Power Seat System Cadillac Eldorado X

DESCRIPTION

Note. For information on memory seat systems, see MEMORY SYSTEMS article.

Power seats operate using toggle switches located on seat side or in door arm rest. Seat adjusters are powered by a 12-volt, reversible motor with an internal circuit breaker. A 30-amp, plug-in circuit breaker, located in fuse panel, protects power seat wiring. On some models, seats are available with heating and memory options.

6-WAY POWER SEATS

Power seats use 3 reversible motors that operate seat functions. Front and back parts of seat are operated by different motors, and can be raised and lowered independently. Third motor controls forward/backward movement. Drive cables connect motor to gearnuts, which turn jackscrews and adjusters at each side of seat.

LUMBAR SEATS

Lumbar seat is an option on some models. Power is supplied by a 30-amp circuit breaker in fuse block. Adjustments are made by up/down or fore/aft lumbar relays located in seatback. Operation is controlled by a switch located on seat side or in center console.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

HORIZONTAL ACTUATOR

1. Chucking can be corrected by adjusting horizontal actuator and pinion gear to fully mesh with lower adjuster track rack gear. Operate seat to full up position and about 3/4 forward. Loosen horizontal actuator attaching screws. (Scheme 1)
2. Using a large screwdriver, apply outward pressure on horizontal actuator (about 15-25 ft. lbs.) and energize horizontal switch to move seat slightly fore and aft. This keeps seat horizontal actuator pinion gear teeth in close contact with lower track rack gear teeth and eliminates free play between gear teeth. Tighten screws while maintaining outward pressure against horizontal actuators.

Scheme 1

SEAT ADJUSTER PHASING

When installing power seat adjusters (except at back recliner), ensure each pair of adjusters is in phase. When adjusters are out of phase, one adjuster will reach its maximum travel limit before the other, resulting in improper seat travel.

Horizontal Travel

Operate seat until one adjuster reaches full forward position. Detach horizontal drive cable from adjuster which has reached its travel limit. Operate seat forward until other adjuster reaches its full forward position. Reconnect drive cable of first adjuster. Adjusters are now in phase.

Vertical Travel (Front Or Rear)

1. Operate seat until one adjuster has reached fully raised position at both front and rear vertical travel limits. Disconnect both front and rear vertical drive cables from adjuster which has reached its travel limit.
2. Operate seat until other adjuster reaches fully raised position. Reconnect previously disconnected front and rear vertical drive cables. Seat adjusters should be in phase. If not, repeat procedure.

PRELIMINARY CHECKS

1. If power accessory circuit breaker opens whenever power seat switch is operated, check circuits for a short to ground. Ensure ground connections are clean and tight. Check for proper installation of aftermarket electronic equipment.
2. 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. Check by monitoring for voltage drop with system under load.

Jerky Horizontal Operation

Check for improper lubrication of adjuster shoes and channels. Check for horizontal actuator-to-rack gear adjusted too tight. See HORIZONTAL ACTUATOR under ADJUSTMENTS.

Horizontal Chuck Or Looseness

Check for horizontal actuator improperly adjusted. See HORIZONTAL ACTUATOR under ADJUSTMENTS.

One Adjuster Will Not Operate Horizontally

Check for disconnected or damaged horizontal drive cable. Check for inoperative horizontal actuator.

One Adjuster Will Not Operate Vertically

Check for disconnected or damaged vertical drive cable. Check vertical gearnut inoperation. Replace vertical actuator assembly if necessary.

DIAGNOSIS & TESTING

Note. To locate components, see COMPONENT LOCATIONS .

All Power Seat Functions Inoperative

1. Disconnect seat relay module Black 6-pin connector C3. Using DVOM, check voltage between seat relay module harness connector C3 terminal "A" (Red wire) and ground. If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 7).
2. Disconnect seat relay module Light Green 6-pin connector C2. Check voltage between seat relay module harness connector C3 terminal "A" (Red wire) and harness connector C2 terminal "C" (Black wire). If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 8).
3. Disconnect seat switch connector. Check voltage between seat relay module harness connector C3 terminal "A" (Red wire) and Black wire terminal of seat switch harness connector (terminal "J" for left seat or terminal "B" for right seat). If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 9).
4. Reconnect seat relay module connectors C2 and C3. For left seat, connect a fused jumper wire between seat switch harness connector terminal "F" (Gray wire) and ground. For right seat, connect a fused jumper wire between seat switch harness connector terminal "E" (Tan wire) and ground. If seat moves forward, go to next step. If seat does not move forward, go to step 7).
5. Replace seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
6. Replace seat relay module. Recheck system operation.
7. Repair open or short to ground in Red wire between seat switch and left maxi-fuse block. Recheck system operation.
8. Repair open in Black wire between seat relay module and ground. Recheck system operation.
9. Repair open in Black wire between seat switch and ground. Recheck system operation.

