GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the radio/audio system operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2

Verify that the radio display is inoperative and that there is no sound from the speakers.

Do the radio display and speakers operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Inspect the RDO BATT fuse 19 for an open.

Is the fuse open?

--

Go to Step 4

Go to Step 5

4

Repair the short the ground in CKT 340 (ORN). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Replace the RDO BATT Fuse 19.

Is the repair complete?

--

Go to Step 14

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5

Using a DMM test for voltage present at the Radio Connector C1, cavity 10.

Is voltage present?

9 - 16V

Go to Step 7

Go to Step 6

6

Repair the open or high resistance in CKT 340 (ORN). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 14

--

7

Inspect the RDO IGN fuse 24 for an open.

Is the fuse open?

--

Go to Step 8

Go to Step 9

8

Repair the short the ground in CKT 1301 (DK GRN). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Replace the RDO IGN Fuse 24.

Is the repair complete?

--

Go to Step 14

--

9

Test CKT 1301 (DK GRN) for an open.

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

--

Go to Step 10

Go to Step 11

10

Repair the open in CKT 1301 (DK GRN). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 14

--

11

Test CKT 1050 (BLK) for an open.

Is there an open in CKT 1050 (BLK)?

--

Go to Step 12

Go to Step 13

12

Repair the open in CKT 1050 (BLK). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 14

--

13

Service the radio. Refer to Radio Replacement .

Is service of the radio complete?

--

Go to Step 14

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14

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3