnect left forward/back motor connector. Connect a fused jumper wire between one forward/back motor terminal and battery voltage. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). Connect another fused jumper wire between other forward/back motor terminal and ground. If forward/back motor runs, go to next step. If forward/back motor does not run, go to step 33.
3. Disconnect Memory Seat Module (MSM) Natural, 6-pin connector C4. Using DVOM, measure resistance of Tan wire between MSM connector C4 terminal "C" and left forward/back motor connector terminal "A". (Scheme 5) If resistance is less than 2 ohms, go to step 5. If resistance is greater than 2 ohms, go to next step.
4. Repair open in Tan wire between left forward/back motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
5. Disconnect MSM Light Green, 6-pin connector C2. Measure resistance of Light Green wire between MSM connector C2 terminal "A" and left forward/back motor connector terminal "B". (Scheme 5) If resistance is less than 2 ohms, go to step 7. If resistance is greater than 2 ohms, go to next step.
6. Repair open in Light Green wire between left forward/back motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
7. Disconnect left rear vertical motor connector. Connect a fused jumper wire between one rear vertical motor terminal and battery voltage. Connect another fused jumper wire between other rear vertical motor terminal and ground. If rear vertical motor runs, go to next step. If rear vertical motor does not run, go to step 33.
8. Using DVOM, measure resistance of Yellow wire between MSM connector C4 terminal "E" and left rear vertical motor connector terminal "B". If resistance is less than 2 ohms, go to step 10. If resistance is greater than 2 ohms, go to next step.
9. Repair open in Yellow wire between left rear vertical motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
10. Measure resistance of Light Blue wire between MSM connector C2 terminal "B" and left rear vertical motor connector terminal "A". If resistance is less than 2 ohms, go to step 12. If resistance is greater than 2 ohms, go to next step.
11. Repair open in Light Blue wire between left rear vertical motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
12. Disconnect left front vertical motor connector. Connect a fused jumper wire between one front vertical motor terminal and battery voltage. Connect another fused jumper wire between other front vertical motor terminal and ground. If front vertical motor runs, go to next step. If front vertical motor does not run, go to step 33.
13. Using DVOM, measure resistance of Dark Green wire between MSM connector C4 terminal "A" and left front vertical motor connector terminal "B". If resistance is less than 2 ohms, go to step 15. If resistance is greater than 2 ohms, go to next step.
14. Repair open in Dark Green wire between left front vertical motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
15. Disconnect MSM Black 6-pin connector C3. Using DVOM, measure resistance of Dark Blue wire between MSM connector C3 terminal "F" and left front vertical motor connector terminal "A". (Scheme 5) If resistance is less than 2 ohms, go to step 17. If resistance is greater than 2 ohms, go to next step.
16. Repair open in Dark Blue wire between left front vertical motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
17. Disconnect left recline motor connector. Connect a fused jumper wire between one recline motor terminal and battery voltage. Connect another fused jumper wire between other recline motor terminal and ground. If recline motor runs, go to next step. If recline motor does not run, go to step 33.
18. Using DVOM, measure resistance of Light Green wire between MSM connector C4 terminal "D" and left recline motor connector terminal "B". If resistance is less than 2 ohms, go to step 20. If resistance is greater than 2 ohms, go to next step.
19. Repair open in Light Green wire between left recline motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
20. Measure resistance of Light Blue wire between MSM connector C2 terminal "F" and left recline motor connector terminal "A". If resistance is less than 2 ohms, go to step 22. If resistance is greater than 2 ohms, go to next step.
21. Repair open in Light Blue wire between left recline motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
22. Disconnect left in/out lumbar motor connector. Connect a fused jumper wire between one in/out lumbar motor terminal and battery voltage. Connect another fused jumper wire between other in/out lumbar motor terminal and ground. If in/out lumbar motor runs, go to next step. If in/out lumbar motor does not run, go to step 33.
23. Using DVOM, measure resistance between MSM connector C4 terminal "F" (Pink wire at MSM) and left in/out lumbar motor connector terminal "A" (Pink/Black wire at motor). If resistance is less than 2 ohms, go to step 25. If resistance is greater than 2 ohms, go to next step.
24. Repair open in Pink or Pink/Black wire between left in/out lumbar motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
25. Measure resistance between MSM connector C3 terminal "A" (Dark Blue wire at MSM) and left in/out lumbar motor connector terminal "B" (Dark Blue/White wire at motor). If resistance is less than 2 ohms, go to step 27. If resistance is greater than 2 ohms, go to next step.
26. Repair open in Dark Blue wire between left in/out lumbar motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
27. Disconnect left up/down lumbar motor connector. Connect a fused jumper wire between one up/down lumbar motor terminal and battery voltage. Connect another fused jumper wire between other up/down lumbar motor terminal and ground. If up/down lumbar motor runs, go to next step. If up/down lumbar motor does not run, go to step 33.
28. Using DVOM, measure resistance of Tan wire between MSM connector C3 terminal "A" and left up/down lumbar motor connector terminal "A". If resistance is less than 2 ohms, go to step 30. If resistance is greater than 2 ohms, go to next step.
29. Repair open in Tan wire between left up/down lumbar motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). Clear DTCs. Recheck system operation.
30. Measure resistance of Purple wire between MSM connector C3 terminal "E" and left up/down lumbar motor connector terminal "B". If resistance is less than 2 ohms, go to step 32. If resistance is greater than 2 ohms, go to next step.
31. Repair open in Purple wire between left up/down lumbar motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). After repairs, go to step 34.
32. Clear DTCs. Cycle ignition. Operate all left seat motors. If DTC B2130 resets, replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. Recheck system operation.
33. Replace suspect seat motor. See appropriate POWER SEATS article. After repairs, go to next step.
34. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING in POWER SEATS - DEVILLE & ELDORADO article.

Memory Mirror Module (MMM) performs self-tests on its EEPROM. DTC B1656 and B1658 will set if MMM detects a problem with the EEPROM. When DTC B1656 is set, module will store value being written on another block of EEPROM. When DTC B1658 is set, module will use default values for blocks of EEPROM that are corrupt. DTCs will clear when self-test indicates that EEPROM is okay.

Diagnostic Procedures

1. Turn ignition on. Clear any DTCs. Turn ignition off and back on again. Recheck for DTCs. If DTC B1656 or B1658 is still present, go to next step. If DTC is no longer present, go to «OUTSIDE MIRRORS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Replace MMM. See «MEMORY MIRROR MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
3. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to «OUTSIDE MIRRORS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.

Memory Mirror Module (MMM) is supplied battery voltage using circuit No. 1740 (Orange wire). MMM monitors battery voltage to ensure voltage is within valid operating range. DTC B1982 will set when battery voltage is greater than 15.5 volts. DTC B1983 will set when battery voltage is less than 9 volts. When DTC B1983 is set, MMM will try to "write" status of DTC to EEPROM, then no other "writes" to EEPROM will occur while DTC is current. DTC B1982 or B1983 will clear when conditions for setting the code no longer exist.

1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). Select DATA from MMM DATA LIST. If reading is 9.0-15.5 volts, go to step 3. If reading is not 9.0-15.5 volts, go to next step.
2. Disconnect MMM connector. Using DVOM, measure voltage between MMM harness connector terminal E1 (Orange wire) and ground. (Scheme 7) If reading is 9.0-15.5 volts, go to next step. If reading is not 9.0-15.5 volts, locate and repair problem in charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. Recheck system operation.
3. Clear DTCs. Cycle ignition. Check for DTCs. If DTC is current, replace MMM. See «MEMORY MIRROR MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
4. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to «OUTSIDE MIRRORS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.

These DTCs will not allow most other DTCs to set. DTC B1982 may set if vehicle is placed on a battery charger on fast charge for a long period of time.

Memory Mirror Module (MMM) receives inputs from memory function switch. When a switch is operated, it becomes grounded. MMM recognizes each input, performs the requested action and sends a class 2 message to MSM. MSM then also performs the requested action. When any memory function switch input continues to be active for 30 seconds after motion in requested direction has ceased, switch is considered shorted. Appropriate DTC will set when a switch failure is detected. When DTC is set, associated motor outputs of suspect switch will be deactivated. MMM will continue to respond to valid inputs from other manual switches. All memory recall commands will be ignored. DTC will clear when MMM does not detect switch failure during last monitoring cycle.

1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). Disconnect memory function switch. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to step 3.
2. Repair short to ground in White, Purple, Orange or Black wire between corresponding DTC description memory function switch and MMM terminal. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). (Scheme 7) Go to step 4.
3. Replace memory function switch. See «MEMORY FUNCTION SWITCH»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
4. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to «OUTSIDE MIRRORS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.

Memory Mirror Module (MMM) receives inputs from outside mirror switch. Mirror select switch must be placed in either right or left position in order to operate outside mirror switch. When mirror switch is operated, more than one input is sent from outside mirror switch to MMM. When MMM recognizes input combination, appropriate mirror will be moved in requested direction. If MMM does not recognize input combination as valid, input will be ignored and mirror will not be moved. When any mirror switch input continues to be active for 30 seconds after motion in requested direction has ceased, switch is considered shorted. Appropriate DTC will set when a switch failure is detected. When DTC is set, associated motor outputs of suspect switch will be deactivated. MMM will continue to respond to valid inputs from other manual switches. All memory recall commands will be ignored. DTC will clear when MMM does not detect switch failure during last monitoring cycle.

1. Connect scan tool and turn ignition on. Disconnect memory function switch connector. Using scan tool, clear DTCs. After 30 seconds, check for DTCs. If DTC is reset, go to next step. If DTC is not reset, go to «OUTSIDE MIRRORS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Replace outside mirror switch. Go to next step.
3. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to «OUTSIDE MIRRORS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.

DTC B2144: DRIVER MIRROR VERTICAL SENSOR SHORT TO GROUND, B2146: DRIVER MIRROR HORIZONTAL SENSOR SHORT TO GROUND, B2148: PASSENGER MIRROR VERTICAL SENSOR SHORT TO GROUND OR B2150: PASSENGER MIRROR HORIZONTAL SENSOR SHORT TO GROUND

Note. If multiple mirror position sensor DTCs are set, check for open or short in circuit No. 674 (Yellow wire) between outside mirror and Memory Mirror Module (MMM). Check for open in circuit No. 675 (Light Green wire) between outside mirror and MMM. Repair as necessary. See WIRING DIAGRAMS .

Each mirror position sensor is a potentiometer. As mirror is moved, resistance varies in each position sensor. During all memory functions, Memory Mirror Module (MMM) receives input from each mirror position sensor. During memory set function, MMM stores current voltages across position sensors. During memory recall and memory exit functions, MMM moves mirrors until each position sensor voltage matches stored voltage values. These DTCs will not set if DTC B1982 or B1983 is current. Appropriate DTC will set when MMM detects any sensor input voltage is out of range. If input is less than 0.25 volt, MMM will set appropriate DTC. When DTC is set, MMM will disable suspect motor during memory recall and easy exit functions. Motor can be enabled during manual positioning. DTC will clear when MMM does not detect switch failure during last monitoring cycle.

1. Turn ignition off. Disconnect Memory Mirror Module (MMM) connector C1. Using DVOM, measure resistance between MMM connector C1 terminal F9 (Light Green wire, sensor return circuit) and following MMM connector C1 terminal corresponding with suspect mirror circuit: Terminal E4 (Dark Green wire) for left mirror up/down position sensor input circuit. Terminal E5 (Gray wire) for left mirror left/right position sensor input circuit. Terminal F4 (Brown wire) for right mirror up/down position sensor input circuit. Terminal F5 (Light Blue/Black wire) for right mirror left/right position sensor input circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). (Scheme 7) If reading is 5 ohms or less, go to step 3. If reading is greater than 5 ohms, go to next step.
2. Replace MMM. See «MEMORY MIRROR MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to step 6.
3. Disconnect corresponding left or right outside mirror connector C2. Using DVOM, check continuity between ground and following mirror connector C2 terminal: Terminal "D" (Dark Green wire) for left mirror up/down position sensor input circuit. Terminal "C" (Gray wire) for left mirror left/right position sensor input circuit. Terminal "D" (Brown wire) for right mirror up/down position sensor input circuit. Terminal "C" (Light Blue/Black wire) for right mirror left/right position sensor input circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If continuity is indicated, go to step 5. If continuity is not indicated, go to next step.
4. Replace suspect mirror assembly. After repairs, go to step 6.
5. Repair short to ground in suspect circuit between outside mirror and MMM. After repairs, go to next step.
6. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to «OUTSIDE MIRRORS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.

DTC B2145: DRIVER MIRROR VERTICAL SENSOR SHORT TO BATTERY, B2147: DRIVER MIRROR HORIZONTAL SENSOR SHORT TO BATTERY, B2149: PASSENGER MIRROR VERTICAL SENSOR SHORT TO BATTERY OR B2151: PASSENGER MIRROR HORIZONTAL SENSOR SHORT TO BATTERY

Note. If multiple mirror position sensor DTCs are set, check for open or short in circuit No. 674 (Yellow wire) between outside mirror and Memory Mirror Module (MMM). Check for open in circuit No. 675 (Light Green wire) between outside mirror and MMM. Repair as necessary. See WIRING DIAGRAMS .

Each mirror position sensor is a potentiometer. As mirror is moved, resistance varies in each position sensor. During all memory functions, Memory Mirror Module (MMM) receives input from each mirror position sensor. During memory set function, MMM stores current voltages across position sensors. During memory recall and memory exit functions, MMM moves mirrors until each position sensor voltage matches stored voltage values. These DTCs will not set if DTC B1982 or B1983 is current. Appropriate DTC will set when MMM detects any sensor input voltage is out of range. If input is 4.75 volts or more, MMM will set appropriate DTC. When DTC is set, MMM will disable suspect motor during memory recall and easy exit functions. Motor can be enabled during manual positioning. DTC will clear when MMM does not detect switch failure during last monitoring cycle.

1. Turn ignition off. Disconnect Memory Mirror Module (MMM) connector C1. Using DVOM, measure resistance between MMM connector C1 terminal E9 (Yellow wire, sensor 5-volt signal circuit) and following MMM connector C1 terminal corresponding with suspect mirror circuit: Terminal E4 (Dark Green wire) for left mirror up/down position sensor input circuit. Terminal E5 (Gray wire) for left mirror left/right position sensor input circuit. Terminal F4 (Brown wire) for right mirror up/down position sensor input circuit. Terminal F5 (Light Blue/Black wire) for right mirror left/right position sensor input circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . If reading is 5 ohms or less, go to step 3 . If reading is greater than 5 ohms, go to next step.
2. Replace MMM. See «MEMORY MIRROR MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to step 6 .
3. Disconnect corresponding left or right outside mirror connector C2. Using DVOM, check for open or short to voltage in following mirror circuits: Dark Green wire (terminal "D") for left mirror up/down position sensor input circuit. Gray wire (terminal "C") for left mirror left/right position sensor input circuit. Brown wire (terminal "D") for right mirror up/down position sensor input circuit. Light Blue/Black wire (terminal "C") for right mirror left/right position sensor input circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . If faulty circuit is found, go to step 5 . If circuit is okay, go to next step.
4. Replace suspect mirror assembly. After repairs, go to step 6 .
5. Repair open or short to voltage in suspect circuit between outside mirror and MMM. After repairs, go to next step.
6. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear DTCs. If DTC is no longer present, go to «OUTSIDE MIRRORS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.