Left Seat Does Not Manually Move In One Direction

1. Disconnect left seat switch connector. Operate left seat switch in inoperative position. Using DVOM, check resistance between appropriate left seat switch terminal (switch side) and ground. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 7).
2. Reconnect left seat switch connector. Disconnect left seat relay module 26-pin connector C1. Operate left seat switch in inoperative position. Using DVOM, check resistance between appropriate left seat relay module terminal (harness side) and ground. See WIRING DIAGRAMS. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 8).
3. Disconnect suspect seat motor. Connect a fused jumper wire between one seat motor terminal and battery voltage. Connect another jumper wire between other seat motor terminal and ground. If motor runs, go to next step. If motor does not run, go to step 9).
4. Disconnect left seat relay module Black 6-pin connector C3. Using DVOM, check resistance between appropriate left seat relay module harness connector C3 terminal and suspect motor harness connector terminal. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 10).
5. Disconnect left seat relay module Light Green 6-pin connector C2. Using DVOM, check resistance between appropriate left seat relay module harness connector C2 terminal and suspect motor harness connector terminal. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 11).
6. Replace left seat relay module. Recheck system operation.
7. Replace left seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
8. Repair open in appropriate circuit between left seat relay module connector C1 and left seat switch. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Recheck system operation.
9. Replace suspect seat motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
10. Repair open in appropriate circuit between left seat relay module connector C3 and suspect motor. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Recheck system operation.
11. Repair open in appropriate circuit between left seat relay module connector C2 and suspect motor. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Recheck system operation.

Right Seat Does Not Manually Move In One Direction

1. Disconnect right seat switch connector. Operate right seat switch in inoperative position. Using DVOM, check resistance between appropriate right seat switch terminal (switch side) and ground. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 7).
2. Reconnect right seat switch connector. Disconnect right seat relay module 26-pin connector C1. Operate right seat switch in inoperative position. Using DVOM, check resistance between appropriate right seat relay module terminal (harness side) and ground. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 8).
3. Disconnect suspect seat motor. Connect a fused jumper wire between one seat motor terminal and battery voltage. Connect another jumper wire between other seat motor terminal and ground. If motor runs, go to next step. If motor does not run, go to step 9).
4. Disconnect right seat relay module Black 6-pin connector C3. Using DVOM, check resistance between appropriate right seat relay module harness connector C3 terminal and suspect motor harness connector terminal. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 10).
5. Disconnect right seat relay module Light Green 6-pin connector C2. Using DVOM, check resistance between appropriate right seat relay module harness connector C2 terminal and suspect motor harness connector terminal. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 11).
6. Replace right seat relay module. Recheck system operation.
7. Replace right seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
8. Repair open in appropriate circuit between right seat relay module connector C1 and right seat switch. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Recheck system operation.
9. Replace suspect seat motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
10. Repair open in appropriate circuit between right seat relay module connector C3 and suspect motor. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Recheck system operation.
11. Repair open in appropriate circuit between right seat relay module connector C2 and suspect motor. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Recheck system operation.

1. Using test light, backprobe between inoperative seat switch connector terminal "H" (Red wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 4).
2. Using test light, backprobe between seat switch connector terminals "H" (Red wire) and "G" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 5).
3. Replace seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
4. Repair open or short to ground in Red wire between seat switch and left maxi-fuse block. Recheck system operation.
5. Repair open in Black wire between seat switch and ground. Recheck system operation.

Rear Of Seat Does Not Move Up & Down

1. Using test light, backprobe between inoperative seat switch connector Yellow wire terminal (terminal "F" on left switch, or terminal "E" on right switch) and ground. Move rear height switch up. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
2. Using test light, backprobe between inoperative seat switch connector Light Blue wire terminal (terminal "E" on left switch, or terminal "F" on right switch) and ground. Move rear height switch down. If test light illuminates, go to step 4). If test light does not illuminate, go to next step.
3. Replace seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
4. Using test light, backprobe between rear height motor connector terminal "B" (Yellow wire) and ground. Move rear height switch up. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
5. Using test light, backprobe between rear height motor connector terminal "A" (Light Blue wire) and ground. Move rear height switch down. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
6. Replace seat motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
7. Repair open in Yellow wire between appropriate seat switch and rear height motor. Recheck system operation.
8. Repair open in Light Blue wire between appropriate seat switch and rear height motor. Recheck system operation.

Front Of Seat Does Not Move Up & Down

1. Using test light, backprobe between inoperative seat switch connector Dark Green wire terminal (terminal "B" on left switch, or terminal "A" on right switch) and ground. Move front height switch up. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
2. Using test light, backprobe between inoperative seat switch connector Dark Blue wire terminal (terminal "A" on left switch, or terminal "B" on right switch) and ground. Move front height switch down. If test light illuminates, go to step 4). If test light does not illuminate, go to next step.
3. Replace seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
4. Using test light, backprobe between front height motor connector terminal "B" (Dark Green wire) and ground. Move front height switch up. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
5. Using test light, backprobe between front height motor connector terminal "A" (Dark Blue wire) and ground. Move front height switch down. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
6. Replace seat motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
7. Repair open in Dark Green wire between appropriate seat switch and front height motor. Recheck system operation.
8. Repair open in Dark Blue wire between appropriate seat switch and front height motor. Recheck system operation.

Entire Seat Does Not Move Forward Or Back

1. Using test light, backprobe between inoperative seat switch connector terminal "C" (Light Green wire) and ground. Move forward/back switch back. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
2. Using test light, backprobe between inoperative seat switch connector terminal "D" (Tan wire) and ground. Move forward/back switch forward. If test light illuminates, go to step 4). If test light does not illuminate, go to next step.
3. Replace seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
4. Using test light, backprobe between forward/back motor connector terminal "B" (Light Green wire) and ground. Move forward/back switch back. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
5. Using test light, backprobe between forward/back motor connector terminal "A" (Tan wire) and ground. Move forward/back switch forward. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
6. Replace seat motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
7. Repair open in Light Green wire between appropriate seat switch and forward/back motor. Recheck system operation.
8. Repair open in Tan wire between appropriate seat switch and forward/back motor. Recheck system operation.

Seat Back Does Not Recline Forward Or Back (Left Seat)

1. Using test light, backprobe between seat switch terminal "K" (Light Blue wire) and ground. Move recline switch back. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
2. Using test light, backprobe between seat switch terminal "M" (Light Green wire) and ground. Move recline switch forward. If test light illuminates, go to step 4). If test light does not illuminate, go to next step.
3. Replace seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
4. Using test light, backprobe between recliner motor terminal "A" (Light Blue wire) and ground. Move recline switch back. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
5. Using test light, backprobe between recliner motor terminal "B" (Light Green wire) and ground. Move recline switch forward. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
6. Replace power recliner motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
7. Repair open in Light Blue wire between recliner motor and left seat switch. Recheck system operation.
8. Repair open in Light Green wire between recliner motor and left seat switch. Recheck system operation.

Seat Back Does Not Recline Forward Or Back (Right Seat)

1. Using test light, backprobe between seat switch terminal "J" (Dark Green wire) and ground. Move recline switch back. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
2. Using test light, backprobe between seat switch terminal "L" (Dark Blue wire) and ground. Move recline switch forward. If test light illuminates, go to step 4). If test light does not illuminate, go to next step.
3. Replace seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
4. Using test light, backprobe between recliner motor terminal "B" (Dark Green wire) and ground. Move recline switch back. If test light illuminates, go to next step. If test light does not illuminate, go tostep 7).
5. Using test light, backprobe between recliner motor terminal "A" (Dark Blue wire) and ground. Move recline switch forward. If test light illuminates, go to next step. If test light does not illuminate, go tostep 8).
6. Replace power recliner motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
7. Repair open in Dark Green wire between recliner motor and right seat switch. Recheck system operation.
8. Repair open in Dark Blue wire between recliner motor and right seat switch. Recheck system operation.

Seat Does Not Heat (Concours & DeVille)

