GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Check the fuse Ef2.

Is fuse Ef2 blown?

--

Go to Step 2

Go to Step 3

2

Replace fuse Ef2.

Is the repair complete?

--

System OK

--

3

  1. Remove the controller.
  2. Measure the voltage between connectors A14.

Is the voltage within the specified value?

11-14 V

Go to Step 4

Go to Step 5

4

  1. Check the controller for damage.
  2. Replace the controller if it is damaged.

Is the repair complete?

--

System OK

--

5

Check the voltage between terminal A1 and ground.

Is this voltage as specified?

0 V

Go to Step 6

Go to Step 7

6

  1. Check the wiring harness between fuse F19 and the terminal A14 for damage.
  2. Replace the wiring harness if it is damaged.

Is the repair complete?

--

System OK

--

7

  1. Check the wiring harness between terminal A14 and ground G203 for damage.
  2. Repair the wiring harness, or ground connection as required.

Is the repair complete?

--

System OK

--