Did you perform the Diagnostic System Check - Power Seat Systems?

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Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

1. Measure the voltage from the Lumbar UP control circuit of the lumbar switch to a good ground.
2. Activate the lumbar switch UP.

Does the voltage measure within the specified range?

10-15 V

Go to Step 3

Go to Step 4

1. Measure the voltage from the Lumbar DOWN control circuit of the lumbar switch to a good ground.
2. Activate the lumbar switch DOWN.

Does the voltage measure within the specified range?

10-15 V

Go to Step 6

Go to Step 4

Inspect for poor connections at the harness connector of the lumbar switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 12

Go to Step 5

Replace the lumbar switch. Refer to Lumbar Switch Replacement .

Did you complete the replacement?

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Go to Step 12

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1. Measure the voltage from the Lumbar UP control circuit of the lumbar motor to a good ground.
2. Activate the lumbar switch UP.

Does the voltage measure within the specified range?

10-15 V

Go to Step 7

Go to Step 10

1. Measure the voltage from the Lumbar DOWN control circuit of the lumbar motor to a good ground.
2. Activate the lumbar switch DOWN.

Does the voltage measure within the specified range?

10-15 V

Go to Step 8

Go to Step 11

Inspect for poor connections at the harness connector of the lumbar horizontal motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 12

Go to Step 9

Replace the lumbar horizontal motor. Refer to Front Seat Lumbar Support Replacement .

Did you complete the replacement?

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Go to Step 12

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Repair the open in the Lumbar UP control circuit between the lumbar switch and the lumbar vertical motor. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 12

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Repair the open in the Lumbar DOWN control circuit between the lumbar switch and the lumbar vertical motor. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 12

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2

Did you perform the Diagnostic System Check - Power Seat Systems?

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Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

1. Turn ON the ignition, with the engine OFF.
2. With a scan tool, observe the lumbar Switches parameter in the Memory Seat Module data list.
3. Activate the lumbar switch UP and DOWN.

Does the scan tool indicate that the lumbar switch moves UP and DOWN?

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Go to Step 3

Go to Step 6

1. Disconnect the lumbar vertical motor.
2. Connect a fused jumper from battery positive voltage (B+) to one lumbar vertical motor terminal.
3. Connect a fused jumper from the other lumbar vertical motor terminal to ground.

Did the motor run?

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Go to Step 4

Go to Step 14

1. Disconnect the memory seat module (MSM) connector C1.
2. Disconnect the memory seat module (MSM) connector C2.
3. Measure the resistance from the lumbar UP motor cavity to ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 5

Go to Step 15

Measure the resistance from the lumbar DOWN motor cavity to ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 8

Go to Step 15

1. Disconnect the memory seat module (MSM) connector C2.
2. Measure the voltage from the Lumbar Up control circuit of the memory seat module (MSM) to ground.
3. Activate the lumbar switch UP.

Does the voltage measure less than the specified range?

10-15 V

Go to Step 7

Go to Step 9

1. Measure the voltage from the Lumbar DOWN control circuit of the memory seat module (MSM) to ground.
2. Activate the lumbar switch DOWN.

Does the voltage measure less than the specified range?

10-15 V

Go to Step 8

Go to Step 11

Inspect for poor connections at the harness connector of the memory seat module (MSM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 9

Replace the memory seat module (MSM). Refer to Memory Seat Control Module Replacement .

Did you complete the replacement?

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Go to Step 17

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1. Disconnect the lumbar switch connector.
2. Measure the resistance of the Lumbar UP control circuit between the lumbar switch and the memory seat module (MSM).

Does the resistance measure less than the specified range?

5 ohms

Go to Step 12

Go to Step 16

Measure the resistance of the Lumbar DOWN control circuit between the lumbar switch and the memory seat module (MSM).

Does the resistance measure less than the specified range?

5 ohms

Go to Step 12

Go to Step 16

Inspect for poor connections at the harness connector of the lumbar switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 13

Replace the lumbar switch. Refer to Lumbar Switch Replacement .

Did you complete the replacement?

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Go to Step 17

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Replace the lumbar vertical motor. Refer to Front Seat Lumbar Support Replacement .

Did you complete the replacement?

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Go to Step 17

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Repair the open in the appropriate circuit between the MSM and the lumbar vertical motor. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 17

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Repair the open in the appropriate circuit between the lumbar switch and the MSM. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2