1998 Chevrolet Lumina BaseFACTORY OEM SERVICE PROCEDURE

Rear Height Inoperative, Front Height Operates Normally

  1. Use test light and backprobe between ground and seat adjuster motor connector C1 terminal "A" (Light Blue wire). Move power seat switch to forward position. If test light comes on, go to next step. If test light does not come on, go to step 3).
  2. Use test light and backprobe between ground and seat adjuster motor connector C1 terminal "B" (Yellow wire). Move power seat switch to back position. If test light comes on, go to step 6). If test light does not come on, go to step 7).
  3. Check for poor connection or open in Light Blue wire between seat adjuster motor and power seat switch. If connection and circuit are okay, go to step 5). If connection and circuit are okay, go to next step.
  4. Repair poor connection or open in Light Blue wire between seat adjuster motor and power seat switch. Recheck system operation.
  5. Replace power seat switch. See POWER SEAT SWITCH  under REMOVAL & INSTALLATION. Recheck system operation.
  6. Use test light and backprobe between ground and seat adjuster motor connector C1 terminals "A" (Light Blue wire) and "B" (Yellow wire). Move power seat switch to forward, then back positions. If test light comes on in both positions, go to step 9). If test light does not come on in both positions, go to step 5).
  7. Check for poor connection or open in Yellow wire between seat adjuster motor and power seat switch. If connection and circuit are okay, go to step 5). If connection and circuit are not okay, go to next step.
  8. Repair poor connection or open in Yellow wire between seat adjuster motor and power seat switch. Recheck system operation.
  9. Check for poor connections at forward/back motor. If connections are okay, go to step 11).
  10. Repair poor connection at forward/back motor. Recheck system operation
  11. Replace forward/back motor. See DRIVE MOTOR  under REMOVAL & INSTALLATION. Recheck system operation.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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