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 | Go to Symptoms - Seats | ||||||
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 in Wiring Systems | 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 Handle, Knob, Switch, Side Shield Replacement - Front Seat . 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 | ||||||
