Step | Action | Yes | No | ||||
|---|---|---|---|---|---|---|---|
Schematic Reference: Lumbar Support Schematics | |||||||
1 | Did you review the lumbar Support Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Seats | ||||
2 | Attempt to inflate and deflate all of the lumbar support and side bladders. Do all of the lumbar support and side bladders operate properly? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||
3 | Are all of the driver or passenger lumbar support functions inoperative? | Go to Step 4 | Go to Step 6 | ||||
4 | Test and repair the positive voltage supply circuits to the seat adjuster switch and the lumbar pump for the following conditions:
Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 5 | ||||
5 | Test and repair the ground circuit to the lumbar pump assembly for an open or high resistance. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 6 | ||||
6 |
Does the inoperative lumbar support function operate properly? | Go to Step 8 | Go to Step 7 | ||||
7 | Test and repair the inoperative lumbar relay control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 9 | ||||
8 | Replace the seat adjuster switch. Refer to Power Seat Switch Replacement . is the repair complete? | Go to Step 11 | -- | ||||
9 | Inspect and repair or replace the air lines or bladders for any leaking or restrictions. Refer to Lumbar Bladder Replacement . Did you find and correct the condition? | Go to Step 11 | Go to Step 10 | ||||
10 | Replace the lumbar pump. Refer to Lumbar Pump Replacement . Is the repair complete? | Go to Step 11 | -- | ||||
11 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 | ||||