SYSTEM TESTS

Note. For additional power seat related diagnosis and testing procedures, see POWER SEATS - DEVILLE & ELDORADO article.

DeVille

Note. This procedure applies to vehicles equipped with memory systems only.

1. If memory seats system check was performed, go to next step. If memory seats system check was not performed, go to «MEMORY SEATS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__memory-seats-system-check) under TROUBLE SHOOTING.
2. Disconnect Memory Seat Module (MSM) connector C2. Using DVOM, measure voltage between MSM connector C2 terminals "C" (Black wire) and "D" (Orange wire). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). (Scheme 5) If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 5.
3. Disconnect left front seat switch connector. Using DVOM, measure voltage between left seat switch connector terminal "J" (Black wire) and battery voltage. If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 6.
4. Replace left seat switch. See POWER SEATS - DEVILLE & ELDORADO article. After repairs, go to step 7.
5. Repair open in Black wire between MSM and splice S351 located in left seat harness approximately 2" from power seat motor harness breakout. After repairs, go to step 7.
6. Repair open in Black wire between left seat switch and splice S200 located behind left kick panel. After repairs, go to next step.
7. Recheck operation of power seats. If non-memory power seat component or system is thought to be at fault, go to POWER SEATS - DEVILLE & ELDORADO article.

Eldorado

Note. This procedure applies to vehicles equipped with memory systems.

1. If memory seats system check was performed, go to next step. If memory seats system check was not performed, go to «MEMORY SEATS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__memory-seats-system-check) under TROUBLE SHOOTING.
2. Disconnect Memory Seat Module (MSM) connector C2. Using DVOM, measure voltage between MSM connector C2 terminals "C" (Black wire) and "D" (Orange wire). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 6 .
3. Disconnect left seat switch connector. Using DVOM, measure voltage between MSM connector C2 terminals "D" (Orange wire) and "H" (Black wire). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 7 .
4. Check for short to ground in the following circuits between MSM and left power seat switch: Light Green wire between MSM connector C1 terminal No. 19 and left seat switch connector terminal "C". Tan wire between MSM connector C1 terminal No. 5 and left seat switch connector terminal "D". Yellow wire between MSM connector C1 terminal No. 6 and left seat switch connector terminal "F". Dark Green wire between MSM connector C1 terminal No. 4 and left seat switch connector terminal "B". Dark Blue wire between MSM connector C1 terminal No. 18 and left seat switch connector terminal "A". Light Blue wire between MSM connector C1 terminal No. 20 and left seat switch connector terminal "E". Gray/Black wire between MSM connector C1 terminal No. 7 and left seat switch connector terminal "M". Dark Green/White wire between MSM connector C1 terminal No. 21 and left seat switch connector terminal "K". If all circuits are okay, go to next step. If faulty circuit is found, go to step 8 .
5. Replace left seat switch. See POWER SEATS - DEVILLE & ELDORADO article. After repairs, go to step 9 .
6. Repair open in Black wire between MSM and splice S351 located in left seat harness approximately 2" from power seat motor harness breakout. After repairs, go to step 9 .
7. Repair open in Black wire between left power seat switch and splice S351 located in left seat harness approximately 2" from power seat motor harness breakout. After repairs, go to step 9 .
8. Repair short to ground in faulty circuit. After repairs, go to next step.
9. Recheck operation of power seats. If non-memory power seat component or system is thought to be at fault, go to POWER SEATS - DEVILLE & ELDORADO article.

POWER SEAT INOPERATIVE IN ONE DIRECTION

Note. This procedure applies to vehicles equipped with memory systems only.

1. If memory seats system check was performed, go to next step. If memory seats system check was not performed, go to «MEMORY SEATS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__memory-seats-system-check) under TROUBLE SHOOTING.
2. Turn ignition off. Enter Mode 1 testing by grounding the Memory Seat Module (MSM) connector C1 diagnostic terminal No. 11 (Yellow wire) located below left seat. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). MSM will beep once indicating Mode 1 diagnostics was entered successfully. All power seat motors are disabled during Mode 1 diagnostics. If one beep was heard from MSM, go to next step. If no beep was heard from MSM, go to step 7.
3. Operate left power seat switch to inoperative position. If MSM beeps when seat switch is pressed to inoperative position, go to step 8. If MSM does not beep when seat switch is pressed to inoperative position, go to next step.
4. Disconnect left seat switch connector. Using DVOM, measure resistance between seat switch terminal pin "J" and corresponding terminal for inoperative position. See «LEFT SEAT SWITCH CONNECTOR TERMINAL IDENTIFICATION (DEVILLE)»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) or «LEFT SEAT SWITCH CONNECTOR TERMINAL IDENTIFICATION (ELDORADO)»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) table. Operate seat in inoperative position. If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step 6.
5. Repair open in circuit corresponding with inoperative position. After repairs, go to step 11.
6. Replace left seat switch. See POWER SEATS - DEVILLE & ELDORADO article. After repairs, go to step 11.
7. Check for poor ground to MSM. If ground is okay, replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to step 11.
8. Disconnect suspect power seat motor connector. (Scheme 1) Connect a fused jumper between battery voltage and either terminal of suspect seat motor. Connect a jumper between ground and other terminal of suspect seat motor. If motor operates, go to next step. If motor does not operate, go to step 10.
9. Repair open or short to ground in appropriate circuit corresponding with inoperative seat switch position. After repairs, go to step 11.
10. Replace suspect inoperative power seat motor. See POWER SEATS - DEVILLE & ELDORADO article. After repairs, go to next step.
11. Recheck operation of power seats. If non-memory power seat component or system is thought to be at fault, go to POWER SEATS - DEVILLE & ELDORADO article.

LEFT SEAT SWITCH CONNECTOR TERMINAL IDENTIFICATION (DEVILLE) (1)

LEFT SEAT SWITCH CONNECTOR TERMINAL IDENTIFICATION (ELDORADO) (1)

LEFT LUMBAR SUPPORT INOPERATIVE

Note. This procedure applies to vehicles equipped with memory systems only.

1. If lumbar support memory system check was performed, go to next step. If lumbar support memory system check was not performed, go to «LUMBAR SUPPORT MEMORY SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under TROUBLE SHOOTING.
2. Disconnect Memory Seat Module (MSM) Light Green, 6-pin connector C2. (Scheme 5) Using DVOM, measure voltage between MSM harness connector C2, terminals "D" (Orange wire) and "C" (Black wire). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 5.
3. Disconnect left lumbar switch connector. Measure voltage between MSM harness connector C2, terminal "D" (Orange wire) and left lumbar switch harness connector terminal "E" (Black wire). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 6.
4. Replace left lumbar switch. See POWER SEATS - DEVILLE & ELDORADO article.
5. Repair open in Black wire between MSM and splice S351 located in left seat harness approximately 2" from power seat motor harness breakout. After repairs, go to «LUMBAR SUPPORT MEMORY SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under TROUBLE SHOOTING.
6. Repair open in Black wire between left lumbar switch and splice S351 located in left seat harness approximately 2" from power seat motor harness breakout. After repairs, go to «LUMBAR SUPPORT MEMORY SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under TROUBLE SHOOTING.

Scheme 5

LEFT LUMBAR SUPPORT DOES NOT MOVE UP OR DOWN

Note. This procedure applies to vehicles equipped with memory systems only.

1. If lumbar support memory system check was performed, go to next step. If lumbar support memory system check was not performed, go to «LUMBAR SUPPORT MEMORY SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under TROUBLE SHOOTING.
2. Turn ignition off. Enter Mode 1 Diagnostics by grounding Memory Seat Module (MSM) diagnostic connector, located under left seat (connector must remain grounded throughout test). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . MSM should beep once to confirm that Mode 1 Diagnostics has been entered. While in Mode 1 Diagnostics, all seat and recliner movements are disabled. If one beep was heard, go to next step. If one beep was not heard, go to step 7 .
3. Move left lumbar switch to inoperative position. If MSM beeps once when switch is moved to inoperative position, go to step 11 . If MSM does not beep once when switch is moved to inoperative position, go to next step.
4. Disconnect left lumbar switch connector. Move left lumbar switch to inoperative position. Using DVOM, measure resistance between Black wire terminal and appropriate left lumbar switch terminal (switch-side). See «LEFT LUMBAR SWITCH CONNECTOR TERMINAL IDENTIFICATION»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) table. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, go to step 6 .
5. Repair open in appropriate wire. After repairs, go to step 19 .
6. Replace left lumbar switch. See POWER SEATS - DEVILLE & ELDORADO article. After repairs, go to step 19 .
7. Check for poor connections at MSM. If poor connections are found, go to step 14 . If connections are okay, go to next step.
8. Check for open or short to ground in Orange wire between MSM connector C2 terminal "D" and splice S306 located in rear body harness approximately 2" from rear seat channel harness breakout. If faulty circuit is found, go to step 15 . If circuit is okay, go to next step.
9. Check for open in Black wire between MSM connector C2 terminal "C" and splice S351 located in left seat harness approximately 2" from power seat motor harness breakout. If faulty circuit is found, go to step 16 . If circuit is okay, go to next step.
10. Check for open in Red wire between MSM connector C2 terminal "B" and splice S311 located under left seat approximately 14" from ground harness breakout. If faulty circuit is found, go to step 17 . If circuit is okay, go to step 18 .
11. Disconnect suspect seat lumbar motor. Connect a fused jumper (20-amp) wire between one motor terminal and battery voltage. Connect another fused jumper (20-amp) wire between other motor terminal and ground. If motor runs, go to next step. If motor does not run, go to step 13 .
12. Repair open or short to ground in appropriate wire between suspect motor and MSM. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . After repairs, go to step 19 .
13. Replace suspect seat lumbar motor. See POWER SEATS - DEVILLE & ELDORADO article. After repairs, go to step 19 .
14. Repair faulty terminals. After repairs, go to step 19 .
15. Repair open in Orange wire between MSM and splice S306. After repairs, go to step 19 .
16. Repair open in Black wire between MSM and splice S351. After repairs, go to step 19 .
17. Repair open in Red wire between MSM connector C2 terminal "B" and splice S311. After repairs, go to step 19 .
18. Replace MSM. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to next step.
19. Perform «LUMBAR SUPPORT MEMORY SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under TROUBLE SHOOTING.

