GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Eighty Eight 🢒 Body and Accessories 🢒 Seats 🢒 Lumbar Support Inoperative

Lumbar Support Inoperative Oldsmobile w/ AL2 LH

Step

Action

Value(s)

Yes

No

1

Did you perform the entire Lumbar Support System Check?

--

Go to Step 2

Go to Lumbar Support System Check

2

Backprobe connector C312 with a DMM from cavity A (ORN) to ground.

Is the voltage within the specified range?

10-15V

Go to Step 3

Go to Step 4

3

Backprobe connector C312 with a DMM from cavity A (ORN) to cavity B (BLK).

Is the voltage within the specified range?

10-15V

Go to Step 6

Go to Step 5

4

Repair the open in CKT 1340 (ORN) between S227 and C312. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Lumbar Support System Check

--

5

Repair the open in CKT 1250 (BLK) between C312 and S218. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Lumbar Support System Check

--

6
  1. Hold the LH lumbar switch in the INFLATE position.
  2. Backprobe with a DMM from the LH lumbar air pump connector power cavity (RED) to connector C312 cavity B (BLK).

Is the voltage within the specified range?

10-15V

Go to Step 7

Go to Step 8

7

Replace the LH lumbar air pump.

Is the repair complete?

--

Go to Lumbar Support System Check

--

8

Replace the LH lumbar switch.

Is the repair complete?

--

Go to Lumbar Support System Check

--

Lumbar Support Inoperative Oldsmobile w/ AL2 RH

Step

Action

Value(s)

Yes

No

1

Did you perform the entire Lumbar Support System Check?

--

Go to Step 2

Go to Lumbar Support System Check

2

Backprobe connector C313 with a DMM from cavity A (ORN) to ground.

Is the voltage within the specified range?

10-15V

Go to Step 3

Go to Step 4

3

Backprobe connector C313 with a DMM from cavity A (ORN) to cavity B (BLK).

Is the voltage within the specified range?

10-15V

Go to Step 6

Go to Step 5

4

Repair the open in CKT 1340 (ORN) between S227 and C313. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Lumbar Support System Check

--

5

Repair the open in CKT 1450 (BLK) between C313 and S307. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Lumbar Support System Check

--

6
  1. Hold the RH lumbar switch in the INFLATE position.
  2. Backprobe with a DMM from the RH lumbar air pump connector power cavity (RED) to connector C313 cavity B (BLK).

Is the voltage within the specified range?

10-15V

Go to Step 7

Go to Step 8

7

Replace the RH lumbar air pump.

Is the repair complete?

--

Go to Lumbar Support System Check

--

8

Replace the RH lumbar switch.

Is the repair complete?

--

Go to Lumbar Support System Check

--

Lumbar Support Inoperative Pontiac w/ AL7

Step

Action

Value(s)

Yes

No

1

Did you perform the entire Lumbar Support System Check?

--

Go to Step 2

Go to Lumbar Support System Check

2

Backprobe the console seat switch connector C1 with a DMM from cavity C (ORN) to ground.

Is the voltage within the specified range?

10-15V

Go to Step 3

Go to Step 11

3
  1. Disconnect the seat air control module connector.
  2. Connect a DMM from the seat air control module connector cavity F (ORN) to ground.

Is the voltage within the specified range?

10-15V

Go to Step 4

Go to Step 12

4
  1. Connect a DMM from the seat air control module connector cavity F (ORN) to cavity B (BLK).
  2. Connect a DMM from the seat air control module connector cavity F (ORN) to cavity E (BLK).

Is the voltage within the specified range for both ground cavities?

10-15V

Go to Step 5

Go to Step 13

5
  1. Connect a DMM from battery positive voltage (B+) to the seat air control module connector cavity A (BLK).
  2. Move the seat select switch to operate the inoperative seat.

Is the voltage within the specified range with the switch operated?

10-15V

Go to Step 6

Go to Step 14

6
  1. Connect a DMM from the seat air control module connector cavity D (WHT) to ground.
  2. Operate any of the inflate switches.

Is the voltage within the specified range with the switches operated?

10-15V

Go to Step 7

Go to Step 15

7
  1. Connect a DMM from the seat air control module connector cavity H (GRY) to ground.
  2. Operate any of the deflate switches.

Is the voltage within the specified range with the switches operated?

10-15V

Go to Step 8

Go to Step 16

8
  1. Backprobe the seat air pump connector with a DMM from cavity A (TAN) to ground.
  2. Operate any of the inflate switches.

Is the voltage within the specified range with the switches operated?

10-15V

Go to Step 9

Go to Step 18

9
  1. Backprobe the seat air pump connector with a DMM from cavity B (PPL) to ground.
  2. Operate any of the deflate switches.

Is the voltage within the specified range with the switches operated?

--

Go to Step 10

Go to Step 19

10

Replace the seat air pump.

Is the repair complete?

--

Go to Lumbar Support System Check

--

11

Repair the open in CKT 640 (ORN) between S237 and the console seat switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Lumbar Support System Check

--

12

Repair the open in CKT 1340 (ORN) between S227 and the seat air control module. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Lumbar Support System Check

--

13

Repair the open in CKT 1250 (BLK) between the seat air control module and S362. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Lumbar Support System Check

--

14

Test for an open in CKT 769 (BLK) between the console seat switch and the seat air control module. Refer to Testing for Continuity in Wiring Systems.

Is CKT 769 OK?

--

Go to Step 17

Go to Step 21

15

Test for an open or short to ground in CKT 766 (WHT) between the console seat switch and the seat air control module. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems.

Is CKT 766 OK?

--

Go to Step 17

Go to Step 21

16

Test for an open or short to ground in CKT 764 (GRY) between the console seat switch and the seat air control module. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems.

Is CKT 764 OK?

--

Go to Step 17

Go to Step 21

17

Replace the console seat switch.

Is the repair complete?

--

Go to Lumbar Support System Check

--

18

Test for an open or short to ground in CKT 768 (TAN) between the seat air control module and the seat air pump. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems.

Is CKT 768 OK?

--

Go to Step 20

Go to Step 21

19

Test for an open or short to ground in CKT 767 (PPL) between the seat air control module and the seat air pump. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems.

Is CKT 767 OK?

--

Go to Step 20

Go to Step 21

20

Replace the seat air control module.

Is the repair complete?

--

Go to Lumbar Support System Check

--

21

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

Is the repair complete?

--

Go to Lumbar Support System Check

--