GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Radio/Audio System Check?

--

Go to Step 2

Go to Radio/Audio System Check

2

Inspect the RDO BATT fuse 19 for an open.

Is the fuse open?

--

Go to Step 3

Go to Step 6

3

Test CKT 340 (ORN) for a short to ground.

Is there a short to ground in CKT 340 (ORN)?

--

Go to Step 4

Go to Step 5

4

Repair the short to ground in CKT 340 (ORN).

Is the repair complete?

--

Go to Step 5

--

5

Replace the RDO BATT fuse 19.

Is the replacement complete?

--

Go to Radio/Audio System Check

--

6

Test CKT 340 (ORN) for an open.

Is there an open in CKT 340 (ORN)?

--

Go to Step 7

Go to Step 8

7

Repair the open in CKT 340 (ORN).

Is the repair complete?

--

Go to Radio/Audio System Check

--

8

Inspect the RDO IGN fuse 24 for an open.

Is the fuse open?

--

Go to Step 9

Go to Step 12

9

Test CKT 1301 (DK GRN) for a short to ground.

Is there a short to ground in CKT 1301 (DK GRN)?

--

Go to Step 10

Go to Step 11

10

Repair the short to ground in CKT 1301 (DK GRN).

Is the repair complete?

--

Go to Step 11

--

11

Replace the RDO IGN fuse 24.

Is the replacement complete?

--

Go to Radio/Audio System Check

--

12

Test CKT 1301 (DK GRN) for an open.

Is there an open in CKT 1301 (DK GRN)?

--

Go to Step 13

Go to Step 14

13

Repair the open in CKT 1301 (DK GRN).

Is the repair complete?

--

Go to Radio/Audio System Check

--

14

Test CKT 1050 (BLK) for an open.

Is there an open in CKT 1050 (BLK)?

--

Go to Step 15

Go to Step 16

15

Repair the open in CKT 1050 (BLK).

Is the repair complete?

--

Go to Radio/Audio System Check

--

16

Service the radio. Refer to Radio Replacement .

Is service of the radio complete?

--

Go to Radio/Audio System Check

--