GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Using a test light, backprobe between the driver/passenger seat adjuster motor assembly connector C1 terminal A and ground.
  2. Press and hold the driver seat adjuster switch to the FORWARD position.

Does the test light illuminate?

--

Go to Step 2

Go to Step 3

2

  1. Using a test light, backprobe between the driver/passenger seat adjuster motor assembly connector C1 terminal B and ground.
  2. Press and hold the driver/passenger seat adjuster switch to the BACK position.

Does the test light illuminate?

--

Go to Step 6

Go to Step 7

3

Inspect for a poor connection or an open in circuit 285, between the driver/passenger seat adjuster switch terminal H and the driver seat adjuster motor assembly connector C1 terminal A.

Is there a poor connection or an open in circuit 285?

--

Go to Step 4

Go to Step 5

4

Repair the poor connection or an open in circuit 285.

Has the repair been completed ?

--

Go to Step 12

--

5

Replace the driver seat adjuster switch. Go to Power Seat Switch Replacement .

Has the repair been completed ?

--

Go to Step 12

--

6

  1. Using a test light, backprobe between the driver/passenger seat adjuster motor assembly connector C1 terminals A and B.
  2. Press and hold the driver/passenger seat adjuster switch in the FORWARD position and then to the BACK position.

Does the test light illuminate with the switch in both directions?

--

Go to Step 9

Go to Step 5

7

Check for a poor connection or an open in circuit 284 between the driver/passenger seat adjuster switch terminal G and the driver/passenger seat adjuster motor assembly connector C1 terminal B.

Is there a poor connection or an open in circuit 284?

--

Go to Step 8

Go to Step 5

8

Repair the poor connection or an open in circuit 284.

Has the repair been completed ?

--

Go to Step 12

--

9

Check for a poor connection in the driver/passenger seat adjuster motor assembly connector C1 terminals A and B.

Is there a poor connection or an open in either terminal?

--

Go to Step 10

Go to Step 11

10

Repair the poor connection or an open connection the driver/passenger seat adjuster motor connector C1 terminal A or B.

Has the repair been completed ?

--

Go to Step 12

--

11

Replace the driver/passenger seat adjuster motor assembly. Go to Power Seat Switch Replacement .

Has the repair been made and the system rechecked?

--

Go to Step 12

--

12

Verify that the system operates properly .

Does the system operate properly ?

--

System OK

Go to Symptoms - Seats