Lumbar Support Inoperative w/o A45
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Connector End Views DEFINITION: One or more of the 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 | Verify that the Lumbar Support Inoperative complaint is present, by attempting to operate the lumbar support motor through it's 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 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 9 |
4 | Connect a test lamp between the battery positive voltage circuit of the switch connector and the ground circuit of the switch connector. Does the test lamp illuminate? | Go to Step 5 | Go to Step 10 |
5 |
Does the test lamp illuminate in both directions? | Go to Step 7 | Go to Step 6 |
6 | Test the 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 13 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the 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 13 | Go to Step 12 |
8 | Inspect for poor connections at the harness connector of the 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 13 | Go to Step 11 |
9 | Repair the open in the battery positive voltage circuit of the lumbar switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
10 | Repair the open in the ground circuit of the lumbar switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the lumbar switch. Refer to Lumbar Switch Replacement . Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the lumbar motor Refer to Front Seat Lumbar Support Replacement . Did you complete the replacement? | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Lumbar Support Inoperative with A45
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Connector End Views DEFINITION: One or more of the lumbar support functions are inoperative. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the lumbar 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 |
Does the Seat Lumbar Forward parameter change state? | Go to Step 4 | Go to Step 5 |
4 |
Does the Seat Lumbar Rearward parameter change state? | Go to Step 8 | Go to Step 7 |
5 | Probe the battery positive voltage circuit of the lumbar switch with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 6 | Go to Step 14 |
6 |
Does the Seat Lumbar Forward parameter change state? | Go to Step 12 | Go to Step 9 |
Does the Seat Lumbar Rearward parameter change state? | Go to Step 12 | Go to Step 9 | |
8 |
Does the test lamp illuminate in both directions? | Go to Step 11 | Go to Step 10 |
9 | Test the suspect switch signal circuit between the lumbar switch and the memory seat module (MSM) for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 13 |
10 | Test the motor control circuits between the MSM and the inoperative lumbar motor 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 18 | Go to Step 13 |
11 | Inspect for poor connections at the harness connector of the 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 18 | Go to Step 16 |
12 | Inspect for poor connections at the harness connector of the 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 18 | Go to Step 15 |
13 | Inspect for poor connections at the harness connector of the MSM. 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 18 | Go to Step 17 |
14 | Repair the short to ground or open in the battery positive circuit of the lumbar switch. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | -- |
15 | Replace the lumbar switch. Refer to Lumbar Switch Replacement . Did you complete the replacement? | Go to Step 18 | -- |
16 | Replace the lumbar motor. Refer to Front Seat Lumbar Support Replacement . Did you complete the replacement? | Go to Step 18 | -- |
17 | Replace the MSM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 18 | -- |
18 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
