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 adjust the lumbar support up, down, in, and out. Do all of the lumbar support functions operate properly? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are all of the lumbar support functions inoperative? | Go to Step 4 | Go to Step 8 |
4 | Connect a test lamp to a good ground, and back probe the lumbar seat switch positive voltage supply circuit at the harness connector of the lumbar seat switch. Does the test lamp illuminate? | Go to Step 5 | Go to Step 14 |
5 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 13 |
6 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 8 |
7 | Connect a test lamp to a battery voltage supply circuit, and back probe the common ground circuits of the vertical and horizontal relays Does the test lamp illuminate? | Go to Step 19 | Go to Step 16 |
8 |
Does the test lamp illuminate when the switch is pressed in both directions? | Go to Step 12 | Go to Step 9 |
9 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 15 |
10 | Connect the test lamp from the positive voltage supply circuit terminal to the ground circuit terminal in the inoperative lumbar adjuster relay connector. Does the test lamp illuminate? | Go to Step 11 | Go to Step 17 |
11 |
Does the test lamp illuminate? | Go to Step 19 | Go to Step 13 |
12 | Test and repair the inoperative lumbar support motor supply circuits 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 21 | Go to Step 15 |
13 | Test and repair the inoperative lumbar adjuster switch signal 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 21 | Go to Step 18 |
14 | Repair the lumbar adjuster switch positive voltage supply 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 21 | -- |
15 | Repair the open, high resistance, or short to ground in the positive voltage supply circuit to the lumbar adjuster relay. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems. Is the repair complete? | Go to Step 21 | -- |
16 | Repair the open or high resistance in the common ground circuit of the lumbar support circuit. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems. Is the repair complete? | Go to Step 21 | -- |
17 | Repair the open or high resistance in the inoperative lumbar adjuster relay ground circuit. Refer to Circuit Testing and Wiring Repairs or Connector Repairs in Wiring Systems. Is the repair complete? | Go to Step 21 | -- |
18 | Replace the lumbar adjuster switch. Is the repair complete? | Go to Step 21 | -- |
19 | Replace the lumbar adjuster relay. Is the repair complete? | Go to Step 21 | -- |
20 | Replace the lumbar adjuster motor. Refer to Front Seat Lumbar Support Replacement . Is the repair complete? | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
