Lumbar Support Does Not Move Up or Down w/o A45
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Lumbar Support Schematics | |||
1 | Did you review the power seat system operation and perform the necessary inspection? | Go to Step 2 | Go to Symptoms - Seats |
2 | Verify that the Lumbar Support Does Not Move Up or Down complaint is present. 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 | Connect a test lamp from the battery positive voltage (B+) circuit of the lumbar vertical relay to a good ground. Does the test lamp illuminate? | Go to Step 4 | Go to Step 20 |
4 | Connect a test lamp between the battery positive voltage (B+) circuit of the lumbar vertical relay and the ground circuit of the lumbar vertical relay. Does the test lamp illuminate? | Go to Step 5 | Go to Step 21 |
5 | Connect a test lamp from the lumbar up relay control circuit of the lumbar vertical relay to a good ground. Does the test lamp illuminate? | Go to Step 14 | Go to Step 6 |
6 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 10 |
7 | Connect a test lamp from the lumbar down relay control circuit of the relay to a good ground. Does the test lamp illuminate? | Go to Step 15 | Go to Step 8 |
8 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 11 |
9 |
Does the test lamp illuminate in both directions? | Go to Step 12 | Go to Step 16 |
10 | Test the lumbar up relay control circuit between the lumbar vertical relay and the lumbar switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 25 | Go to Step 17 |
11 | Test the lumbar down relay control circuit between the lumbar vertical relay and the lumbar switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 25 | Go to Step 17 |
12 | Test the lumbar motor up control circuit between the lumbar vertical relay and the lumbar vertical motor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 25 | Go to Step 13 |
13 | Test the lumbar motor down control circuit between the lumbar vertical relay and the lumbar vertical motor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 25 | Go to Step 19 |
14 | Test the lumbar up relay control circuit between the lumbar switch and the lumbar vertical relay 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 25 | Go to Step 17 |
15 | Test the lumbar down relay control circuit between the lumbar switch and the lumbar vertical relay 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 25 | Go to Step 17 |
16 | Test the lumbar motor up/down control circuits between the lumbar vertical relay and the lumbar vertical motor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 25 | Go to Step 18 |
17 | 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 25 | Go to Step 22 |
18 | Inspect for poor connections at the harness connector of the lumbar vertical 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 25 | Go to Step 23 |
19 | Inspect for poor connections at the harness connector of the lumbar vertical 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 25 | Go to Step 24 |
20 | Repair the open in the battery positive voltage (B+) circuit of the lumbar vertical relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
21 | Repair the open in the ground circuit of the lumbar vertical relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
22 | Replace the lumbar switch. Refer to Power Seat Switch Replacement . Did you complete the replacement? | Go to Step 25 | -- |
23 | Replace the lumbar vertical relay. Refer to Lumbar Component Replacement - Power . Did you complete the replacement? | Go to Step 25 | -- |
24 | Replace the lumbar vertical motor. Refer to Front Seat Lumbar Support Replacement . Did you complete the replacement? | Go to Step 25 | -- |
25 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Lumbar Support Does Not Move Up or Down with A45
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Lumbar Support Schematics | |||
1 | Did you perform the Diagnostic System Check - Power Seats Systems? | Go to Step 2 | |
2 | Verify that the Lumbar Support Does Not Move Up or Down complaint is present. 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 | Operate the lumbar switch in the UP and DOWN directions. Does the lumbar vertical motor run for approximately 1 second then stop? | Go to Step 13 | Go to Step 4 |
4 |
Does the Lumbar Switches parameter change state? | Go to Step 5 | Go to Step 7 |
5 |
Does the Lumbar Switches parameter change state? | Go to Step 6 | Go to Step 8 |
6 |
Does the test lamp illuminate in both directions? | Go to Step 17 | Go to Step 9 |
7 |
With a scan tool, observe the Lumbar Switches parameter. Does the Lumbar Switches parameter change state? | Go to Step 16 | Go to Step 11 |
8 |
With a scan tool, observe the Lumbar Switches parameter. Does the Lumbar Switches parameter change state? | Go to Step 16 | Go to Step 12 |
9 | Test the driver seat lumbar motor up control circuit between the memory seat module and the lumbar vertical 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 21 | Go to Step 10 |
10 | Test the driver seat lumbar motor down control circuit between the memory seat module and the lumbar vertical 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 21 | Go to Step 15 |
11 | Test the driver seat lumbar up switch signal circuit between the lumbar switch and the memory seat module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 15 |
12 | Test the driver seat lumbar down switch signal circuit between the lumbar switch and the memory seat module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 15 |
13 | Test the memory seat sensor low reference circuit between the memory seat module and the lumbar vertical position sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 14 |
14 | Test the 5 volt reference circuit between the memory seat module and the lumbar vertical position sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 15 |
15 | Inspect for poor connections at the harness connector of the memory seat module. 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 21 | Go to Step 18 |
16 | 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 21 | Go to Step 19 |
17 | Inspect for poor connections at the harness connector of the lumbar vertical motor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 20 |
18 | Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement . Did you complete the replacement? | Go to Step 21 | -- |
19 | Replace the lumbar switch. Refer to Lumbar Switch Replacement . Did you complete the replacement? | Go to Step 21 | -- |
20 | Replace the seat lumbar vertical motor. Refer to Front Seat Lumbar Support Replacement . Did you complete the replacement? | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | |
