Power Seat System Cadillac DeVille Concours I final

DESCRIPTION

Power seats operate using toggle switches located on seat side or in door panel. 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. Memory seats, power seat recliners, heated seats, power lumbar, and massaging lumbar are available as an option.

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/back movement of entire seat assembly. Drive cables connect motor to gearnuts, which turn jackscrews and adjusters at each side of seat. Power operated reclining seatback use one motor per side, mounted to seat frame. Recliner motor moves dual reclining actuators on each side of seat with a cable.

Eldorado is equipped with inertia seatback locks on the front bucket seats. This enables the seatback to be moved forward to allow easy access to rear seat without having to depress a release button or lever. On sudden stops, deceleration or if the nose of the vehicle is pointed down at 20 percent or greater incline, the inertia locks prevent the seatback from moving forward.

LUMBAR SEATS

Four-way power lumbar support is an option on DeVille and Eldorado. Power is supplied by PWR SEAT (30-amp) circuit breaker in fuse block. Both front seats are controlled by the lumbar switch and two reversible motors which operate separately from each other. Each motor contains an electronic circuit breaker. Lumbar switch is located on the lower outboard side of each seat, near door and directly controls functions of lumbar motors.

Massaging lumbar is an option on DeVille and Eldorado. Pushing up on lumbar control switch will activate massage feature for 10 minutes. Massage cycle can be interrupted by pushing down briefly on lumbar control switch. Lumbar support can be adjusted during massage cycle by moving lumbar control switch forward for increased support and rearward for decreased support. Massage feature will continue to operate for complete 10 minute cycle even if ignition is turned to OFF position, unless interrupted.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

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. Disconnect 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 reaches 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 INSPECTION

Note. Before performing SYSTEM CHECK, check the following items to eliminate common problems

1. If power accessory circuit breaker opens whenever power seat switch is operated, check circuits for a short to ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) .
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.
3. Ensure ground connections are clean and tight.
4. Before replacing components, check connectors and in-line connectors for looseness, corrosion or opens.
5. Check for proper operation and installation of aftermarket components, such as alarms, cellular phones or stereo equipment that may effect operation of related systems and/or components.
6. If system exhibits jerky horizontal operation, check for improper lubrication of adjuster shoes and channels.
7. If one adjuster will not operate horizontally, check for disconnected or damaged horizontal drive cable. Check for inoperative horizontal actuator.
8. If one adjuster will not operate vertically, check for disconnected or damaged vertical drive cable. Check vertical gearnut inoperative. Replace vertical actuator assembly if necessary.
9. On heated seat systems, check HTD SEAT R fuse in rear fuse block. If fuse is blown, check for short to ground in Orange wire.
10. Check rear fuse block HTD SEAT L fuse. If fuse is blown, check for short to ground in Orange wire.
11. Check CONSOLE fuse in rear fuse block. If fuse is blown, check for short to ground in Brown wire. If problem still exists, perform appropriate SYSTEM CHECK. See «SYSTEM CHECKS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__system-checks) .

SYSTEM CHECKS

Note. Before performing any system checks, perform PRELIMINARY INSPECTION .

1. Move driver seat rear height switch up and down. Rear of driver seat should move up and down. Move driver seat front height switch up and down. Front of driver seat should move up and down. Move driver seat switch forward and back. Entire driver seat should move forward and back.
2. Move driver seat recline switch forward and back. Entire driver seat seatback should move forward and back. Move passenger seat rear height switch up and down. Rear of passenger seat should move up and down. If seat does not respond as specified, perform appropriate system test. See «SYMPTOM INDEX»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) table under SYSTEM TESTS.

Heated Seats

1. Turn ignition switch to ON position. Turn driver's heated seat switch to LO position. Seat will heat up after about one minute. If seat does not respond as specified, go to «TEST 9: SEAT DOES NOT HEAT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-9-seat-does-not-heat) under SYSTEM TESTS.
2. Turn driver's heated seat switch to HI position. Seat temperature will increase after about one minute. If seat does not respond as specified, go to «TEST 9: SEAT DOES NOT HEAT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-9-seat-does-not-heat) under SYSTEM TESTS.
3. Turn driver's heated seat switch to OFF position. Seat will cool down and remain cool. If seat does not respond as specified, go to «TEST 10: SEAT HEAT DOES NOT TURN OFF»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-10-seat-heat-does-not) under SYSTEM TESTS.
4. Turn passenger's heated seat switch to LO position. Seat will heat up after about one minute. If seat does not respond as specified, go to «TEST 9: SEAT DOES NOT HEAT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-9-seat-does-not-heat) under SYSTEM TESTS.
5. Turn passenger's heated seat switch to HI position. Seat temperature will increase after about one minute. If seat does not respond as specified, go to «TEST 9: SEAT DOES NOT HEAT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-9-seat-does-not-heat) under SYSTEM TESTS.
6. Turn passenger's heated seat switch to OFF position. Seat will cool down and remain cool. If seat does not respond as specified, go to «TEST 10: SEAT HEAT DOES NOT TURN OFF»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-10-seat-heat-does-not) under SYSTEM TESTS.

