GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the 20A AUX PWR/CIG fuse for an open.

Is fuse open?

--

Go to Step 2

Go to Step 3

2

  1. Remove auxiliary power outlet.
  2. Test terminal A for continuity to ground.

Is ground present?

--

Go to Step 4

--

3

  1. Reinstall fuse.
  2. Test terminal A for positive battery voltage.

Is battery voltage present?

--

Go to Step 5

Go to Step 7

4

Repair short to ground in CKT 40.

Is repair complete?

--

System OK

--

5

Test terminal C for continuity to ground.

Is ground present?

--

Go to Step 6

Go to Step 8

6

Replace auxiliary outlet.

Is repair complete?

--

System OK

--

7

Repair open in CKT 40.

Is repair complete?

--

System OK

--

8

Repair open in CKT 150.

Is repair complete?

--

System OK

--