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

Attempt to inflate and deflate the upper and lower 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

Is the lumbar pump motor always ON?

Go to Step 8

Go to Step 4

Are all of the lumbar support functions inoperative?

Go to Step 9

Go to Step 5

Press the lumbar INFLATE switch for the inoperative lumbar support function.

Does the lumbar pump motor run?

Go to Step 6

Go to Step 12

Does the lumbar bladder inflate and stay inflated?

Go to Step 7

Go to Step 13

1. Disconnect the lumbar pump/control module assembly.
2. Probe the appropriate lumbar deflate control circuit of the lumbar control module with a test lamp that is connected to a good ground.
3. Press the appropriate lumbar DEFLATE switch.

Does the test lamp Illuminate?

Go to Step 17

Go to Step 14

1. Disconnect the lumbar pump/control module assembly.
2. Probe the upper and lower lumbar inflate control circuits of the lumbar control module with a test lamp that is connected to a good ground.

Does the test lamp Illuminate for either circuit?

Go to Step 18

Go to Step 21

1. Disconnect the lumbar pump/control module assembly.
2. 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

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

1. Probe one of the lumbar control circuits of the lumbar control module with a test lamp that is connected to a good ground.
2. Press the appropriate lumbar switch.

Does the test lamp illuminate?

Go to Step 20

Go to Step 23

1. Disconnect the lumbar pump/control module assembly.
2. Probe the inoperative lumbar function inflate control circuit of the lumbar control module with a test lamp that is connected to a good ground.
3. Press the appropriate lumbar INFLATE switch.

Does the test lamp illuminate?

Go to Step 17

Go to Step 15

1. Disconnect the lumbar pump/control module assembly.
2. Probe the inoperative lumbar function deflate control 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 19

Go to Step 17

Test the deflate control circuit of the inoperative lumbar 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

Test the inflate control circuit of the inoperative lumbar 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

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

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

Test the appropriate lumbar 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

Test the appropriate lumbar 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

Perform a mechanical inspection of the lumbar pump/control module assembly and bladders for air leaks, pinched air lines, and a blocked exhaust port. Refer to Lumbar Bladder Replacement .

Did you find and correct the condition?

Go to Step 28

Go to Step 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

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

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

--

Repair the short to ground or 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

--

Repair the high resistance or 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

--

Replace the lumbar pump/control module assembly. Refer to Lumbar Pump Replacement .

Did you complete the replacement?

Go to Step 28

--

Replace the lumbar switch. Refer to Lumbar Switch Replacement .

Did you complete the replacement?

Go to Step 28

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2