Lumbar Support

1. While sitting in driver's front seat, move lumbar switch to up and down positions. Lumbar support should move up and down smoothly. If seat does not respond as specified, go to «TEST 12: LUMBAR DOES NOT MOVE UP OR DOWN»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-12-lumbar-does-not-move) or «TEST 11: ALL LUMBAR FUNCTIONS INOPERATIVE»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-11-all-lumbar-functions-inoperative) under SYSTEM TESTS.
2. Operate driver's lumbar switch to in and out positions. Lumbar support should move in and out smoothly. If seat does not respond as specified, go to «TEST 13: LUMBAR DOES NOT MOVE IN OR OUT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-13-lumbar-does-not-move) or «TEST 11: ALL LUMBAR FUNCTIONS INOPERATIVE»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-11-all-lumbar-functions-inoperative) under SYSTEM TESTS.
3. While sitting in passenger's seat, move lumbar switch to up and down positions. Lumbar support should move up and down smoothly. If seat does not respond as specified, go to «TEST 12: LUMBAR DOES NOT MOVE UP OR DOWN»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-12-lumbar-does-not-move) or «TEST 11: ALL LUMBAR FUNCTIONS INOPERATIVE»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-11-all-lumbar-functions-inoperative) under SYSTEM TESTS.
4. Operate passenger's lumbar switch to in and out positions. Lumbar support should move in and out smoothly. If seat does not respond as specified, go to «TEST 13: LUMBAR DOES NOT MOVE IN OR OUT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-13-lumbar-does-not-move) or «TEST 11: ALL LUMBAR FUNCTIONS INOPERATIVE»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__test-11-all-lumbar-functions-inoperative) under SYSTEM TESTS.

SYSTEM TESTS

Note. For memory seat system, see appropriate wiring diagram in MEMORY SYSTEMS article.

SYMPTOM INDEX

TEST 1: ALL POWER SEAT FUNCTIONS INOPERATIVE

Note. After repairs, perform power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

1. Operate horn. If horns operate properly, go to next step. If horns do not operate properly, go to step 4 .
2. Check front and rear ashtray lamps. If lamps operate properly, go to next step. If lamps do not operate properly, go to step 5 .
3. Repair open in Red wire between splices S101 and S311. Splice S101 is located in body harness approximately 5.5" (14 mm) on the engine compartment side of firewall. Splice 311 is located under driver seat, approximately 13" (33 mm) from breakout of ground wire. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) .
4. Repair open in Red wire between left side underhood fuse block and splice S311. Splice S311 is located under driver seat, approximately 13" (33 mm) from breakout of ground wire. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) .
5. Repair open in Black wire between splice S313 and ground connection G302. Splice S313 is located under driver seat, approximately 2.5" (6 mm) from breakout of ground wire. Ground G302 is located under driver seat, on seat pan bar No. 3. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) .

TEST 2: ALL POWER SEAT FUNCTIONS ON ONE SIDE ARE INOPERATIVE

Note. After repairs, perform power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

DeVille

1. Disconnect seat relay module Black 6-pin connector C3 at inoperative seat. Seat relay module is located under respective seat. Using DVOM, check voltage between ground and seat relay module harness connector C3 terminal "A" (Red wire). (Scheme 1) If reading is 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 6.
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 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 7.
3. Disconnect seat switch harness 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 driver's seat or terminal "B" for passenger's seat). (Scheme 2) If reading is 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 8.
4. Reconnect seat relay module connectors C2 and C3. For driver's seat, connect a fused jumper wire between seat switch harness connector terminal "F" (Gray wire) and ground. For passenger's 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, replace seat relay module. See «HEATED SEAT RELAY MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
5. Replace seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. Recheck system operation.
6. Repair open in Red wire between splice and seat relay module. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
7. Repair open in Black wire between seat relay module and ground connection G302. Ground connection G302 is located under left front seat. See WIRING DIAGRAMS.
8. Repair open in Black wire between seat switch and ground connection behind respective front kick panel. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).

Scheme 1

Scheme 2

Eldorado

1. Using test light connected to ground, backprobe inoperative seat switch connector terminal "H" (Red wire). (Scheme 3) If test light comes on, go to next step. If test light does not come on, go to step 4.
2. Using test light, backprobe between seat switch connector terminals "H" (Red wire) and "G" (Black wire). If test light comes on, go to next step. If test light does not come on, go to step 5.
3. Replace seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Repair open in Red wire between seat switch and left maxi-fuse block. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
5. Repair open in Black wire between seat switch and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).

