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 C3 terminal A and ground.
  2. Press and hold the front end of the driver/passenger seat adjuster switch in the DOWN 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 C3 terminal B and ground.
  2. Set and hold the front end of the driver/passenger seat adjuster switch to the UP 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 287 between the driver/passenger seat adjuster switch terminal E and the driver/passenger seat adjuster motor assembly connector C3 terminal A.

Is there a poor connection or an open in circuit 287?

--

Go to Step 4

Go to Step 5

4

Locate repair the poor connection or an open in circuit 287. Refer to Circuit Testing in Wiring Systems.

Has the repair been completed ?

--

Go to Step 12

--

5

Replace the driver/passenger seat adjuster. Refer to Seat Adjuster Motor Replacement - Power .

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 C3 terminals A and B.
  2. Press and hold the front end of the driver/passenger seat adjuster switch to the UP and then in the DOWN positions.

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

--

Go to Step 9

Go to Step 5

7

Inspect for a poor connection or an open in circuit 286 between the driver/passenger seat adjuster switch terminal F and the driver/passenger seat adjuster motor assembly connector C3 terminal B.

Is there a poor connection or an open in circuit 286?

--

Go to Step 8

Go to Step 5

8

Locate repair the poor connection or an open in circuit 286 Refer to Circuit Testing in Wiring Systems.

Has the repair been completed ?

--

Go to Step 12

--

9

Inspect for a poor connection or an open in the driver/passenger seat adjuster motor assembly connector C3 terminals A and B.

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

--

Go to Step 10

Go to Step 11

10

Locate repair the poor connection or an open at the driver/passenger seat adjuster motor connector C3. Refer to Circuit Testing in Wiring Systems.

Has the repair been completed ?

--

Go to Step 12

--

11

Replace the driver/passenger seat adjuster motor assembly. Refer to Seat Adjuster Motor Replacement - Power .

Has the repair been completed ?

--

Go to Step 12

--

12

Verify that the system operates properly .

Does the system operate properly?

--

System OK

Go to Symptoms - Seats