GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Park Avenue 🢒 Body and Accessories 🢒 Seats 🢒 Lumbar Support Does Not Move In or Out

Step

Action

Value(s)

Yes

No

DEFINITION: This table diagnoses the lumbar support (option AL2) in the left seat and the right seat. The diagnosis does not include the left seat if the left seat is equipped with the memory function (option A43). For diagnosis of the lumbar support in the left seat equipped with A43, refer to the Lumbar Support Diagnostic System Check.

1

Did you perform the Lumbar Support System Check?

--

Go to Step 2

Go to Lumbar Support System Check

2
  1. Use a test lamp in order to backprobe the lumbar switch connector from the appropriate cavity to ground:
    2. • Left: cavity B (PNK)
    • Right: cavity C (WHT)
  2. Move the lumbar switch to the IN position.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3
  1. Use a test lamp in order to backprobe the lumbar switch connector from the appropriate cavity to ground:
    2. • Left: cavity C (DK BLU)
    • Right: cavity B (DK BLU)
  2. Move the lumbar switch to the OUT position.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

4

Replace the suspect lumbar switch. Refer to Power Seat Switch Replacement .

Is the lumbar switch replacement complete?

--

Go to Step 10

--

5
  1. Use a test lamp in order to backprobe the lumbar horizontal motor connector from the appropriate cavity to ground:
    2. • Left: cavity B (PNK)
    • Right: cavity B (WHT)
  2. Move the appropriate lumbar switch to the IN position.

Does the test lamp light?

--

Go to Step 6

Go to Step 8

6
  1. Use a test lamp in order to backprobe the appropriate lumbar horizontal motor connector from cavity A (DK BLU) to ground.
  2. Move the appropriate lumbar switch to the OUT position.

Does the test lamp light?

--

Go to Step 7

Go to Step 9

7

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

Is the lumbar horizontal motor replacement complete?

--

Go to Step 10

--

8

Repair the open in the appropriate circuit:

    • Left: CKT 610 (PNK)
    • Right: CKT 210 (WHT)

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 10

--

9

Repair the open in the appropriate circuit:

    • Left: CKT 611 (DK BLU)
    • Right: CKT 211 (LT BLU)

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 10

--

10

Perform the Lumbar Support System Check. Refer to Lumbar Support System Check .

Is lumbar support operative?

--

Go to Lumbar Support System Check

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