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HOMESERVICE MANUALSCADILLAC1997SEVILLE SLSREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTSEATSPOWER SEAT SYSTEMDIAGNOSIS & TESTINGBASIC SEAT FUNCTIONS (CONCOURS & DEVILLE)ALL POWER SEAT FUNCTIONS INOPERATIVE
1997 Cadillac Seville SLS

All Power Seat Functions Inoperative

1997 Cadillac Seville SLSSECTION 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  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.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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