Scheme 3

TEST 3: DRIVER'S SEAT DOES NOT MOVE IN ONE DIRECTION

Note. After repairs, perform power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

1. Disconnect driver's seat switch connector. Connect DVOM between driver's seat switch terminal "J" and appropriate driver's seat switch terminal for inoperative circuit (switch side). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) to determine proper driver's seat switch terminal for inoperative circuit. (Scheme 2) Operate driver's seat switch in inoperative position while observing DVOM reading. If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 6.
2. Reconnect driver's seat switch connector. Disconnect driver's seat relay module 26-pin connector C1, located under driver's seat. Connect DVOM between ground and appropriate driver's seat relay module connector C1 terminal for inoperative circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) to determine proper driver's seat relay module connector C1 terminal for inoperative circuit. (Scheme 4) Operate driver's seat switch in inoperative position while observing DVOM reading. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 7.
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 8.
4. Disconnect driver's seat relay module Black 6-pin connector C3 located under driver's seat. Using DVOM, measure resistance between suspect motor harness connector terminal and appropriate driver's seat relay module connector C3 terminal for inoperative circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) to determine proper driver's seat relay module connector C3 terminal for inoperative circuit. (Scheme 1) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 9.
5. Disconnect driver's seat relay module Light Green 6-pin connector C2. Using DVOM, measure resistance between suspect motor harness connector terminal and appropriate driver's seat relay module connector C2 terminal for inoperative circuit. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) to determine proper driver's seat relay module connector C2 terminal for inoperative circuit. (Scheme 1) If resistance is less than 5 ohms, replace driver's seat relay module. See «HEATED SEAT RELAY MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION. If resistance is 5 ohms or more, go to step 10.
6. Replace driver's seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
7. Repair open in appropriate circuit between driver's seat relay module connector C1 and driver's seat switch.
8. Replace suspect seat motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
9. Repair open in appropriate circuit between driver's seat relay module connector C3 and suspect motor.
10. Repair open in appropriate circuit between driver's seat relay module connector C2 and suspect motor.

Scheme 4

TEST 4: REAR OF SEAT DOES NOT MOVE UP & DOWN

Note. After repairs, perform power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

1. Using test light connected to ground, backprobe inoperative seat switch connector Yellow wire terminal. Move rear height switch up. If test light comes on, go to next step. If test light does not come on, go to step 3 .
2. Using test light connected to ground, backprobe inoperative seat switch connector Light Blue wire terminal. Move rear height switch down. If test light comes on, go to step 4 . If test light does not come on, go to next step.
3. Replace inoperative seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Using test light connected to ground, backprobe rear height motor connector terminal "B" (Yellow wire). Move rear height switch up. If test light comes on, go to next step. If test light does not come on, go to step 7 .
5. Using test light connected to ground, backprobe rear height motor connector terminal "A" (Light Blue wire). Move rear height switch down. If test light comes on, go to next step. If test light does not come on, go to step 8 .
6. Replace inoperative seat motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
7. Repair open in Yellow wire between appropriate seat switch and rear height motor. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) .
8. Repair open in Light Blue wire between appropriate seat switch and rear height motor. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) .

TEST 5: FRONT OF SEAT DOES NOT MOVE UP & DOWN

Note. After repairs, perform power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

1. Using test light connected to ground, backprobe inoperative seat switch connector Dark Green wire terminal. Move front height switch up. If test light comes on, go to next step. If test light does not come on, go to step 3 .
2. Using test light connected to ground, backprobe inoperative seat switch connector Dark Blue wire terminal. Move front height switch down. If test light comes on, go to step 4 . If test light does not come on, go to next step.
3. Replace inoperative seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Using test light connected to ground, backprobe front height motor connector terminal "B" (Dark Green wire). Move front height switch up. If test light comes on, go to next step. If test light does not come on, go to step 7 .
5. Using test light connected to ground, backprobe front height motor connector terminal "A" (Dark Blue wire). Move front height switch down. If test light comes on, go to next step. If test light does not come on, go to step 8 .
6. Replace inoperative seat motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
7. On DeVille, check for faulty seat relay module. On all models, check for open in Dark Green wire between appropriate seat switch and front height motor. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) . Repair as necessary.
8. On DeVille, check for faulty seat relay module. On all models, check for open in Dark Blue wire between appropriate seat switch and front height motor. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) . Repair as necessary.

TEST 6: ENTIRE SEAT DOES NOT MOVE FORWARD OR BACK

Note. After repairs, perform power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

1. If driver's seat does not move forward or back, connect test light (backprobe) between ground and driver's seat switch connector terminal "E" (Brown wire). If passenger's seat does not move forward or back, connect test light (backprobe) between ground and passenger's seat switch connector terminal "F" (Light Green wire). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) . On all applications, move forward/back seat switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 3 .
2. If driver's seat does not move forward or back, connect test light (backprobe) between ground and driver's seat switch connector terminal "F" (Gray wire). If passenger's seat does not move forward or back, connect test light (backprobe) between ground and passenger's seat switch connector terminal "E" (Tan wire). On all applications, move forward/back seat switch to forward position. If test light comes on, go to step 4 . If test light does not come on, go to next step.
3. Replace inoperative seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Using test light connected to ground, backprobe forward/back motor connector terminal "B" (Light Green wire). Move forward/back seat switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 7 .
5. Using test light connected to ground, backprobe forward/back motor connector terminal "A" (Tan wire). Move forward/back seat switch to forward position. If test light comes on, go to next step. If test light does not come on, go to step 8 .
6. Replace inoperative seat motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
7. Check for faulty seat relay module or open in Light Green wire between appropriate seat switch and forward/back motor. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) . Repair as necessary.
8. Check for faulty seat relay module or open in Tan wire between appropriate seat switch and forward/back motor. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) . Repair as necessary.

