Schematic Reference: Radio/Audio System Schematics

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.
2. Turn ON the radio.
3. Tune the radio to a several local AM stations then to a several local FM stations.

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 antennas 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 14

Go to Step 4

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 antenna enable signal circuit and ground.

Does the test lamp illuminate?

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Go to Step 5

Go to Step 8

1. Tune the radio to the FM band.
2. Measure the voltage from the FM composite signal circuit of the antenna module to a good ground.

Does the voltage measure near the specified value?

8 V

Go to Step 6

Go to Step 9

1. Turn OFF the ignition.
2. Remove the radio.
3. Inspect for proper retention of the antenna cable in the floating retainer. If the antenna cable is not properly attached in the floating retainer, poor or no connection with the radio will result when the radio is installed.

Can the antenna cable be moved back and forth in the floating retainer?

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Go to Step 13

Go to Step 7

Test the antenna cables 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 14

Go to Step 11

Test the antenna enable signal 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 14

Go to Step 10

Test the FM composite signal 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 14

Go to Step 10

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 14

Go to Step 12

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

Did you complete the replacement?

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Go to Step 14

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Replace the radio. Refer to Radio Replacement .

Did you complete the replacement?

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Go to Step 14

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

Did you complete the replacement?

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Go to Step 14

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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