For 1990-2009 cars

## Lumbar Support Inoperative Buick

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire Buick Lumbar Support System Check performed? | -- | Go to Step 2 | Go to Lumbar Support System Check
2 | Backprobe the lumbar switch connector with a test lamp from cavity A (ORN) to ground. Does the test lamp light? | -- | Go to Step 3 | Go to Step 7
3 |

1. Backprobe the lumbar switch connector with a test lamp from cavity A (ORN) to cavity C (BLK).
2. Backprobe the lumbar switch connector with a test lamp from cavity A (ORN) to cavity F (BLK).

Does the test lamp light for both ground cavities?

--

Go to Step 4

Go to Step 8

4 |

1. Backprobe the lumbar motor connector with a test lamp from cavity A (DK BLU) to ground.
2. Place the lumbar switch in the OUT position.

Does the test lamp light?

--

Go to Step 5

Go to Step 9

5 |

1. Backprobe the lumbar motor connector with a test lamp from cavity B (PNK) (LH) or cavity B (PPL) (RH) to ground.
2. Place the lumbar switch in the IN position.

Does the test lamp light?

--

Go to Step 6

Go to Step 10

6 | Replace the lumbar motor. Refer to Front Seat Lumbar Support Replacement . Is the lumbar motor replacement complete? | -- | Go to Lumbar Support System Check | --
7 | Repair the open in CKT 1340 (ORN) between S306 (LH) or S307 (RH) and the lumbar switch. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Lumbar Support System Check | --
8 | Repair the open in CKT 150 (BLK) between S304 (LH) or S305 (RH) and the lumbar switch. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Lumbar Support System Check | --
9 | Inspect CKT 611 (DK BLU) (LH) or CKT 211 (BRN) (RH) for an open between the lumbar switch and the lumbar motor. Refer to Testing for Continuity in Wiring Systems. Is CKT 611 or CKT 211 OK? | -- | Go to Step 11 | Go to Step 12
10 | Inspect CKT 610 (PNK) (LH) or CKT 210 (PPL) (RH) for an open between the lumbar switch and the lumbar motor. Refer to Testing for Continuity in Wiring Systems. Is CKT 610 or CKT 210 OK? | -- | Go to Step 11 | Go to Step 12
11 | Replace the lumbar switch. Is the lumbar switch replacement complete? | -- | Go to Lumbar Support System Check | --
12 | Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Lumbar Support System Check | --

## Lumbar Support Inoperative Oldsmobile

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire Oldsmobile Lumbar Support System Check performed? | -- | Go to Step 2 | Go to Lumbar Support System Check
2 | Backprobe the seat/lock switch connector with a test lamp from cavity B (ORN) to ground. Does the test lamp light? | -- | Go to Step 3 | Go to Step 9
3 | Backprobe the seat/lock switch connector with a test lamp from cavity B (ORN) to cavity D (BLK). Does the test lamp light? | -- | Go to Step 4 | Go to Step 10
4 |

1. Disconnect the lumbar seat module connector C1.
2. Connect a DMM from the lumbar seat module connector C1 cavity A (ORN) to ground.

Is the voltage within the specified range?

10-15 V

Go to Step 5

Go to Step 11

5 |

1. Disconnect the lumbar seat module connector C2.
2. Connect a DMM from the lumbar seat module connector C1 cavity A (ORN) to connector C2 cavity D (BLK).

Is the voltage within the specified range?

10-15 V

Go to Step 6

Go to Step 12

6 |

1. Connect a DMM from the lumbar seat module connector C2 cavity A (RED) to cavity C (YEL) (LH) or connector C1 cavity E (RED) to connector C2 cavity B (YEL) (RH).
2. Operate the upper lumbar to inflate and deflate.
3. Connect a DMM from the lumbar seat module connector C1 cavity B (GRY) to cavity D (PPL) (LH) or connector C1 cavity C (GRY) to cavity F (PPL) (RH).
4. Operate the lower lumbar to inflate and deflate.

Is the voltage (ignore polarity) within the specified range for each switch operation?

10-15 V

Go to Step 8

Go to Step 7

7 | Replace the lumbar seat module. Is the lumbar seat module replacement complete? | -- | Go to Lumbar Support System Check | --
8 | Replace the suspect seat/lock switch. Is the seat/lock switch replacement complete? | -- | Go to Lumbar Support System Check | --
9 | Repair the open in CKT 40 (ORN) between S211 and the seat/lock switch. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Lumbar Support System Check | --
10 | Repair the open in CKT 151 (BLK/WHT) between S212 and the seat/lock switch. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Lumbar Support System Check | --
11 | Repair the open in CKT 1340 (ORN) between S339 and the lumbar seat module. witch. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Lumbar Support System Check | --
12 | Repair the open in CKT 150 (BLK) between S310 and the lumbar seat module. witch. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Lumbar Support System Check | --

## Lumbar Support Inoperative Oldsmobile

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 | Test for an open or disconnected air line at the air pump, solenoid valves, or in the tubing between the air pump and solenoid valves. Are the air lines OK? | -- | Go to Step 5 | Go to Step 3
3 | Repair the suspect air line? Is the air line repair complete? | -- | Go to Lumbar Support System Check | --
4 | Replace the lumbar seat module. Is the lumbar seat module replacement complete? | -- | Go to Lumbar Support System Check | --
5 | Test the associated air line for leaks between the solenoid valve and bladder. Are the air lines OK? | -- | Go to Step 6 | Go to Step 3
6 | Test the lumbar bladder for leaks Is the bladder OK? | -- | Go to Step 4 | Go to Step 7
7 | Replace the suspect lumbar bladder. Is the lumbar bladder replacement complete? | -- | Go to Lumbar Support System Check | --