GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the Radio/Audio Description and perform the necessary inspections?

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Go to Step 2

Go to Diagnostic Starting Point

2

  1. Disconnect the radio.
  2. Place the ignition switch in the RUN position.
  3. Connect a test lamp from CKT 1140 (ORN) cavity 10 at the radio connector C1 to ground.

Does the test lamp illuminate?

--

Go to Step 3

Go to Step 5

3

Connect a test lamp from CKT 1140 (ORN) cavity 10 to CKT 1050 (BLK) cavity 5 at the radio connector C1 to ground.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 6

4

Connect a test lamp from CKT 43 (YEL) cavity 9 at the radio connector C1 to ground.

Does the test lamp illuminate?

--

Go to Step 7

Go to Step 8

5

Repair the open in CKT 1140 (ORN) between the radio and the IP fuse block. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 9

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6

Repair the open in CKT 1050 (BLK) between the radio and GND G200. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 9

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7

  1. Remove the radio. Refer to Radio Replacement .
  2. Send the radio in for repair

Did you complete the replacement?

--

Go to Step 9

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8

Repair the open in CKT 43 (YEL) between the radio and the IP fuse block. Refer to Wiring Repairs in Wiring Systems

Did you complete the repair?

--

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2