GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire Oldsmobile Lumbar System Check performed?

--

Go to Step 2

Go to Lumbar Support System Check

2

  1. Disconnect the lumbar seat module connector C1.
  2. Connect a J 39200 digital multimeter (DMM) from the lumbar seat module connector C2 cavity A (RED) (left) or cavity E (RED) (right) to ground.
  3. Operate the lower inflate switch.

Is the voltage within the specified range?

10-15 V

Go to Step 3

Go to Step 5

3

Connect a J 39200 DMM from the lumbar seat module connector C2 cavity C (YEL) (left) or cavity C (YEL) (right) to ground.

Is the voltage within the specified range?

10-15 V

Go to Step 4

Go to Step 6

4

Replace the lumbar seat module.

Is the repair complete?

--

Go to Lumbar Support System Check

--

5

Test CKT 387 (RED) (left) or CKT 756 (RED) (right) for an open between the seat lock switch and the lumbar seat module. Refer to Testing for Continuity in Wiring Systems.

Is CKT 387 or CKT 756 OK?

--

Go to Step 6

Go to Step 8

6

Test CKT 386 (YEL) (left) or CKT 757 (YEL) (right) for an open between the seat lock switch and the lumbar seat module. Refer to Testing for Continuity in Wiring Systems.

Is CKT 386 or CKT 757 OK?

--

Go to Step 7

Go to Step 8

7

Replace the seat/lock switch. Refer to Power Seat Switch Replacement .

Is the repair complete?

--

Go to Lumbar Support System Check

--

8

Repair the suspect circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Lumbar Support System Check

--