LEFT LUMBAR SWITCH CONNECTOR TERMINAL IDENTIFICATION

BOTH POWER MIRRORS INOPERATIVE

Note. This procedure applies to vehicles equipped with memory systems only.

1. If outside mirrors system check was performed, go to next step. If outside mirrors system check was not performed, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Check for open or short to ground in Orange wire between outside mirror switch, Memory Mirror Module (MMM) and MIRROR fuse (10-amp) located in under hood fuse block. If circuit is okay, go to step 4. If faulty circuit is found, go to next step.
3. Repair open in Orange wire between outside mirror switch, MMM, MIRROR fuse and splice S505. (Scheme 6) After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
4. Check for open in Black wire between MMM and ground G205 located behind kick panel on passenger's side. If circuit is okay, go to step 6. If faulty circuit is found, go to next step.
5. Repair open in Black wire between MMM and ground. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
6. Check for open in Black wire between outside mirror switch and ground G204 located behind kick panel on driver's side. If circuit is okay, go to step 8. If faulty circuit is found, go to next step.
7. Repair open in Black wire between outside mirror switch and ground. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
8. Check for poor connections at outside power mirror switch. If poor connections are found and repaired, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING. If connections are okay, check for faulty switch. If switch is faulty, go to next step. If switch is okay, go to step 10.
9. Replace outside mirror switch. See POWER MIRRORS - DEVILLE & ELDORADO article.
10. Replace MMM. See «MEMORY MIRROR MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION.

Scheme 6

MIRROR MEMORY FUNCTION SWITCH INOPERATIVE

1. If outside mirrors system check was performed, go to next step. If outside mirrors system check was not performed, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Test memory function switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If switch tests okay, go to next step. If switch does not test okay, go to step 6.
3. Check for open in Black wire between memory function switch connector terminal "D" and Memory Mirror Module (MMM) connector C1 terminal F3. (Scheme 7) If faulty circuit is found, go to next step. If circuit is okay, go to step 5.
4. Repair open in Black wire between memory function switch and Memory Mirror Module (MMM). After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
5. Replace memory function switch. See «MEMORY FUNCTION SWITCH»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION.
6. If memory function switch MEMORY1 button is inoperative, go to next step. If MEMORY 1 button works, go to step 10.
7. Test MEMORY 1 switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If switch tests okay, go to next step. If switch does not test okay, go to step 5.
8. Check for open or short to ground in White wire between memory function switch connector terminal "A" and MMM connector C1 terminal E2. If faulty circuit is found, go to next step. If circuit is okay, go to step 21.
9. Repair open or short to ground in White wire between memory function switch and MMM. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
10. If memory function switch MEMORY 2 button is inoperative, go to next step. If MEMORY 2 button works, go to step 14.
11. Test MEMORY 2 switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If switch tests okay, go to next step. If switch does not test okay, go to step 5.
12. Check for open or short to ground in Purple wire between memory function switch connector terminal "C" and MMM connector C1 terminal F2. If faulty circuit is found, go to next step. If circuit is okay, go to step 21.
13. Repair open or short to ground in Purple wire between memory function switch and MMM. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
14. If memory function switch SET button is inoperative, go to next step. If SET button works, go to step 18.
15. Test SET switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If switch tests okay, go to next step. If switch does not test okay, go to step 5.
16. Check for open or short to ground in Orange wire between memory function switch connector terminal "B" and MMM connector C1 terminal E3. If faulty circuit is found, go to next step. If circuit is okay, go to step 21.
17. Repair open or short to ground in Orange wire between memory function switch and MMM. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
18. Test EXIT switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). If switch tests okay, go to next step. If switch does not test okay, go to step 5.
19. Check for open or short to ground in Black wire between memory function switch connector terminal "D" and MMM connector C1 terminal F3. If faulty circuit is found, go to next step. If circuit is okay, go to step 21.
20. Repair open or short to ground in Black wire between memory function switch and MMM. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
21. Replace MMM. See «MEMORY MIRROR MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION.

1. If outside mirrors system check was performed, go to next step. If outside mirrors system check was not performed, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Using DVOM, measure voltage by backprobing between outside rear view mirror switch connector terminal "E" (Orange wire) and ground. If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 7.
3. Using DVOM, measure voltage by backprobing between outside rear view mirror switch connector terminals "E" (Orange wire) and "D" (Black wire). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 8.
4. If both mirrors operate in all directions during memory recall operation, go to next step. If both mirrors do not operate in all directions during memory recall operation, go to step 6.
5. Replace outside mirror switch. See POWER MIRRORS - DEVILLE & ELDORADO article. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
6. Replace Memory Mirror Module (MMM). See «MEMORY MIRROR MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
7. Repair open in Orange wire between outside mirror switch, Memory Mirror Module (MMM), MIRROR fuse and splice S505. (Scheme 6) After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
8. Repair open in Black wire between outside mirror switch and splice S200 located behind left kick panel. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.