1. Using test light connected to ground, backprobe inoperative seat switch connector terminal "C" (Light Green wire). (Scheme 3) Move forward/back seat switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 3.
2. Using test light connected to ground, backprobe inoperative seat switch connector terminal "D" (Tan wire). Move forward/back seat switch to forward position. If test light comes on, go to step 4. If test light does not come on, go to next step.
3. Replace inoperative seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Using test light connected to ground, backprobe forward/back motor connector terminal "B" (Light Green wire). Move forward/back seat switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 7.
5. Using test light connected to ground, backprobe forward/back motor connector terminal "A" (Tan wire). Move forward/back seat switch to forward position. If test light comes on, go to next step. If test light does not come on, go to step 8.
6. Replace inoperative seat motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
7. Repair open in Light Green wire between appropriate seat switch and forward/back motor. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
8. Repair open in Tan wire between appropriate seat switch and forward/back motor. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).

TEST 7: DRIVER'S SEAT BACK DOES NOT RECLINE FORWARD OR BACK

Note. After repairs, perform power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

1. Using test light connected to ground, backprobe driver's seat switch terminal "A" (Light Blue wire). (Scheme 2) Move recline switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 3.
2. Using test light connected to ground, backprobe driver's seat switch terminal "B" (Light Green wire). Move recline switch to forward position. If test light comes on, go to step 4. If test light does not come on, go to next step.
3. Replace driver's seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Using test light connected to ground, backprobe recliner motor terminal "A" (Light Blue wire). Move recline switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 7.
5. Using test light connected to ground, backprobe recliner motor terminal "B" (Light Green wire). Move recline switch to forward position. If test light comes on, go to next step. If test light does not come on, go to step 8.
6. Replace power recliner motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
7. Check for faulty seat relay module or open in Light Blue wire between recliner motor and driver's seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). Repair as necessary.
8. Check for faulty seat relay module or open in Light Green wire between recliner motor and driver's seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). Repair as necessary.

1. Using test light connected to ground, backprobe driver's seat switch terminal "K" (Light Blue wire). (Scheme 3) Move recline switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 3.
2. Using test light connected to ground, backprobe driver's seat switch terminal "M" (Light Green wire). Move recline switch to forward position. If test light comes on, go to step 4. If test light does not come on, go to next step.
3. Replace driver's seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Using test light connected to ground, backprobe recliner motor terminal "A" (Light Blue wire). Move recline switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 7.
5. Using test light connected to ground, backprobe recliner motor terminal "B" (Light Green wire). Move recline switch to forward position. If test light comes on, go to next step. If test light does not come on, go to step 8.
6. Replace power recliner motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
7. Repair open in Light Blue wire between recliner motor and driver's seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
8. Repair open in Light Green wire between recliner motor and driver's seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).

TEST 8: PASSENGER'S SEAT BACK DOES NOT RECLINE FORWARD OR BACK

Note. After repairs, perform power seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

1. Using test light connected to ground, backprobe passenger's seat switch Dark Green/White wire terminal. Move recline switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 3 .
2. Using test light connected to ground, backprobe passenger's seat switch Gray/Black wire terminal. Move recline switch to forward position. If test light comes on, go to step 4 . If test light does not come on, go to next step.
3. Replace inoperative seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Using a test light connected to ground, backprobe recliner motor terminal "A" (Dark Blue wire). Move recline switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 7 .
5. Using test light connected to ground, backprobe recliner motor terminal "B" (Dark Green wire). Move recline switch to forward position. If test light comes on, go to next step. If test light does not come on, go to step 8 .
6. Replace power recliner motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
7. Check for faulty seat relay module or open in Dark Blue wire between recliner motor and passenger's seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) . Repair as necessary.
8. Check for faulty seat relay module or open in Dark Green wire between recliner motor and passenger's seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) . Repair as necessary.

1. Using test light connected to ground, backprobe passenger's seat switch terminal "J" (Dark Blue wire). (Scheme 3) Move recline switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 3.
2. Using test light connected to ground, backprobe passenger's seat switch terminal "L" (Dark Green wire). Move recline switch to forward position. If test light comes on, go to step 4. If test light does not come on, go to next step.
3. Replace inoperative seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
4. Using a test light connected to ground, backprobe recliner motor terminal "B" (Dark Blue wire). Move recline switch to back position. If test light comes on, go to next step. If test light does not come on, go to step 7.
5. Using test light connected to ground, backprobe recliner motor terminal "A" (Dark Green wire). Move recline switch to forward position. If test light comes on, go to next step. If test light does not come on, go to step 8.
6. Replace power recliner motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
7. Repair open in Dark Blue wire between recliner motor and passenger's seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
8. Repair open in Dark Green wire between recliner motor and passenger's seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).

TEST 9: SEAT DOES NOT HEAT

Note. After repairs, perform heated seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

1. At inoperative seat, disconnect heated seat relay module Black 6-pin connector. Heated seat relay module is located under respective seat. Using DVOM, check voltage between ground and heated seat relay module harness connector terminal "D" (Orange wire). (Scheme 5) If reading is 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 22.
2. Turn ignition switch to RUN position. Check voltage between heated seat relay module harness connector terminals "D" (Orange wire) and "F" (Black wire). If reading is 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 23.
3. Disconnect heated seat switch connector. Ensure ignition switch is in RUN position. Check voltage between ground and heated seat switch harness connector terminal "D" (Brown wire). If reading is 10-15 volts, go to next step. If reading is not 10-15 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 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 23.
5. Turn ignition switch to OFF position. 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 0-2 ohms, go to next step. If resistance is not 0-2 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 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 26.
7. Put heated seat switch in LO position. Check resistance between heated seat switch harness connector terminals "D" (Brown wire) and "C" (Dark Blue wire). If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 27.
8. Ensure heated seat switch is in LO position. Check resistance between heated seat switch harness connector terminals "D" (Brown wire) and "B" (Pink wire). If resistance is approximately 200 ohms, go to next step. If resistance is not approximately 200 ohms, go to step 27.
9. Put heated seat switch in HI position. Check resistance between heated seat switch harness connector terminals "D" (Brown wire) and "B" (Pink wire). If resistance is approximately 310 ohms, go to next step. If resistance is not approximately 310 ohms, go to step 27.
10. Disconnect seat cushion Black 4-pin connector C1. Disconnect seatback Light Green 2-pin 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 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 28.
11. Check resistance between ground and heated seat relay module harness connector terminal "A" (Red/White wire). If resistance is less than 5 ohms, go to step 29. If resistance is 5 ohms or more, go to next step.
12. Check resistance between component-side of seat cushion connector C1 terminals "A" (Red/White wire) and "B" (Brown wire). If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 30.
13. Check resistance of Brown wire between seat cushion harness connector C1 terminal "B" and seatback harness connector C2 terminal "A". If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 31.
14. Check resistance between ground and seat cushion harness connector C1 terminal "B" (Brown wire). If resistance is less than 5 ohms, go to step 32. If resistance is 5 ohms or more, go to next step.
15. Check resistance between component-side of seatback connector C2 terminals "A" (Brown wire) and "B" (Black wire). If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 33.
16. Check resistance between ground and seatback harness connector C2 terminal "B" (Black wire). If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 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 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 34.
18. Check resistance between ground and heated seat relay module harness connector terminal "E" (Yellow/Black wire). If resistance is less than 5 ohms, go to step 35. If resistance is 5 ohms or more, go to next step.
19. With seat cushion at room temperature, check resistance between component-side of seat cushion connector C1 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 ground and seat cushion harness connector C1 terminal "D" (Black wire). If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 23.
21. Replace heated seat relay module. See «HEATED SEAT RELAY MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
22. Repair open in Orange wire between heated seat relay module and trunk compartment fuse block. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
23. Check for open in Black wire between heated seat switch, heated seat relay module, heated seatback, heated seat cushion and ground connection G302. Ground connection G302 is located under left front seat. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). Repair as necessary.
24. Repair open in Brown wire between heated seat switch and splice S312. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
25. Repair open in Pink wire between heated seat relay module and heated seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
26. Repair open in Dark Blue wire between heated seat relay module and heated seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
27. Replace heated seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
28. Repair open in Red/White wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
29. Repair short to ground in Red/White wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
30. Replace seat cushion. See «SEATBACK & SEAT CUSHION COVERS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
31. Repair open in Brown wire between seat cushion and seatback. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
32. Repair short to ground in Brown wire between seat cushion and seatback. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
33. Replace heated seatback cover. See «SEATBACK & SEAT CUSHION COVERS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
34. Repair open in Yellow/Black wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
35. Repair short to ground in Yellow/Black wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).

