Did you review the symptom list?

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Go to Step 2

Go to Symptoms

1. Turn ON the ignition, with the engine OFF.
2. Turn ON the radio.
3. Tune the radio to a known strong AM station, then tune to a known strong FM station.

Is the radio reception clear?

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Go to Audio Preliminary Diagnosis

Go to Step 3

Inspect the antenna and the radio antenna module for improper connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 4

Is reception poor only on AM?

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Go to Step 5

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the harness connector to the radio antenna module.
3. Turn ON the ignition, with the engine OFF.
4. Turn ON the radio.
5. Connect a test lamp between the battery positive voltage circuit and ground.

Does the test lamp light?

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Go to Step 6

Go to Step 9

1. Turn OFF the ignition.
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection
3. Remove the radio. Refer to Radio Replacement .
4. Measure the resistance between the negative battery cable and the radio antenna module case ground.

Does the resistance measure greater than the specified value?

0.050 ohms

Go to Step 10

Go to Step 7

Measure resistance of the antenna cable center conductor between the radio and the radio antenna module.

Does the resistance measure greater than the specified value?

0.050 ohms

Go to Step 11

Go to Step 8

1. Install the radio. Refer to Radio Replacement .
2. Connect the harness connector to the radio antenna module.
3. Disconnect the antenna from the radio antenna module.
4. Turn ON the ignition, with the engine OFF.
5. Tune the radio to a known strong AM station.

Does the AM reception degrade further?

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Go to Step 13

Go to Step 12

Test the battery positive voltage circuit for an open, short to ground or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition.

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Go to Step 17

Go to Step 13

Test the antenna ground circuit for an open, or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 14

Test the antenna center conductor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 14

Inspect for poor connections at the radio antenna module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 15

Inspect for poor connections at the radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 16

Replace the coax cable. Refer to Radio Antenna Cable Extension Cable Replacement .

Is the replacement complete?

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Go to Step 17

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Replace the radio antenna module. Refer to Antenna Amplifier Replacement .

Is the replacement complete?

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Go to Step 17

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Replace the Radio. Refer to Radio Replacement .

Is the replacement complete?

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Go to Step 17

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Operate the system in order to verify the repair.

Is the repair complete?

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Go to Symptoms

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