GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Inspect fuse EF21.

Is either fuse EF21 open?

--

Go to Step 2

Go to Step 3

2

  1. Inspect for a short circuit to EF21 and repair if necessary.
  2. Replace the fuse.

Is the repair complete?

--

System OK

--

3

  1. Turn the light switch ON.
  2. Remove the ashtray lamp from the socket.
  3. Use a voltmeter to measure battery voltage available at the ashtray lamp socket.

Does the battery voltage match the specified value?

11-14 V

Go to Step 5

Go to Step 4

4

Repair the open circuit between the ashtray lamp socket and fuse EF21.

Is the repair complete?

--

System OK

--

5

  1. Turn the light switch ON.
  2. Using an ohmmeter, measure the ground circuit to the lamp socket.

Does the resistance equal the value specified?

∞ ohms

Go to Step 7

Go to Step 6

6

Repair the open ground circuit between the ashtray lamp socket and ground.

Is the repair complete?

--

System OK

--

7

Replace the ashtray lamp.

Is the repair complete?

--

System OK

--