Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

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 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 module.
2. Inspect both harness connectors at the antenna amplifier module for proper connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

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Go to Step 18

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 antenna amplifier module harness connector C1.
3. Turn ON the ignition, with the engine OFF.
4. Turn ON the radio.
5. Measure the voltage from connector C1 terminal 2 to a good ground.

Does the voltage measure near the specified value?

12 V

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 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. Remove the antenna coaxial cable from the radio and antenna amplifier module.
2. Measure the resistance of the antenna cable center conductor between the radio and the antenna amplifier module.

Does the resistance measure greater than the specified values?

RG-58/RG-59  Coax: 0.20 ohms

RG-62/RG-62M  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 15

Go to Step 12

Test the antenna relay coil voltage circuit for an open, short to ground or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

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Go to Step 18

Go to Step 13

Test the antenna amplifier module case ground for an open or high resistance. Refer to Circuit Testing .

Did you find and correct the condition?

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Go to Step 18

Go to Step 14

Inspect the antenna coaxial cable interconnects for a poor connection or corrosion. Refer to Testing for Intermittent Conditions and Poor Connections .

Did you find and correct the condition?

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Go to Step 18

Go to Step 15

Inspect for poor connections at the antenna amplifier module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

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Go to Step 18

Go to Step 16

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

Did you find and correct the condition?

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Go to Step 18

Go to Step 17

Test for an open or high resistance from the negative battery cable to body ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

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Go to Step 18

Go to Step 11

Replace the antenna coaxial cable.

Did you complete the replacement?

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Go to Step 18

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Replace the antenna amplifier module.

Did you complete the replacement?

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Go to Step 18

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Important:: Perform the setup procedure after replacing the radio. Refer to Radio Programming and Setup .

Replace the radio. Refer to Radio Replacement .

Did you complete the replacement?

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Go to Step 18

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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 2