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 | Go to Step 3 |
3 |
Does the test light 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 light illuminate? | Go to Step 5 | Go to Step 10 |
5 |
Does the test light 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 . 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 . 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 motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . 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 . Is the trouble corrected? | Go to Step 13 | -- |
10 | Repair the open in the ground circuit of the lumbar switch. Refer to Wiring Repairs . Is the trouble corrected? | Go to Step 13 | -- |
11 | Replace the lumbar switch. Refer to Front Seat Lumbar Support Replacement . Have you finished the replacement? | Go to Step 13 | -- |
12 | Replace the lumbar motor. Refer to Front Seat Lumbar Support Replacement . Have you finished the replacement? | Go to Step 13 | -- |
13 | Operate the system to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Lumbar Support Inoperative with A45
Diagnostic Aids
The memory seat module (MSM) is also referenced as the driver position module (DPM) for this vehicle.
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 | |
2 |
Does the lumbar system operate as described in the system description and operation? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 | Is the seat lumbar system inoperative in all directions? | Go to Step 4 | Go to Step 7 |
4 |
Does the Lumbar Forward Switch parameter display Active? | Go to Step 14 | Go to Step 5 |
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 light illuminate? | Go to Step 6 | Go to Step 15 |
6 |
Does the test light illuminate? | Go to Step 14 | Go to Step 13 |
7 |
Did the Lumbar Switch parameters display Active for both directions? | Go to Step 9 | Go to Step 8 |
8 |
Does the lumbar switch parameter display Active? | Go to Step 13 | Go to Step 10 |
9 |
Does the test light illuminate in both directions? | Go to Step 12 | Go to Step 11 |
10 | 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 . Did you find and correct the condition? | Go to Step 19 | Go to Step 14 |
11 | 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 . Did you find and correct the condition? | Go to Step 19 | Go to Step 14 |
12 | Inspect for poor connections at the harness connector of the lumbar motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 19 | Go to Step 17 |
13 | Inspect for poor connections at the harness connector of the lumbar motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 19 | Go to Step 16 |
14 | Inspect for poor connections at the harness connector of the MSM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 19 | Go to Step 18 |
15 | Repair the open in the battery positive circuit of the lumbar switch. Refer to Wiring Repairs or Connector Repairs . Did you find and correct the condition? | Go to Step 19 | -- |
16 | Replace the lumbar switch. Refer to Front Seat Lumbar Support Replacement . Have you finished the replacement? | Go to Step 19 | -- |
17 | Replace the inoperative lumbar motor. Refer to Front Seat Lumbar Support Replacement . Have you finished the replacement? | Go to Step 19 | -- |
18 | Replace the MSM. Refer to Control Module References for replacement, setup and programming. Have you finished the replacement? | Go to Step 19 | -- |
19 | Operate the system to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
