Did you perform the Radio/Audio System Check?

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Go to Step 2

Go to Radio/Audio System Check

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

Is the condition present?

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Go to Step  3

Go to Step  4

1. Perform the antenna system test. Refer to Antenna Diagnostic Check .
2. Make any necessary repairs.
3. Test the system again for the condition.

Is the condition still present?

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Go to Step  5

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Contact the customer for an explanation of the faulty condition. Test the system again.

Is the system OK?

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Go to Radio/Audio System Check

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Is the vehicle equipped with aftermarket electronic equipment?

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Go to Step  5

Go to Step  6

Inspect for proper installation of the aftermarket electronic equipment. Refer to Checking Aftermarket Accessories in Wiring Systems.

Were GM aftermarket installation guidelines followed?

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Go to Step  8

Go to Step  9

1. Test the integrity of the ignition system for the following:

•	Proper spark wire routing

•	Ignition misfire

2. Test the integrity of all engine compartment grounds.
3. Test for malfunctions in the following components:

•	The relays

•	The solenoids

•	Other components which may cause reduced reception

Is the system OK?

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Go to Radio/Audio System Check

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Remove the fuses and the circuit breakers one at a time until the faulty circuit has been identified.

Did you identify the faulty circuit?

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Go to Step 10

Go to Step 12

1. Correct the improper installation.
2. Re-test the system for the fault condition

Did you complete the repair?

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Go to Radio/Audio System Check

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1. Mark the fuses of the faulty circuit.
2. Re-install all of the fuses and circuit breakers. Refer to Fuse Block Schematics in Wiring Systems in order to identify all of the systems and the components powered through the marked fuse(s) and/or circuit breaker(s).

Did you identify the appropriate component?

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Go to Step  11

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Inspect the ground integrity of the component. Refer to Testing for Short to Ground in Wiring Systems.

Is the ground of the component OK?

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Go to Radio/Audio System Check

Go to Step 12

Repair the faulty circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Radio/Audio System Check

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