Lumbar Support Inoperative
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Lumbar Support Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Lumbar Support Schematics
IMPORTANT:
This table assumes that the mechanical systems are clear and free of obstructions.
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| 1 | Did you review the Lumbar Support Description and Operation? | Go to Step 2 | Go to Symptoms - Seats |
| 2 | Operate the Lumbar/Bolster system. Does the system operate normally? |
Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS | Go to Step 3 |
| 3 | Are both the lumbar and the bolster motors inoperative? | Go to Step 4 | Go to Step 6 |
| 4 |
|
Go to Step 5 | Go to Step 10 |
| 5 | Connect a test lamp from the battery voltage supply circuit terminal to the ground circuit terminal in the lumbar/bolster switch harness connector. Does the test lamp illuminate? |
Go to Step 8 | Go to Step 11 |
| 6 |
|
Go to Step 9 | Go to Step 7 |
| 7 | Test the motor control circuits for an open or short to ground. Refer to CIRCUIT TESTING
and WIRING REPAIRS
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 8 |
| 8 | Inspect for poor connections at the lumbar/bolster switch connector. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
and to CONNECTOR REPAIRS
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 13 |
| 9 | Inspect for poor connections at the motor connector. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
and to CONNECTOR REPAIRS
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 12 |
| 10 | Repair the open or short to ground in the battery voltage supply circuit to the lumbar/bolster switch. Refer to WIRING REPAIRS
. Did you complete the repair? |
Go to Step 14 | - |
| 11 | Repair the open in the lumbar/bolster switch ground circuit. Refer to WIRING REPAIRS
. Did you complete the repair? |
Go to Step 14 | - |
| 12 | Replace the inoperative motor. Refer to Lumbar Replacement - Front Seat (Manual) or Lumbar Replacement - Front Seat (Power Lumbar/Bolster) . Did you complete the replacement? |
Go to Step 14 | - |
| 13 | Replace the inoperative lumbar/bolster switch. Refer to Lumbar Switch Replacement . Did you complete the replacement? |
Go to Step 14 | - |
| 14 | Operate the system to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |