Did you perform the Radio/Audio System diagnostic system check?

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Go to Step 2

Go to Diagnostic System Check - Radio/Audio System

1. Turn ON the ignition, with the engine OFF.

Turn ON the radio.

3. Tune the radio to a known strong AM station then to a known strong FM station.

Is the radio reception clear?

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Go to Audio System Troubleshooting Hints

Go to Step 3

Inspect for proper connections at the antenna and 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 4

Does poor or no reception occur only on AM?

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Go to Step 5

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the radio antenna module harness connector.
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 illuminate?

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Go to Step 6

Go to Step 9

1. Turn OFF the ignition.
2. Disconnect the negative battery cable.
3. Remove the radio. Refer to Radio Replacement .

Important: Always zero out the DMM before taking a resistance measurement to ensure an accurate reading.

4. Measure the resistance between the negative battery cable and the radio antenna coaxial ground at the radio.

Does the resistance measure greater than the specified value?

0.40 ohms

Go to Step 10

Go to Step 7

Important: Always zero out the DMM before taking a resistance measurement to ensure an accurate reading.

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?

0.40 ohms

Go to Step 11

Go to Step 8

1. Install the radio. Refer to Radio Replacement for service procedure.
2. Connect the radio antenna module harness connector.
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 repairs.

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 or Antenna Cable Replacement for service procedure.

Did you complete the replacement?

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Go to Step 17

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Replace the radio antenna module. Refer to Radio Antenna Module Replacement for service procedure.

Did you complete the replacement?

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Go to Step 17

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Replace the Radio and perform the set up procedure for the Radio. Refer to Radio Replacement and Radio Setup for service procedure.

Did you complete the replacement?

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Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3