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. Adjust the fade and balance controls to mid range.
4. Insert the tape or CD from the J 39916-A .

Can audio be heard from all speakers?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Is the vehicle equipped with an audio amplifier?

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Go to Step 4

Go to Step 5

Test the battery positive voltage circuit of the audio amplifier for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the radio connector. Refer to Radio Replacement .
3. Test all speaker output circuits of the radio for a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 7

Test the ground circuit of the audio amplifier 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 15

Go to Step 8

Inspect for poor connections at the harness connector of 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 15

Go to Step 9

1. Turn ON the ignition, with the engine OFF.
2. Turn ON the radio.
3. Measure the voltage from the amplifier control circuit of the audio amplifier to a good ground.

Does the voltage measure near the specified value?

12 V

Go to Step 10

Go to Step 11

Important:: Perform the radio setup procedure for the radio.

Replace the radio. Refer to Radio Replacement .

Did you complete the replacement?

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Go to Step 15

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1. Turn OFF the ignition.
2. Disconnect the radio connector. Refer to Radio Replacement .
3. Test all speaker output circuits of the radio for a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 12

Test the amplifier control circuit of the radio for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 7

1. Reconnect the radio connector.
2. Disconnect the audio amplifier connector C2.
3. Using two fused jumpers, connect the left front speaker input circuits from the radio to the left front speaker output circuits from the audio amplifier in order to bypass the amplifier.
4. Turn ON the radio.

Does the speaker operate properly?

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Go to Step 13

Go to Step 7

Inspect for poor connections at the harness connector of the audio amplifier. 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 15

Go to Step 14

Replace the audio amplifier. Refer to Radio Speaker Amplifier Replacement .

Did you complete the replacement?

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Go to Step 15

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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