Scheme 5

1. At inoperative seat, disconnect heated seat relay module Black 6-pin connector. Heated seat relay module is located under respective seat. Using DVOM, check voltage between ground and heated seat relay module harness connector terminal "D" (Orange wire). (Scheme 5) If reading is 10-15 volts, go to next step. If reading is not 10-15 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 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 28.
3. Disconnect heated seat switch connector. Turn ignition switch to RUN position. Check voltage between ground and Brown wire terminal of heated seat switch harness connector. If reading is 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 29.
4. Check voltage between Brown and Black wire terminals of heated seat switch harness connector. If reading is 10-15 volts, go to next step. If reading is not 10-15 volts, go to step 28.
5. Turn ignition switch to OFF position. Using DVOM, check resistance of Pink or Pink/Black wire 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 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 31.
7. Put heated seat switch in LO position. For driver's seat, check resistance between Brown and Light Blue wire terminals of heated seat switch harness connector. For passenger's seat, check resistance between Brown wire and Light Blue/Black wire terminals of heated seat switch harness connector. On all applications, if resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, go to step 32.
8. Ensure heated seat switch is in LO position. For driver's seat, check resistance between Brown and Pink wire terminals of heated seat switch harness connector. For passenger's seat, check resistance between Brown wire and Pink/Black wire terminals of heated seat switch harness connector. On all applications, if resistance is approximately 200 ohms, go to next step. If resistance is not approximately 200 ohms, go to step 32.
9. Put heated seat switch in HI position. For driver's seat, check resistance between Brown and Pink wire terminals of heated seat switch harness connector. For passenger's seat, check resistance between Brown and Pink/Black wire terminals of heated seat switch harness connector. On all applications, if resistance is approximately 310 ohms, go to next step. If resistance is not approximately 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 ground and heated seat relay module harness connector terminal "A" (Red/White wire). 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 component-side of seat cushion connector C1 terminals "A" (Red/White wire) and "B" (Brown wire). If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 35.
13. Check resistance of Brown wire between seat cushion harness connector C1 terminal "B" and seat cushion harness connector C2 terminal "A". If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 36.
14. Check resistance between ground and seat cushion harness connector C1 terminal "B" (Brown wire). If resistance is less than 5 ohms, go to step 37. If resistance is 5 ohms or more, go to next step.
15. Check resistance between component-side of seat cushion connector C2 terminals "A" (Brown wire) and "B" (Black wire). If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 35.
16. Disconnect Light Green seatback 2-pin connectors C3 and C4. Seatback connector C3 has 2 Red/White wires. Seatback connector C4 has 2 Brown wires. 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 5 ohms or more, go to step 36.
17. Check resistance of Brown wire between component-side of seatback connector C3 terminals "A" and "B". If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 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 5 ohms or more, go to step 36.
19. Check resistance between ground and seatback harness connector C3 terminal "B" (Brown wire). If resistance is less than 5 ohms, go to step 37. If resistance is 5 ohms or more, go to next step.
20. Check resistance between component-side of seatback connector C4 terminals "A" (Brown wire) and "B" (Black wire). If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step 38.
21. Check resistance between ground and seatback harness connector C4 terminal "B" (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, 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 5 ohms or more, go to step 39.
23. Check resistance between ground and heated seat relay module harness connector terminal "E" (Yellow/Black wire). If resistance is less than 5 ohms, go to step 40. If resistance is 5 ohms or more, go to next step.
24. With seat cushion at room temperature, check resistance between component-side of seat cushion connector C1 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 ground and seat cushion harness connector C1 terminal "D" (Black wire). If resistance is less than 5 ohms, go to step 28. If resistance is 5 ohms or more, go to next step.
26. Replace heated seat relay module. See «HEATED SEAT COILS & RELAY»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
27. Repair open in Orange wire between heated seat relay module and trunk compartment fuse block. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
28. Check for open in Black wire between heated seat switch, heated seat relay module, heated seatback, heated seat cushion and ground connection G302. Ground connection G302 is located under left front seat. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). Repair as necessary.
29. Repair open in Brown wire between heated seat switch and splice S312. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
30. Repair open in Pink or Pink/Black wire between heated seat relay module and heated seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
31. Repair open in Light Blue or Light Blue/Black wire between heated seat relay module and heated seat switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
32. Replace heated seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
33. Repair open in Red/White wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
34. Repair short to ground in Red/White wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
35. Replace seat cushion. See «SEATBACK & SEAT CUSHION COVERS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
36. Repair open in appropriate Brown wire. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
37. Repair short to ground in appropriate Brown wire. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
38. Replace heated seatback cover. See «SEATBACK & SEAT CUSHION COVERS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
39. Repair open in Yellow/Black wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
40. Repair short to ground in Yellow/Black wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).

TEST 10: SEAT HEAT DOES NOT TURN OFF

Note. After repairs, perform heated seats system check. See SYSTEM CHECKS under TROUBLE SHOOTING.

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 Black 6-pin connector. Heated seat relay module is located under respective seat. If seat cools down, go to step 9 . If seat remains hot, go to next step.
3. If only seatback remains hot, go to step 7 . If seat cushion and seatback both remain hot, go to next step.
4. Disconnect Black 4-pin seat cushion connector C1. Using DVOM, check voltage between ground and heated seat relay module harness connector C1 terminal "A" (Red/White wire). If reading is approximately zero volts, perform heated seats system check. See «SYSTEM CHECKS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__system-checks) under TROUBLE SHOOTING. If reading is not approximately zero volts, go to next step.
5. Replace heated seat switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
6. Repair short to voltage in Red/White wire between heated seat relay module and seat cushion. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) .
7. On DeVille, disconnect Light Green 2-pin seatback connector C2 (one Red/White wire and one Black wire). On Eldorado, disconnect Light Green 2-pin seatback connector C3 (two Red/White wires). On all models, using DVOM check voltage between ground and harness side of seatback connector terminal "A" (Brown wire). If reading is approximately zero volts, perform heated seats system check. See «SYSTEM CHECKS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__system-checks) under TROUBLE SHOOTING. If reading is not approximately zero volts, go to next step.
8. Repair short to voltage in Brown wire between seat cushion and seatback. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams) .
9. Replace heated seat relay module. See «HEATED SEAT COILS & RELAY»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.

TEST 11: ALL LUMBAR FUNCTIONS INOPERATIVE

Note. This diagnostic procedure is for vehicles with lumbar support in both front seats. After repairs, perform lumbar support system check. See SYSTEM CHECKS under TROUBLE SHOOTING. For vehicles with memory seat functions, see appropriate wiring diagram in MEMORY SYSTEMS article.

