Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Lumbar Support Schematics DEFINITION: One or more of the driver or passenger seat power lumbar functions are inoperative. | |||
1 | Did you review the Lumbar Support System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Seats |
2 | Attempt to operate the driver and passenger seat lumbar and bolster bladders. Do all of the power lumbar bladders inflate and deflate properly? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are all of the driver and passenger seat power lumbar support functions inoperative? | Go to Step 4 | Go to Step 6 |
4 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 7 |
5 | Connect the test lamp from the battery positive supply circuit terminal to the ground circuit of an air cushion control module. Does the test lamp illuminate? | Go to Step 6 | Go to Step 8 |
6 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 9 |
7 | Repair the battery positive voltage supply circuit to the power seat air cushion control module for an open, high resistance or short to ground. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Is the repair complete? | Go to Step 12 | -- |
8 | Repair the power seat air cushion control module ground circuit for an open or high resistance. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Is the repair complete? | Go to Step 12 | -- |
9 | Test and repair the inoperative switch signal circuit for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 10 |
10 | Replace the inoperative lumbar adjuster switch. Refer to Power Seat Switch Replacement . Is the repair complete? | Go to Step 12 | -- |
11 | Replace the power seat cushion air control module. Refer to Lumbar Motor Replacement . Is the repair complete? | Go to Step 12 | -- |
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