1. At inoperative seat, disconnect heated seat relay module connector. Using DVOM, check voltage between heated seat relay module harness connector terminal "D" (Orange wire) and ground. If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 22).
2. Check voltage between heated seat relay module harness connector terminals "D" (Orange wire) and "F" (Black wire). If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 23).
3. Disconnect heated seat switch connector. Turn ignition switch to RUN position. Check voltage between heated seat switch harness connector terminal "D" (Brown wire) and ground. If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 24).
4. Check voltage between heated seat switch harness connector terminal "D" (Brown wire) and "A" (Black wire). If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 23).
5. Using DVOM, check resistance of Pink wire between heated seat relay module harness connector terminal "B" and heated seat switch harness connector terminal "B". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 25).
6. Check resistance of Dark Blue wire between heated seat relay module harness connector terminal "C" and heated seat switch harness connector terminal "C". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 26).
7. Put heated seat switch in LOW position. Check resistance between heated seat switch harness connector terminals "D" (Brown wire) and "C" (Dark Blue wire). If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 27).
8. Put heated seat switch in LOW position. Check resistance between heated seat switch harness connector terminals "D" (Brown wire) and "B" (Pink wire). If resistance is about 200 ohms, go to next step. If resistance is not about 200 ohms, go to step 27).
9. Put heated seat switch in HIGH position. Check resistance between heated seat switch harness connector terminals "D" (Brown wire) and "B" (Pink wire). If resistance is about 310 ohms, go to next step. If resistance is not about 310 ohms, go to step 27).
10. Disconnect seat cushion connector C1. Disconnect seatback connector C2. Using DVOM, check resistance of Red/White wire between heated seat relay module harness connector terminal "A" and seat cushion harness connector C1 terminal "A". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 28).
11. Check resistance between heated seat relay module harness connector terminal "A" (Red/White wire) and ground. If resistance is less than 5 ohms, go to step 29). If resistance is not less than 5 ohms, go to next step.
12. Check resistance between seat cushion connector C1 component side terminals "A" (Red/White wire) and "B" (Brown wire). If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, go to step 30).
13. Check resistance of Brown wire between seat cushion harness connector C1 terminals "B" and seatback harness connector C2 terminal "A". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 31).
14. Check resistance between seat cushion harness connector C1 terminal "B" (Brown wire) and ground. If resistance is less than 5 ohms, go to step 32). If resistance is not less than 5 ohms, go to next step.
15. Check resistance between seatback connector C2 component-side terminals "A" (Brown wire) and "B" (Black wire). If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, go to step 33).
16. Check resistance between seatback harness connector C2 terminal "B" (Black wire) and ground. If resistance is less than 5 ohms, go to next step. If resistance is not less than 10 ohms, go to step 23).
17. Check resistance of Yellow/Black wire between heated seat relay module harness connector terminal "E" and seat cushion harness connector C1 terminal "C". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 34).
18. Check resistance between heated seat relay module harness connector terminal "E" (Yellow/Black wire) and ground. If resistance is less than 5 ohms, go to step 35). If resistance is not less than 5 ohms, go to next step.
19. Check resistance between seat cushion connector C1 component-side terminals "C" (Yellow/Black wire) and "D" (Black wire). If resistance is 850-1150 ohms, go to next step. If resistance is not 850-1150 ohms, go to step 30).
20. Check resistance between seat cushion harness connector C1 terminal "D" (Black wire) and ground. If resistance is about 5 ohms, go to step 23). If resistance is not about 5 ohms, go to next step.
21. Replace heated seat relay module. See «HEATED SEAT COILS & RELAY»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
22. Repair open or short to ground in Orange wire between heated seat relay module and trunk compartment fuse block. Recheck system operation.
23. Repair open in Black wire between ground and heated seat switch, heated seat relay module or seatback. Recheck system operation.
24. Repair open or short to ground in Brown wire between heated seat switch and trunk compartment fuse block. Recheck system operation.
25. Repair open in Pink wire between heated seat relay module and heated seat switch. Recheck system operation.
26. Repair open in Dark Blue wire between heated seat relay module and heated seat switch. Recheck system operation.
27. Replace heated seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
28. Repair open in Red/White wire between heated seat relay module and seat cushion. Recheck system operation.
29. Repair short to ground in Red/White wire between heated seat relay module and seat cushion. Recheck system operation.
30. Replace seat cushion. Recheck system operation.
31. Repair open in Brown wire between seat cushion and seatback. Recheck system operation.
32. Repair short to ground in Brown wire between seat cushion and seatback. Recheck system operation.
33. Replace seatback assembly. See «SEATBACK ASSEMBLY»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
34. Repair open in Yellow/Black wire between heated seat relay module and seat cushion. Recheck system operation.
35. Repair short to ground in Yellow/Black wire between heated seat relay module and seat cushion. Recheck system operation.

Seat Does Not Heat (Eldorado & Seville)

1. At inoperative seat, disconnect heated seat relay module connector. Using DVOM, check voltage between heated seat relay module harness connector terminal "D" (Orange wire) and ground. If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 27).
2. Check voltage between heated seat relay module harness connector terminals "D" (Orange wire) and "F" (Black wire). If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 28).
3. Disconnect heated seat switch connector. Turn ignition switch to RUN position. Check voltage between Brown wire terminal of heated seat switch harness connector and ground. If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 28).
4. Check voltage between Brown and Black wire terminals of heated seat switch harness connector. If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 23).
5. Using DVOM, check resistance of Pink or Pink/Black wire(s) between heated seat relay module harness connector and heated seat switch harness connector. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 30).
6. Using DVOM, check resistance of Light Blue or Light Blue/Black wire(s) between heated seat relay module harness connector and heated seat switch harness connector. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go tostep 31).
7. Put heated seat switch in LOW position. For left seat, check resistance between Brown and Light Blue wire terminals of heated seat switch harness connector. For right seat, check resistance between Brown and Light Blue/Black wire terminals of heated seat switch harness connector. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 32).
8. Put heated seat switch in LOW position. For left seat, check resistance between Brown and Pink wire terminals of heated seat switch harness connector. For right seat, check resistance between Brown and Pink/Black wire terminals of heated seat switch harness connector. If resistance is about 200 ohms, go to next step. If resistance is not about 200 ohms, go to step 32).
9. Put heated seat switch in HIGH position. For left seat, check resistance between Brown and Pink wire terminals of heated seat switch harness connector. For right seat, check resistance between Brown and Pink/Black wire terminals of heated seat switch harness connector. If resistance is about 310 ohms, go to next step. If resistance is not about 310 ohms, go to step 32).
10. Disconnect seat cushion connector C1 and C2. Using DVOM, check resistance of Red/White wire between heated seat relay module harness connector terminal "A" and seat cushion harness connector C1 terminal "A". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 33).
11. Check resistance between heated seat relay module harness connector terminal "A" (Red/White wire) and ground. If resistance is less than 5 ohms, go to step 34). If resistance is not less than 5 ohms, go to next step.
12. Check resistance between seat cushion connector C1 component side terminals "A" (Red/White wire) and "B" (Brown wire). If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, go to step 35).
13. Check resistance of Brown wire between seat cushion harness connector C1 terminals "B" and seat cushion harness connector C2 terminal "A". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 36).
14. Check resistance between seat cushion harness connector C1 terminal "B" (Brown wire) and ground. If resistance is less than 5 ohms, go to step 37). If resistance is not less than 5 ohms, go to next step.
15. Check resistance between seat cushion connector C2 component side terminals "A" (Brown wire) and "B" (Black wire). If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, go to step 35).
16. Disconnect seatback connector C3 and C4. Check resistance of Brown wire between seat cushion harness connector C2 terminal "B" and seatback harness connector C3 terminal "A". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 36).
17. Check resistance of Brown wire between seatback connector C3 component side terminals "A" and "B". If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, go to step 38).
18. Check resistance of Brown wire between seatback harness connector C3 terminal "B" and seatback harness connector C4 terminal "A". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 36).
19. Check resistance between seatback harness connector C3 terminal "B" (Brown wire) and ground. If resistance is less than 5 ohms, go to step 37). If resistance is not less than 5 ohms, go to next step.
20. Check resistance between seatback connector C4 component side terminals "A" (Brown wire) and "B" (Black wire). If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, go to step 38).
21. Check resistance between seatback harness connector C4 terminal "B" (Black wire) and ground. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 28).
22. Check resistance of Yellow/Black wire between heated seat relay module harness connector terminal "E" and seat cushion harness connector C1 terminal "C". If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 39).
23. Check resistance between heated seat relay module harness connector terminal "E" (Yellow/Black wire) and ground. If resistance is less than 5 ohms, go to step 40). If resistance is not less than 5 ohms, go to next step.
24. Check resistance between seat cushion connector C1 component side terminals "C" (Yellow/Black wire) and "D" (Black wire). If resistance is 850-1150 ohms, go to next step. If resistance is not 850-1150 ohms, go to step 35).
25. Check resistance between seat cushion harness connector C1 terminal "D" (Black wire) and ground. If resistance is about 5 ohms, go to step 28). If resistance is not about 5 ohms, go to next step.
26. Replace heated seat relay module. See «HEATED SEAT COILS & RELAY»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
27. Repair open or short to ground in Orange wire between heated seat relay module and trunk compartment fuse block. Recheck system operation.
28. Repair open in Black wire between ground and heated seat switch, heated seat relay module or seatback. Recheck system operation.
29. Repair open or short to ground in Brown wire between heated seat switch and trunk compartment fuse block. Recheck system operation.
30. Repair open in Pink or Pink/Black wire between heated seat relay module and heated seat switch. Recheck system operation.
31. Repair open in Light Blue or Light Blue/Black wire between heated seat relay module and heated seat switch. Recheck system operation.
32. Replace heated seat switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
33. Repair open in Red/White wire between heated seat relay module and seat cushion. Recheck system operation.
34. Repair short to ground in Red/White wire between heated seat relay module and seat cushion. Recheck system operation.
35. Replace seat cushion. Recheck system operation.
36. Repair open in appropriate Brown wire. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Recheck system operation.
37. Repair short to ground in appropriate Brown wire. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Recheck system operation.
38. Replace seatback assembly. See «SEATBACK ASSEMBLY»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
39. Repair open in Yellow/Black wire between heated seat relay module and seat cushion. Recheck system operation.
40. Repair short to ground in Yellow/Black wire between heated seat relay module and seat cushion. Recheck system operation.

