Schematic Reference: Lumbar Support Schematics

Did you review the Lumbar Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Lumbar Support Description and Operation

Operate the lumbar system.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Disconnect the inoperative lumbar switch.
2. Connect a test lamp between the battery positive voltage circuit at the inoperative lumbar switch harness connector and good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 9

1. Reconnect the lumbar switch.
2. Disconnect the inoperative lumbar pump.
3. Connect a test lamp between the lumbar pump control circuit and a good ground.
4. Operate the lumbar switch.

Did the test lamp illuminate when the lumbar switch was activated?

Go to Step 5

Go to Step 6

1. Disconnect the inoperative lumbar pump.
2. Connect a test lamp between the lumbar pump control circuit and the ground circuit at the lumbar pump connector.
3. Operate the lumbar switch.

Did the test lamp illuminate when the lumbar switch was activated?

Go to Step 8

Go to Step 10

Test the lumbar pump control circuit 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 7

Inspect for poor connections at the inoperative lumbar switch connector. 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

Inspect for poor connections at the inoperative lumbar pump connector. 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

Repair the open or short to ground in the battery positive voltage circuit for the inoperative lumbar switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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Repair the open in the ground circuit for the inoperative lumbar pump. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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Replace the inoperative lumbar switch. Refer to Lumbar Switch Replacement .

Did you complete the replacement?

Go to Step 13

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Replace the inoperative lumbar pump. Refer to Lumbar Pump Replacement .

Did you complete the replacement?

Go to Step 13

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1. Reconnect any disconnected components.
2. Operate the system to verify the repair.

Did you correct the condition?

System OK

Go to Step 2