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 - Entertainment System

1. Turn ON the ignition, with the engine OFF.
2. Turn ON the radio.
3. Operate all of the steering wheel controls.

Do all of the steering wheel controls operate properly?

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

Go to Step  3

Caution: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to Disabling the SIR System. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

1. Turn OFF the ignition.
2. Disconnect the steering column in-line connector.
3. Turn ON the ignition, with the engine OFF.
4. Test the RSA/SWC reference power circuit for an open.

Did you find and correct the condition?

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Go to Step  10

Go to Step 4

1. Measure the resistance between the RSA/SWC reference power circuit of the steering column in-line connector and the steering wheel control signal circuit.
2. Press the following steering wheel controls and record the resistance values:

•

Volume Up

•	Volume Down

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Play

•

Mute

•

Seek Up

•

Seek Down

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AM/FM

•

Pre-Set

Do the recorded resistances measure near the specified values?

1270 ohms

1564 ohms

1912 ohms

2387 ohms

3102 ohms

4282 ohms

6652 ohms

13,632 ohms

Go to Step  5

Go to Step  7

1. Turn OFF the ignition.
2. Disconnect the radio connector.
3. Turn ON the ignition, with the engine OFF.
4. Test the RSA/SWC reference power circuit between the steering column in-line connector and the radio connector for a short, high resistance or an open.

Did you find and correct the condition?

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Go to Step  10

Go to Step  6

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  10

Go to Step  9

Inspect for poor connections at the harness connector of the steering wheel radio controls. 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  10

Go to Step  8

Replace the appropriate steering wheel radio control. Refer to Steering Wheel Control Switches Replacement for service procedure.

Did you complete the replacement?

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Go to Step  10

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

Did you complete the replacement?

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Go to Step  10

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Operate the system for which the symptom occurred.

Is the symptom still present?

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System OK

Go to Step  2