1. If outside mirrors system check was performed, go to next step. If outside mirrors system check was not performed, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Using DVOM, measure voltage by backprobing between outside rear view mirror switch connector terminal "H" (Orange wire) and ground. If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 9.
3. Using DVOM, measure voltage by backprobing between outside rear view mirror switch connector terminals "H" (Orange wire) and "A" (Black wire). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 10.
4. Using DVOM, measure voltage by backprobing between outside rear view mirror switch connector terminals "H" (Orange wire) and "C" (Tan/White wire). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 11.
5. Using DVOM, measure voltage by backprobing between outside rear view mirror switch connector terminals "H" (Orange wire) and "B" (Brown wire). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 11.
6. Using DVOM, measure voltage by backprobing between outside rear view mirror switch connector terminal "H" (Orange wire) and Memory Mirror Module (MMM) connector C1 terminal F8 (Tan/White wire). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 12.
7. Using DVOM, measure voltage by backprobing between outside rear view mirror switch connector terminal "H" (Orange wire) and MMM connector C1 terminal E8 (Brown wire). If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step 13.
8. Replace MMM. See «MEMORY MIRROR MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
9. Repair open in Orange wire between outside mirror switch, Memory Mirror Module (MMM), MIRROR fuse and splice S505. (Scheme 6) After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
10. Repair open in Black wire between outside mirror switch and splice S200 located behind left kick panel. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
11. Replace outside mirror switch. See POWER MIRRORS - DEVILLE & ELDORADO article. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
12. Repair open in Tan/White wire between outside rear view mirror and MMM. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
13. Repair open in Brown wire between outside rear view mirror and MMM. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.

LEFT MIRROR DOES NOT MOVE UP & DOWN

Note. This procedure applies to vehicles equipped with memory systems only.

1. If outside mirrors system check was performed, go to next step. If outside mirrors system check was not performed, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Check for open in Light Green wire between left outside mirror connector C1 terminal "C" and Memory Mirror Module (MMM) connector C1 terminal F12. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). (Scheme 7) If faulty circuit is found, go to next step. If circuit is okay, go to step 4.
3. Repair open in Light Green wire between Memory Mirror Module (MMM) and left outside mirror. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
4. Check for open in Yellow wire between left outside mirror connector C1 terminal "D" and MMM connector C1 terminal F10. If faulty circuit is found, go to next step. If circuit is okay, go to step 6.
5. Repair open in Yellow wire between MMM and outside mirror switch. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
6. Left outside mirror or MMM are at fault. Replace MMM and/or left outside mirror. For MMM, see «MEMORY MIRROR MODULE (MMM)»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. For left outside mirror, see POWER MIRRORS - DEVILLE & ELDORADO article.

Scheme 7

LEFT MIRROR DOES NOT MOVE LEFT & RIGHT

Note. This procedure applies to vehicles equipped with memory systems only.

1. If outside mirrors system check was performed, go to next step. If outside mirrors system check was not performed, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Check for open in Light Blue wire between left outside mirror connector C1 terminal "A" and Memory Mirror Module (MMM) connector C1 terminal E13. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). (Scheme 7) If faulty circuit is found, go to next step. If circuit is okay, go to step 4.
3. Repair open in Light Blue wire between Memory Mirror Module (MMM) and left outside mirror. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
4. Check for open in White wire between left outside mirror connector C1 terminal "B" and MMM connector C1 terminal E11. If faulty circuit is found, go to next step. If circuit is okay, go to step 6.
5. Repair open in White wire between MMM and outside mirror switch. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
6. Left outside mirror or MMM are at fault. Replace MMM and/or left outside mirror. For MMM, see «MEMORY MIRROR MODULE (MMM)»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. For left outside mirror, see POWER MIRRORS - DEVILLE & ELDORADO article.

RIGHT MIRROR DOES NOT MOVE UP & DOWN

Note. This procedure applies to vehicles equipped with memory systems only.

1. If outside mirrors system check was performed, go to next step. If outside mirrors system check was not performed, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Check for open in Purple/White wire between right outside mirror connector C1 terminal "C" and Memory Mirror Module (MMM) connector C1 terminal E12. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). (Scheme 7) If faulty circuit is found, go to next step. If circuit is okay, go to step 4.
3. Repair open in Purple/White wire between Memory Mirror Module (MMM) and right outside mirror. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
4. Check for open in Brown/White wire between right outside mirror connector C1 terminal "D" and MMM connector C1 terminal E10. If faulty circuit is found, go to next step. If circuit is okay, go to step 6.
5. Repair open in Brown/White wire between MMM and outside mirror switch. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
6. Right outside mirror or MMM are at fault. Replace MMM and/or right outside mirror. For MMM, see «MEMORY MIRROR MODULE (MMM)»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. For left outside mirror, see POWER MIRRORS - DEVILLE & ELDORADO article.