Seat Heat Does Not Turn Off

1. At inoperative seat, disconnect heated seat switch connector. If seat cools down, go to step 5). If seat does not cool down, go to next step.
2. Disconnect heated seat relay module connector. If seat cools down, go to step 6). If seat does not cool down, go to next step.
3. If only seatback heats, go to step 7). If seat and seatback heats, go to next step.
4. Disconnect seat cushion connector C1. Using DVOM, check voltage between heated seat relay module harness connector C1 terminal "A" (Red/White wire) and ground. If reading is about zero volts, go to step 6). If reading is not about zero volts, go to next step. 5) Replace seat cushion. Recheck system operation.
5. Repair short to voltage in Red/White wire between heated seat relay module and seat cushion. Recheck system operation.
6. On Concours and DeVille, disconnect seatback connector C2. On Eldorado and Seville, disconnect seatback connector C3. On all models, use DVOM to check voltage between harness side of appropriate seatback connector terminal "A" (Brown wire) and ground. If reading is about zero volts, go to step 9). If reading is not about zero volts, go to next step.
7. Repair short to voltage in Brown wire between seat cushion and seatback. Recheck system operation.
8. Replace seatback assembly. See «SEATBACK ASSEMBLY»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.

MEMORY SEATS

Note. For information on memory seat systems, see MEMORY SYSTEMS article.

Lumbar Inoperative

1. Using test light, backprobe between inoperative lumbar switch terminal "E" (Orange wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go tostep 5).
2. Check for open or short to ground in Red wire between lumbar relays and left maxi-fuse block. If circuit is okay, go to next step. If circuit is not okay, go to step 6).
3. Check for open in Black wire between lumbar relays and ground. If circuit is okay, go to next step. If circuit is not okay, go to step 6).
4. Replace lumbar switch. Recheck system operation.
5. Repair open or short to ground in Orange wire between lumbar switch and trunk compartment fuse block. Recheck system operation.
6. Repair open or short to ground in appropriate wire. Recheck system operation.

Lumbar Does Not Move Up Or Down

1. Using test light, backprobe between inoperative up/down lumbar relay connector terminal "C" (Red wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 10).
2. Using test light, backprobe between up/down lumbar relay connector terminals "C" (Red wire) and "D" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 11).
3. Press lumbar switch up. Using test light, backprobe between up/down lumbar relay connector terminal "A" (Red wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 12).
4. Press lumbar switch down. Using test light, backprobe between up/down lumbar relay connector terminal "F" (Yellow wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 13).
5. Press lumbar switch up. Using test light, backprobe between up/down lumbar relay connector terminal "B" (Tan or Pink wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 15).
6. Press lumbar switch down. Using test light, backprobe between up/down lumbar relay connector terminal "E" (Purple or Orange wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 15).
7. Check for open or short to ground in Tan or Pink wire between up/down lumbar relay and up/down lumbar motor. If circuit is okay, go to next step. If circuit is not okay, go to step 16).
8. Check for open or short to ground in Purple or Orange wire between up/down lumbar relay and up/down lumbar motor. If circuit is okay, go to next step. If circuit is not okay, go to step 16).
9. Replace up/down lumbar motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
10. Repair open or short to ground in Red wire between up/down lumbar relay and splice S352 or S356. Recheck system operation.
11. Repair open in Black wire between up/down lumbar relay and splice S351, S354 or S357. Recheck system operation.
12. Check for open or short to ground in Red wire between up/down lumbar relay and lumbar switch. If circuit is okay, go to next step. If circuit is not okay, go to step 16).
13. Check for open or short to ground in Yellow wire between up/down lumbar relay and lumbar switch. If circuit is okay, go to next step. If circuit is not okay, go to step 16).
14. Replace lumbar switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
15. Replace up/down lumbar relay. Recheck system operation.
16. Repair open or short to ground in appropriate wire. Recheck system operation.

