Attempt to duplicate the complaint condition in each ignition switch key position.

Is the complaint condition verified?

--

Go to Step 2

Go to Step 3

1. Acquire any available technical service bulletins.
2. Perform the antenna system test. Refer to Antenna Inoperative - Fixed Mast .
3. Perform any necessary repairs.
4. Retest for the complaint condition.

Is the complaint condition duplicated?

--

Go to Step 4

Go to Audio Preliminary Diagnosis

1. Contact the customer for an explanation of the complaint condition.
2. Retest the system.
3. Perform any necessary repairs.

Is the repair complete?

--

Go to Audio Preliminary Diagnosis

--

Start the engine. Allow the engine to run.

Is the vehicle equipped with aftermarket electronic equipment?

--

Go to Step 5

Go to Step 6

Verify proper installation of the aftermarket electronic equipment. Refer to Checking Aftermarket Accessories .

Were the GM aftermarket installation guidelines followed?

--

Go to Step 7

Go to Step 8

1. Inspect the system for stored Diagnostic Trouble Codes (DTCs).
2. Inspect the integrity of the ignition system, including the following conditions. Refer to Ignition System Description .

•	Proper spark wire routing

•	No misfiring

3. Inspect the integrity of all the engine compartment grounds.
4. Inspect the following components for malfunctions that may cause poor reception:

•

Relays

•

Solenoids

•	Other components

5. If all of the components are OK, refer to the Sound Service Audio Systems Diagnostic Guide.

Is the repair complete?

--

Go to Audio Preliminary Diagnosis

--

Remove the fuses and the circuit breakers, one at a time, until the complaint condition is eliminated.

Is the complaint condition eliminated?

--

Go to Step 9

Go to Step 11

Correct the installation. Retest the system for the complaint condition.

Is the repair complete?

--

Go to Audio Preliminary Diagnosis

--

1. Mark the complaint fuses.
2. Reinstall all of the fuses and the circuit breakers.
3. Refer to Power Distribution Schematics in Wiring Systems in order to identify all the systems and the components powered by the complaint fuse(s) or circuit breaker(s).

Is the complaint-causing component identified?

--

Go to Step 10

Go to Step 11

Inspect the ground integrity of the complaint-causing component. Perform any necessary repairs. If the component is OK, refer to the Sound Service Audio Systems Diagnostic Guide.

Is the repair complete?

--

Go to Audio Preliminary Diagnosis

--

Refer to the Sound Service Audio Systems Diagnostic Guide for further instructions. Perform the repairs as instructed.

Is the repair complete?

--

Go to Audio Preliminary Diagnosis

--