RIGHT MIRROR DOES NOT MOVE LEFT & RIGHT

Note. This procedure applies to vehicles equipped with memory systems only.

1. If outside mirrors system check was performed, go to next step. If outside mirrors system check was not performed, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
2. Check for open in Gray wire between right outside mirror connector C1 terminal "A" and Memory Mirror Module (MMM) connector C1 terminal F13. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system). (Scheme 7) If faulty circuit is found, go to next step. If circuit is okay, go to step 4.
3. Repair open in Gray wire between Memory Mirror Module (MMM) and right outside mirror. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
4. Check for open in Red/White wire between right outside mirror connector C1 terminal "B" and MMM connector C1 terminal F11. If faulty circuit is found, go to next step. If circuit is okay, go to step 6.
5. Repair open in Red/White wire between MMM and outside mirror switch. After repairs, go to «OUTSIDE MIRROR SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system__outside-mirror-system-check) under TROUBLE SHOOTING.
6. Right outside mirror or MMM are at fault. Replace MMM and/or right outside mirror. For MMM, see «MEMORY MIRROR MODULE (MMM)»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) under REMOVAL & INSTALLATION. For left outside mirror, see POWER MIRRORS - DEVILLE & ELDORADO article.

REMOVAL & INSTALLATION

Note. For additional removal and installation procedures, see appropriate POWER SEATS or POWER MIRRORS article.

Remove hush panel located under left side of instrument panel, surrounding pedal assembly. Disconnect electrical connectors from MMM. Remove retainers attaching MMM to bracket. (Scheme 2) Remove MMM. To install, reverse removal procedure.

1. On Eldorado, remove lower fastener from shoulder belt guide loop. Carefully guide shoulder belt out through guide loop. On all models, move seat to full rearward position. Remove front sight shield(s) from seat track. Move seat to full forward position. Remove rear sight shields from seat track. Move seat to full up position. Remove seat anchor bolts at rear of seat. Disconnect rear air conditioning/heating duct, if equipped. Tilt seat forward, and disconnect electrical connectors.
2. On vehicles equipped with split front seat, remove rear seat cushion, as front seat will be removed through left rear door. On all models, pull seat rearward to disengage seat from front retaining hooks.
3. Place seat upside down on a flat surface. Unhook memory seat module from retainers. (Scheme 1) Disconnect electrical connectors and remove MSM from seat bottom.
4. To install, reverse removal procedure. Tighten seat anchor bolts to 22 ft. lbs. (30 N.m). Check operation of seat, and adjust if necessary.

Memory function switch is part of master power window switch located in left front door panel arm rest, and must be replace as one unit. Using tape, cover front of switch and rear of door upholstery to prevent damage. Using a thin-blade screwdriver, pry between switch and door panel for spring clip. On DeVille, clip is at front of switch. On Eldorado, clip is at rear of switch. On all models, press down on clip to release switch and pry outward. Disconnect electrical connector and remove switch. To install, reverse removal procedure.

Removal & Installation (Forward/Back & Up/Down Sensors)

Move seat to full up position. Remove power seat. See MEMORY SEAT MODULE . Place seat upside-down on a clean surface. Remove sensor retainer clip. Disconnect electrical connectors to sensors. Remove motor fasteners so cable can be removed without damage. Disconnect horizontal and vertical drive cables by squeezing oblong connector at motors, gearnuts or adjuster drives. Remove cable/sensor assembly. To install, reverse removal procedure.

Removal & Installation (Recline Sensor)

1. Move seat to full up position. Remove power seat. See «MEMORY SEAT MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/memory-modules/#memory-system) . Place seat upside-down on a clean surface. Disconnect heated seatback electrical connectors, as necessary. Remove 2 screws from bottom corners of trim cover. Lift up and outward to release hooks, and remove trim cover.
2. Remove retainer clip from recliner motor end of recliner shaft. Slide recliner shaft out of recliner motor sensor (outboard side) far enough to clear recliner sensor. Disconnect recliner sensor electrical sensor. Release recliner sensor from recliner gear drive case. Remove fastener for recliner actuator motor. Remove recliner sensor from recliner shaft. To install, reverse removal procedure.

Memory Power Seats/Power Mirrors Wiring Diagram (DeVille - 1 Of 2). Scheme 8

Memory Power Seats/Power Mirrors Wiring Diagram (DeVille - 2 Of 2). Scheme 9

Memory Power Seats/Power Mirrors Wiring Diagram (Eldorado - 1 Of 2). Scheme 10

Memory Power Seats/Power Mirrors Wiring Diagram (Eldorado - 2 Of 2). Scheme 11

See also:
• WIRING DIAGRAMS
• POWER SEAT INOPERATIVE IN ONE DIRECTION
• OUTSIDE MIRROR SYSTEM CHECK
• SYSTEM TESTS
• LUMBAR SUPPORT DOES NOT MOVE UP OR DOWN
• LEFT LUMBAR SUPPORT INOPERATIVE
• MEMORY SEATS SYSTEM CHECK
• B2101
• B2109
• B2111
• B2112
• MEMORY SEAT MODULE (MSM) DIAGNOSTIC TESTS
• B2144
• B2145