Lumbar Does Not Move In Or Out

1. Using test light, backprobe between inoperative in/out lumbar relay connector terminal "C" (Red wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 10).
2. Using test light, backprobe between in/out lumbar relay connector terminals "C" (Red wire) and "D" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 11).
3. Press lumbar switch in. Using test light, backprobe between in/out lumbar relay connector terminal "A" (Gray wire) and ground. If test light does not illuminate, go to step 12). If test light illuminates, go to next step.
4. Press lumbar switch out. Using test light, backprobe between in/out lumbar relay connector terminal "F" (Purple wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 13).
5. Press lumbar switch in. Using test light, backprobe between in/out lumbar relay connector terminal "B" (Pink or White wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 15).
6. Press lumbar switch out. Using test light, backprobe between in/out lumbar relay connector terminal "E" (Dark Blue wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 15).
7. Check for open or short to ground in Pink or White wire between in/out lumbar relay and in/out lumbar motor. If circuit is okay, go to next step. If circuit is not okay, go to step 16).
8. Check for open or short to ground in Dark Blue wire between in/out lumbar relay and in/out lumbar motor. If circuit is okay, go to next step. If circuit is not okay, go to step 16).
9. Replace in/out lumbar motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
10. Repair open or short to ground in Red wire between in/out lumbar relay and splice S352 or S356. Recheck system operation.
11. Repair open in Black wire between in/out lumbar relay and splice S351, S354 or S357. Recheck system operation.
12. Check for open or short to ground in Gray wire between in/out lumbar relay and lumbar switch. If circuit is okay, go to next step. If circuit is not okay, go to step 16).
13. Check for open or short to ground in Purple wire between in/out lumbar relay and lumbar switch. If circuit is okay, go to next step. If circuit is not okay, go to step 16).
14. Replace lumbar switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
15. Replace in/out lumbar relay. Recheck system operation.
16. Repair open or short to ground in appropriate wire. Recheck system operation.

Lumbar Moves But Motion Is Rough

1. Remove SEATS circuit breaker (30-amp) from left maxi-fuse block. Disconnect wires from terminals "B" and "E" of appropriate lumbar relay associated with direction of rough motion. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Connect a temporary ground connection to one of the wires. Connect a temporary battery voltage connection to other wire. Reverse battery voltage and ground connections to reverse motor direction. If lumbar support moves smoothly and with no unusual noises from one end of travel to other, go to next step. If lumbar support does not move smoothly or makes unusual noises from one end of travel to other, go to step 4).
2. Remove temporary battery voltage and ground sources. Reconnect motor circuits at lumbar relay. If up/down motion is rough, disconnect wires from terminals "C" and "D" of lumbar switch. If in/out motion is rough, disconnect wires from terminals "A" and "B" of lumbar switch. See «WIRING DIAGRAMS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Connect a temporary ground connection to one of the wires. Connect a temporary battery voltage connection to other wire. Reverse battery voltage and ground connections to reverse motor direction. If lumbar support moves smoothly and continuously from one end of travel to other, go to next step. If lumbar support does not move smoothly and continuously from one end of travel to other, go to step 5).
3. Replace lumbar switch. See «POWER SWITCHES»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
4. Replace suspect lumbar motor. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION. Recheck system operation.
5. Replace suspect lumbar relay. Recheck system operation.

REMOVAL & INSTALLATION

Removal & Installation (Concours & DeVille)

Move seat to fully forward and up positions. Remove seat anchor bolts. Tilt seat forward, and disconnect electrical connectors. Using assistant, pull seat rearward and disengage seat from front retaining hooks. To install, reverse removal procedure. Tighten seat anchor bolts to 24 ft. lbs. (32 N.m). Check operation of seat, and adjust if necessary. See ADJUSTMENTS .

Removal & Installation (Eldorado & Seville)

Move seat to fully forward and up positions. Remove rear anchor-to-floor pan nuts. Tilt seat forward, and disconnect electrical connectors. Using assistant, pull seat rearward and disengage seat from front retaining hooks. To install, reverse removal procedure. Check operation of seat, and adjust if necessary. See ADJUSTMENTS .

POWER LUMBAR ASSEMBLY

Note. For removal and installation procedures for power lumbar motors, see SEAT MOTORS .

Remove seatback cover and cushion. See SEATBACK & SEAT CUSHION COVERS. Disconnect electrical connectors. Open retainers on 4 corners, and remove power lumbar assembly from vehicle. (Scheme 2) To install, reverse removal procedure.

Scheme 2

Removal & Installation (Power Seat/Memory Seat Switches)

1. Using 1/2" wide, flat-blade screwdriver, pry up on rear edge of trim panel. Insert blade 3/4" into door trim panel, and press firmly toward switch plate to disengage retention clip. Pull screwdriver upward while pressing firmly toward plate, and pull plate from trim panel. CAUTION: Ensure retention clip has been completely disengaged, or switch plate or clip may be damaged.
2. Disconnect electrical connectors. Remove switch plate. To install, connect electrical connectors. Install switch plate into trim panel evenly, and press into place until clips on both ends are engaged.

Removal & Installation (Power Recliner, Lumbar & Heated Seat Switches)

Remove seat side trim panel. Using flat-blade tool, carefully pry rear edge of switch escutcheon from trim panel. Release tabs, and remove switch from switch escutcheon. To install, reverse removal procedure.

Removal & Installation (Power Seat & Recliner Switches)

Pull switch knobs from switch. Remove screws and seat side trim panel. Disconnect electrical connector. Remove screw and seat switch. To install, reverse removal procedure.