1. Using test light connected to ground, backprobe lumbar switch connector terminal "E" (Orange wire). (Scheme 6) If test light comes on, go to next step. If test light does not come on, go to step 5.
2. Check for open in Red wire between splice S311 and splice 352. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). 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 splice S313 and splice 351. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). If circuit is okay, go to next step. If circuit is not okay, go to step 6.
4. Replace lumbar switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
5. Repair open in Orange wire between lumbar switch connector terminal "E" and splice S330. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
6. Repair suspect wiring as necessary.

Scheme 6

TEST 12: LUMBAR DOES NOT MOVE UP OR DOWN

Note. This diagnostic procedure is for vehicles with lumbar support in both front seats. After repairs, perform lumbar support system check. See SYSTEM CHECKS under TROUBLE SHOOTING. For vehicles with memory seat functions, see appropriate wiring diagram in MEMORY SYSTEMS article.

1. Using test light connected to ground, backprobe inoperative up/down lumbar relay Black 6-pin connector terminal "C" (Red wire). (Scheme 7) Up/down lumbar relay is located under respective seat. If test light comes on, go to next step. If test light does not come on, 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 comes on, go to next step. If test light does not come on, go to step 11.
3. Press lumbar switch up. Using test light, backprobe between ground and up/down lumbar relay connector terminal "A" (Red wire). If test light comes on, go to next step. If test light does not come on, go to step 12.
4. Press lumbar switch down. Using test light, backprobe between ground and up/down lumbar relay connector terminal "F" (Yellow wire). If test light comes on, go to next step. If test light does not come on, go to step 13.
5. Press lumbar switch up. Using test light, backprobe between ground and up/down lumbar relay connector terminal "B" (Tan wire on driver's seat or Pink wire on passenger's seat). If test light comes on, go to next step. If test light does not come on, go to step 15.
6. Press lumbar switch down. Using test light, backprobe between ground and up/down lumbar relay connector terminal "E" (Purple wire on driver's seat or Orange wire on passenger's seat). If test light comes on, go to next step. If test light does not come on, go to step 15.
7. Check for open or short to ground between up/down lumbar relay connector terminal "B" and up/down lumbar motor connector terminal "A" (Tan wire on driver's seat or Pink wire on passenger's seat). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). 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 between up/down lumbar relay connector terminal "E" and up/down lumbar motor connector terminal "B" (Purple wire driver's seat or Orange wire on passenger's seat). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). 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/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
10. Repair open or short to ground in Red wire between up/down lumbar relay and splice S352 or S356. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
11. Repair open in Black wire between up/down lumbar relay and splice S351 or S357. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
12. Check for open or short to ground in Red wire between up/down lumbar relay connector terminal "A" and lumbar switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). If circuit is okay, go to step 14. 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 connector terminal "F" and lumbar switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). 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/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
15. Replace up/down lumbar relay.
16. Repair open or short to ground in appropriate wire.

Scheme 7

TEST 13: LUMBAR DOES NOT MOVE IN OR OUT

Note. This diagnostic procedure is for vehicles with lumbar support in both front seats. After repairs, perform lumbar support system check. See SYSTEM CHECKS under TROUBLE SHOOTING. For vehicles with memory seat functions, see appropriate wiring diagram in MEMORY SYSTEMS article.

1. Using test light connected to ground, backprobe inoperative in/out lumbar relay Black 6-pin connector terminal "C" (Red wire). (Scheme 7) In/out lumbar relay is located under respective seat. If test light comes on, go to next step. If test light does not come on, 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 comes on, go to next step. If test light does not come on, go to step 11.
3. Press lumbar switch in. Using test light, backprobe between ground and in/out lumbar relay connector terminal "A" (Gray wire). If test light comes on, go to next step. If test light does not come on, go to step 12.
4. Press lumbar switch out. Using test light, backprobe between ground and in/out lumbar relay connector terminal "F" (Purple wire). If test light comes on, go to next step. If test light does not come on, go to step 13.
5. Press lumbar switch in. Using test light, backprobe between ground and in/out lumbar relay connector terminal "B" (Pink wire on driver's seat or White wire on passenger's seat). If test light comes on, go to next step. If test light does not come on, replace in/out lumbar relay.
6. Press lumbar switch out. Using test light, backprobe between ground and in/out lumbar relay connector terminal "E" (Dark Blue wire). If test light comes on, go to next step. If test light does not come on, replace in/out lumbar relay.
7. Check for open or short to ground between in/out lumbar relay connector terminal "B" and in/out lumbar motor connector terminal "A" (Pink wire on driver's seat or White wire on passenger's seat). If circuit is okay, go to next step. If circuit is not okay, go to step 15.
8. Check for open or short to ground in Dark Blue or Dark Blue/White wire between in/out lumbar relay connector terminal "E" and in/out lumbar motor connector terminal "B". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). If circuit is okay, go to next step. If circuit is not okay, go to step 15.
9. Replace in/out lumbar motor. See «SEAT MOTORS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-motors) under REMOVAL & INSTALLATION.
10. Repair open or short to ground in Red wire between in/out lumbar relay connector terminal "C" and splice S352 or S356. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
11. Repair open in Black wire between in/out lumbar relay and splice S351 or S357. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).
12. Check for open or short to ground in Gray wire between in/out lumbar relay connector terminal "A" and lumbar switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). If circuit is okay, go to next step. If circuit is not okay, go to step 15.
13. Check for open or short to ground in Purple wire between in/out lumbar relay connector terminal "F" and lumbar switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams). If circuit is okay, go to next step. If circuit is not okay, go to step 15.
14. Replace lumbar switch. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) under REMOVAL & INSTALLATION.
15. Repair open or short to ground in appropriate wire. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__wiring-diagrams).

