Did you review the audio descriptions and operations and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

Do all of the radio functions operate correctly from the radio?

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Go to Step 3

Go to Symptoms

Do all of the heater and A/C functions operate correctly from the heater and A/C control?

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Go to Step 4

Go to Diagnostic System Check in HVAC-Automatic

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 5

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 steering wheel control B+ input circuit for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 12

Go to Step 6

1. Measure the resistance between the ignition positive voltage circuit of the steering column in-line connector and the steering wheel control signal circuit.
2. Depress the following steering wheel controls and record the resistance values:

•

Volumn Up

•	Volumn Down

•

Source

•

Mute

•

Seek Up

•

Seek Down

•

Scan

•

AM/FM

Does the recorded resistances measure near the specified value?

Go to Step 7

Go to Step 9

1. Turn OFF the ignition.
2. Remove the radio. Refer to Radio Replacement .
3. Test the steering wheel control signal input circuit for a short, high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 12

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 12

Go to Step 10

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 12

Go to Step 11

Replace the radio. Refer to Radio Replacement .

Did you complete the replacement?

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Go to Step 12

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Replace the appropriate steering wheel radio control. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel Column - Tilt.

Did you complete the replacement?

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Go to Step 12

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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