Removal & Installation (Heated Seat & Lumbar Switches)

Open console. Remove storage bin. Disconnect electrical connectors. Using thin flat-blade screwdriver, release tabs on each side of switch, and remove switch assembly from console. To install, reverse removal procedure.

1. Remove power seat. See POWER SEAT. Remove seatback assembly. See «SEATBACK ASSEMBLY»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Disconnect seat cushion "J" retainers. Remove seat cushion cover and foam. Disconnect horizontal and vertical drive cables by squeezing oblong connector at motors, gearnuts or adjuster drives.
2. Remove memory seat module (if equipped). See MEMORY SYSTEMS article. Remove seat motors. See «SEAT MOTORS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system__seat-motors) . To install, reverse removal procedure. Check operation of seat, and adjust if necessary. See «ADJUSTMENTS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) .

SEAT MOTORS

Note. Removal and installation information for power lumbar motors on DeVille are not available from manufacturer.

Removal & Installation (Seat Adjuster Motors)

1. Move seat to full up position. Remove power seat. See POWER SEAT. Place seat upside-down on a clean surface. Disconnect electrical connectors to motors. Disconnect horizontal and vertical drive cables by squeezing oblong connector at motors, gearnuts or adjuster drives.
2. Remove nut retaining front of motor support bracket to inboard adjuster. Partially withdraw motor support bracket from adjuster and gearnut drives. Remove seat adjuster motors. (Scheme 3) To install, reverse removal procedure.

Removal & Installation (Power Lumbar Motor - Concours, Eldorado & Seville)

Remove seatback cover. See SEATBACK & SEAT CUSHION COVERS. Remove 6 push-in fasteners retaining seat frame back cover. (Scheme 2) Remove seat frame back cover. Remove drive cables to lumbar motor. Remove lumbar motor electrical connector. Remove 2 screws and power lumbar motor. To install, reverse removal procedure.

Removal & Installation (Power Recliner Motor)

Move seat to full up position. Remove power seat. See POWER SEAT. Place seat upside-down on a clean surface. Disconnect power recliner motor electrical connector. Disconnect horizontal and vertical drive cables by squeezing oblong connector at motors, gearnuts or adjuster drives. Remove power recliner motor. (Scheme 3) To install, reverse removal procedure.

Scheme 3

1. Remove seatback cover. See «SEATBACK & SEAT CUSHION COVERS»(/cadillac/eldorado/x-1992-2002/remont/seats/#power-seat-system) . Remove 2 screws from front and back of seat cushion trim panel, slide panel upward to release center retainer, and remove trim panel. Disconnect power seat switch electrical connector.
2. Disconnect "J" retainers at bottom of seatback cover. Disconnect electrical connectors, as necessary. Remove 2 roll pins securing power recliner actuator to seatback hinge. Remove 2 seat hinge bolts. Remove seatback assembly. To install, reverse removal procedure. Tighten hinge bolts to 18 ft. lbs. (24 N.m).

Removal & Installation (Seatback Cover)

Using Head Restraint Lock Releaser (J-39509), remove head restraint. Remove 2 screws from bottom corners of trim cover. Lift up and outward to release hooks, and remove trim cover. Release "J" retainer at bottom of seatback. Disconnect electrical connectors, as necessary. Remove seat cover with cushion up off of seatback frame. To install, reverse removal procedure.

Removal & Installation (Seat Cushion Cover)

Remove seatback assembly. See SEATBACK ASSEMBLY. Remove inner seat belts. Disconnect electrical connectors (if equipped). Remove seat cushion cover. To install, reverse removal procedure.

Removal & Installation (Heated Seat Coils)

If heated seat coils are malfunctioning, entire cover must be replaced. See SEATBACK & SEAT CUSHION COVERS .

Removal & Installation (Heated Seat Relay)

Move seat to full up position. Remove seat. See POWER SEAT. Place seat upside-down on a clean surface. Disconnect electrical connector. Remove heated seat relay from bracket. (Scheme 3) To install, reverse removal procedure.

Power Seats Wiring Diagram (Concours & DeVille). Scheme 4

Power Seats Wiring Diagram (Eldorado & Seville). Scheme 5

Power Heated Seats Wiring Diagram (Concours & DeVille). Scheme 6

Power Heated Seats Wiring Diagram (Eldorado & Seville With Full Console). Scheme 7

Power Heated Seats Wiring Diagram (Eldorado & Seville With Mini Console). Scheme 8

Power Lumbar Seats Wiring Diagram. Scheme 9

See also:
• MEMORY SYSTEMS
• HORIZONTAL ACTUATOR
• COMPONENT LOCATIONS
• POWER SWITCHES
• SEAT MOTORS