Schematic Reference: Lumbar Support Schematics

DEFINITION: This table assumes that the mechanical systems are clear and free of obstructions.

Did you perform the Power Seat Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

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

Does the test lamp illuminate?

Go to Step 4

Go to Step 12

Connect a test lamp between the ground circuit at the inoperative lumbar switch connector and battery positive voltage.

Did the test lamp illuminate?

Go to Step 5

Go to Step 13

1. Connect the inoperative lumbar switch
2. Disconnect the inoperative lumbar motor.
3. Connect a test lamp between the lumbar in control circuit and a good ground.
4. Operate the lumbar switch to the IN position and observe the test lamp.

Did the test lamp illuminate?

Go to Step 6

Go to Step 8

1. Connect a test lamp between the lumbar out control circuit and a good ground.
2. Operate the lumbar switch to the OUT position and observe the test lamp.

Did the test lamp illuminate?

Go to Step 7

Go to Step 9

1. Connect a test lamp between the lumbar in and out control circuits.
2. Operate the lumbar switch to the IN and OUT positions.

Did the test lamp illuminate in both positions?

Go to Step 11

Go to Step 10

Test the lumbar IN motor control circuit for an open or short to ground . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 10

Test the lumbar OUT control circuit for an open or short to ground . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 10

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 16

Go to Step 15

Inspect for poor connections at the inoperative lumbar motor 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 16

Go to Step 14

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

Did you complete the repair?

Go to Step 16

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Repair the open in the lumbar switch ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

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Replace the inoperative lumbar motor. Refer to Front Seat Adjuster Replacement .

Did you complete the replacement?

Go to Step 16

--

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

Did you complete the replacement?

Go to Step 16

--

Operate the system to verify the repair.

Did you correct the condition?

System OK

Go to Step 2