GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Inspect fuses F2, F23, and EF7.

Is either fuse F2, F23, and EF7 open?

--

Go to Step 2

Go to Step 3

2

  1. Check for a short circuit and repair it, if necessary.
  2. Replace the open fuses.

Is the repair complete?

--

System OK

--

3

  1. Turn the ignition ON.
  2. Use a voltmeter to check battery voltage available at fuses F2, F23, and EF7.

Does the voltmeter indicate the value specified?

11-14 V

Go to Step 5

Go to Step 4

4

Repair the open power supply circuit for the fuse.

Is the repair complete?

--

System OK

--

5

Use a voltmeter to check the battery voltage available at the clock connector terminal 5.

Does the voltmeter indicate the value specified?

11-14 V

Go to Step 7

Go to Step 6

6

Repair the open circuit between the clock connector terminal 5 and the fuse F23.

Is the repair complete?

--

System OK

--

7

Turn the ignition ON.

Is battery voltage available at the clock connector terminal 15?

--

Go to Step 9

Go to Step 8

8

Repair the open circuit between terminal 15 of the clock connector and fuse F2.

Is the repair complete?

--

System OK

--

9

Inspect continuity between terminal 6 of the clock connector and ground.

Does the multimeter indicate the value specified?

0 ohms

Go to Step 10

Go to Step 11

10

Replace the clock.

Is the repair complete?

--

System OK

--

11

Repair the open ground circuit between terminal 6, the clock connector, and ground G202.

Is the repair complete?

--

System OK

--