REMOVAL & INSTALLATION

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. To install, reverse removal procedure. Tighten seat anchor bolts to 22 ft. lbs. (30 N.m). Check operation of seat, and adjust if necessary. See «ADJUSTMENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) .

POWER LUMBAR ASSEMBLY

Note. Removal and installation procedures for power lumbar motors is not available from manufacturer.

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 8) To install, reverse removal procedure.

Scheme 8

Removal & Installation (Power Seat/Recline Switches - DeVille)

Remove inside door handle bezel from trim panel. Disconnect electrical connectors. Remove seat switches. To install, reverse removal procedure.

Removal & Installation (Lumbar & Heated Seat Switches - DeVille)

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

Removal & Installation (Power Seat/Recline Switches - Eldorado)

Pull switch knobs from switch. Remove screws and seat side trim panel. Disconnect electrical connectors. Remove screw retaining seat switch-to-seat side trim panel. Release 2 retainers for switch assembly. Remove switch assembly. To install, reverse removal procedure.

Removal & Installation (Lumbar Switches - Eldorado)

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

Removal & Installation (Heated Seat Switches - Eldorado)

Block wheels of vehicle. Place shifter in Neutral. Remove shift handle retaining clip. Remove shift handle. Using flat-bladed tool, carefully disengage retaining clips for console trim plate. Lift console trim plate to access electrical connectors. Disconnect electrical connectors. Remove console trim plate. Remove fasteners retaining heated seat switches to console trim plate. Remove heated seat switches. To install, reverse removal procedure.

1. Remove power seat. See «POWER SEAT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) . Place seat upside-down on a clean surface. Remove seat side trim and power seat switches. See «POWER SWITCHES»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) . Disconnect seat cushion "J" retainers to access fasteners and electrical connectors. Remove seat belt buckle. Remove 2 rear hog rings from seat skirt.
2. Remove seatback. See «SEATBACK ASSEMBLY»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) . Remove seat cushion cover and foam. Disconnect electrical connectors. Remove seat adjuster assembly. To install, reverse removal procedure. Ensure seat adjusters are in phase. See «SEAT ADJUSTER PHASING»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system__seat-adjuster-phasing) under ADJUSTMENTS.

SEAT MOTORS

Note. Removal and installation procedures for individual power lumbar motors is not available from manufacturer.

Removal & Installation (Seat Adjuster Motors)

1. Move seat to full up position. Remove power seat. See «POWER SEAT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system). 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 9) To install, reverse removal procedure.

Scheme 9

Removal & Installation (Power Recliner Motors)

1. Move seat to full up position. Remove power seat. See «POWER SEAT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-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. Disconnect electrical connector from recliner motor. Remove recliner motor from seat assembly. To install, reverse removal procedure.

1. Remove seatback cover. See «SEATBACK & SEAT CUSHION COVERS»(/cadillac/deville-concours/i-final-1999-1999/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 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)

1. Remove front seat. See «POWER SEAT»(/cadillac/deville-concours/i-final-1999-1999/remont/seats/#power-seat-system) . 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. Release "J" retainer at bottom of seatback.
2. As necessary, remove lower hog rings securing seatback cover to seat frame. Using Head Restraint Lock Releaser (J-39509), remove head restraint. Remove seat cover with cushion up off of seatback frame. To install, reverse removal procedure.

Removal & Installation (Seat Cushion Cover)

Remove front seat. See POWER SEAT . 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 9) To install, reverse removal procedure.

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

WIRING DIAGRAMS

Note. For memory seat wiring diagrams, see MEMORY SYSTEMS article.

Power Seats Wiring Diagram (DeVille). Scheme 10

Power Seats Wiring Diagram (Eldorado). Scheme 11

Power Heated Seats Wiring Diagram (DeVille). Scheme 12

Power Heated Seats Wiring Diagram (Eldorado). Scheme 13

Power Lumbar Seats Wiring Diagram W/Massage (DeVille & Eldorado). Scheme 14

Power Lumbar Seats Wiring Diagram W/Massage W/O Massage (DeVille & Eldorado). Scheme 15

See also:
• COMPUTER RELEARN PROCEDURES
• WIRING DIAGRAMS
• SYSTEM CHECKS
• PRELIMINARY INSPECTION
• SYMPTOM INDEX
• TEST 9: SEAT DOES NOT HEAT
• TEST 10: SEAT HEAT DOES NOT TURN OFF
• TEST 12: LUMBAR DOES NOT MOVE UP OR DOWN
• TEST 11: ALL LUMBAR FUNCTIONS INOPERATIVE
• TEST 13: LUMBAR DOES NOT MOVE IN OR OUT
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 10
• SEAT MOTORS
• SEAT ADJUSTER PHASING