Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step tests the state of one of the two lumbar relay control circuits of the inoperative lumbar adjuster relay. If the test lamp in this step illuminates, the circuit is shorted to voltage or the lumbar switch is stuck in the active position.
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This step tests the state of the second of the two lumbar relay control circuits of the inoperative lumbar adjuster relay. If the test lamp in this step illuminates, the circuit is shorted to voltage or the lumbar switch is stuck in the active position.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Lumbar Support Schematics Connector End View Reference: Power Seat Connector End Views | |||
1 | Did you review the Lumbar Support Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Seats |
2 | Verify that the Lumbar Support Inoperative complaint is present by attempting to operate both of the lumbar motors through their full range of adjustment. Does the lumbar support system operate as described in the system description and operation? | 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 7 |
4 | Connect a test lamp from the battery positive voltage circuit of the seat lumbar switch to a good ground. Does the test lamp illuminate? | Go to Step 5 | Go to Step 20 |
5 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 21 |
6 | Connect a test lamp from the battery positive voltage circuit of the relay connector to the ground circuit of the relay connector. Does the test lamp illuminate? | Go to Step 17 | Go to Step 22 |
Does the test lamp illuminate? | Go to Step 16 | Go to Step 8 | |
8 | With the test lamp still connected to the lumbar relay control circuit, press the appropriate lumbar switch. Does the test lamp illuminate? | Go to Step 9 | Go to Step 15 |
Connect a test lamp from the other lumbar relay control circuit of the inoperative relay to a good ground. Does the test lamp illuminate? | Go to Step 16 | Go to Step 10 | |
10 | With the test lamp still connected to the lumbar relay control circuit, press the appropriate lumbar switch. Does the test lamp illuminate? | Go to Step 11 | Go to Step 15 |
11 | Connect a test lamp from the battery positive voltage circuit of the relay connector to a good ground. Does the test lamp illuminate? | Go to Step 12 | Go to Step 21 |
12 | Connect a test lamp between the battery positive voltage circuit of the lumbar relay connector to the ground circuit of the relay connector. Does the test lamp illuminate? | Go to Step 13 | Go to Step 22 |
13 |
Does the test lamp illuminate when the switch is pressed in both directions? | Go to Step 19 | Go to Step 14 |
14 | Test the lumbar motor control circuits for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 18 |
15 | Test the lumbar relay control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 17 |
16 | Test the lumbar relay control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 17 |
17 | Inspect for poor connections at the harness connector of the seat lumbar switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 23 |
18 | Inspect for poor connections at the harness connector of the lumbar adjuster relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 24 |
19 | Inspect for poor connections at the harness connector of the seat lumbar motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 25 |
20 | Repair the short to ground or open in the battery positive voltage circuit of the seat lumbar switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
21 | Repair the short to ground or open in the battery positive circuit of the lumbar adjuster relays. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
22 | Repair the open in the ground circuit of the lumbar adjuster relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
23 | Replace the seat lumbar switch. Refer to Lumbar Switch Replacement . Did you complete the replacement? | Go to Step 22 | -- |
24 | Replace the lumbar adjuster relay. Refer to Seat Lumbar Relay Replacement . Did you complete the replacement? | Go to Step 26 | -- |
25 | Replace the lumbar motor. Refer to Front Seat Lumbar Support Replacement . Did you complete the replacement. | Go to Step 26 | -- |
26 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
