GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Driver Seat Schematics

Connector End View Reference: Power Seat Connector End Views

1

Did you review the description and operation and perform the necessary inspections?

Go to Step 2

Go to Sit-N-Lift Mobility Seat Description and Operation

2

Verify the fault is present.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

  1. Turn the ignition ON.
  2. Open and close the RR sliding door.

Does the instrument panel cluster (IPC) door ajar message operate normally?

Go to Step 4

Go to Door Ajar Indicator Malfunction

4

  1. Disconnect the mobility seat module connector C1.
  2. Using a test lamp connected to a good ground test both of the battery voltage supply circuit terminals in the harness connector.

Does the test lamp illuminate on both circuits?

Go to Step 5

Go to Step 7

5

Using a test lamp connected to battery voltage test both of the ground circuit terminals in the harness connector C1.

Does the test lamp illuminate on both circuits?

Go to Step 6

Go to Step 8

6

  1. Open the RR sliding door.
  2. Disconnect the mobility seat module connector C2.
  3. Using a test lamp connected to battery voltage test the door jamb switch circuit terminal in the harness connector C2.

Does the test lamp illuminate?

Go to Step 10

Go to Step 9

7

Repair the battery voltage supply circuit to the mobility seat module for an open or short to ground. Refer to Circuit Testing and Wiring Repairs .

Is the repair complete?

Go to Step 12

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8

Repair the mobility seat module ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Is the repair complete?

Go to Step 12

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9

Repair the RR sliding door jamb switch circuit to the mobility seat module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Is the repair complete?

Go to Step 12

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10

Inspect for poor connections at the mobility seat module harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 11

11

Replace the mobility seat module. Refer to Sit-N-Lift Control Module Replacement .

Is the repair complete?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3