Diagnostic Aids
The lumbar pump and control module are separate units that are attached to each other by a wire harness and a hose. They are serviced as an assembly.
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Driver Seat Schematics or Passenger Seat 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 | |||||||
2 | Attempt to inflate and deflate the seat bolster and lumbar support bladders. 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 | Is the lumbar pump motor always ON? | Go to Step 8 | Go to Step 4 | ||||||
4 | Are all of the lumbar support functions inoperative? | Go to Step 9 | Go to Step 5 | ||||||
5 | Press the INFLATE switch for the inoperative lumbar support or seat bolster function. Does the lumbar pump motor run? | Go to Step 6 | Go to Step 12 | ||||||
6 | Does the inoperative lumbar or seat bolster bladder inflate and stay inflated? | Go to Step 7 | Go to Step 13 | ||||||
7 |
Does the test lamp Illuminate? | Go to Step 17 | Go to Step 14 | ||||||
8 |
Does the test lamp Illuminate for either circuit? | Go to Step 18 | Go to Step 21 | ||||||
9 | Probe the battery positive voltage circuit of the lumbar control module with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 10 | Go to Step 24 | ||||||
10 | Connect a test lamp between the battery positive voltage circuit of the lumbar control module and the ground circuit of the lumbar control module. Does the test lamp illuminate? | Go to Step 11 | Go to Step 25 | ||||||
11 |
Does the test lamp illuminate? | Go to Step 20 | Go to Step 23 | ||||||
12 |
Does the test lamp illuminate? | Go to Step 17 | Go to Step 15 | ||||||
13 |
Does the test lamp illuminate? | Go to Step 19 | Go to Step 17 | ||||||
14 | Test the deflate control circuit of the inoperative lumbar or seat bolster function for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 22 | ||||||
15 | Test the inflate control circuit of the inoperative lumbar or seat bolster function for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 16 | ||||||
16 | Test the battery positive voltage circuit of the lumbar switch for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 22 | ||||||
17 | Test the battery positive voltage circuit of the lumbar pump/control module assembly for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 20 | ||||||
18 | Test the appropriate lumbar or seat bolster inflate control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 22 | ||||||
19 | Test the appropriate lumbar or seat bolster deflate control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 20 | ||||||
20 | Perform a mechanical inspection of the lumbar pump/control module assembly and bladders for the following conditions:
Refer to Lumbar Bladder Replacement . Did you find and correct the condition? | Go to Step 28 | Go to Step 21 | ||||||
21 | Inspect for poor connections at the harness connector of the lumbar pump/control module assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 26 | ||||||
22 | Inspect for poor connections at the harness connector of the lumbar switch. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 27 | ||||||
23 | Repair the open in the battery positive voltage circuit of the lumbar switch. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | -- | ||||||
24 | Repair the short to ground or an open in the battery positive voltage circuit of the lumbar pump/control module assembly. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | -- | ||||||
25 | Repair the high resistance or an open in the ground circuit of the lumbar pump/control module assembly. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | -- | ||||||
26 | Replace the lumbar pump/control module assembly. Refer to Lumbar Pump Replacement . Did you complete the replacement? | Go to Step 28 | -- | ||||||
27 | Replace the lumbar switch. Refer to Lumbar Switch Replacement . Did you complete the replacement? | Go to Step 28 | -- | ||||||
28 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 | ||||||
