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

1. Inspect the antenna coaxial cable for proper connections at the antenna amplifier.
2. Inspect the radio on signal circuit (RED/WHT wire) connection at the antenna amplifier.

Did you find and correct the condition?

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Go to Step 17

Go to Step 4

Is there poor or no reception only on AM?

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Go to Step 5

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the smaller 2 way connector (C1) from the antenna amplifier.
3. Turn ON the ignition, with the engine OFF.
4. Turn ON the radio.
5. Connect a test lamp between the radio on signal 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 for service procedure.

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?

0.20 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.

1. Turn OFF the ignition.
2. Remove the antenna coaxial cable from the radio and antenna amplifier.
3. Measure the resistance of the antenna cable center conductor between the radio and the antenna amplifier.

Does the resistance measure greater than the specified values?

RG-58/RG-59  Coax: 0.20 ohms

RG-62/RG62M  Coax: 3.5 ohms

Go to Step 11

Go to Step 8

1. Test for continuity between the antenna coaxial cable center conductor and metal case.
2. Test at the opposite end of the antenna cable also.

Did you measure continuity?

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Go to Step 14

Go to Step 12

Test the radio on signal circuit for an open, short to ground or high resistance. Refer to Circuit Testing and Connector 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 amplifier case ground for an open, or high resistance. Refer to Circuit Testing in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 14

1. Test the antenna cable center conductor for an open or high resistance. Refer to Circuit Testing in Wiring Systems.
2. Inspect the antenna coaxial cable interconnects for a poor connection or corrosion. Refer to Testing for Intermittent Conditions and Poor Connections 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 antenna amplifier. Refer to Testing for Intermittent Conditions and Poor Connections 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 in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 16

Replace the antenna cable.

Did you complete the replacement?

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Go to Step 17

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Replace the antenna amplifier.

Did you complete the replacement?

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Go to Step 17

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1. Replace the radio and perform the set up procedure for the radio.
2. Install a scan tool.
3. Select RADIO THEFT from the SPECIAL FUNCTIONS menu.
4. Follow the instructions on the screen.

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 Audio System Troubleshooting Hints