DEFINITION: This table is used to diagnose inoperative steering wheel controls. The steering wheel controls do illuminate when the exterior lamps are on.

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. 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

1. Turn OFF the radio.
2. Turn OFF the ignition.
3. Disable the SIR. Refer to Disabling the SIR System in SIR.
4. Disconnect the steering wheel radio controls connector.
5. Turn ON the ignition, with the engine OFF.
6. Turn ON the radio.
7. Measure the voltage from the radio at terminal B of the harness connector and a good ground.

Does the voltage measure near the specified voltage?

5 V

Go to Step 4

Go to Step 5

1. Measure the resistance between the steering wheel radio controls connector terminal B and terminal D.
2. Press the following steering wheel radio controls and record the resistance values:

•

Volumn Up

•	Volumn Down

•

Mode

•

Select Up

•	Select Down

•

Scan

Do the recorded resistance readings measure near the specified values?

164 ohms

82 ohms

284 ohms

464 ohms

794 ohms

1474 ohms

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

Go to Step  7

1. Turn OFF the ignition.
2. Disconnect the radio connector.
3. Test the input circuit between harness connector terminal B and the radio connector terminal F8 for a short, high resistance or an open. Refer to Testing for Continuity and Testing for Short to Ground in Wiring Systems.

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 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 in Wiring Systems.

Did you find and correct the condition?

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Go to Step  10

Go to Step  8

Replace the steering wheel radio controls.

Did you complete the replacement?

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Go to Step  10

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1. Replace the radio and perform the set-up procedure.
2. Install a scan tool.
3. Select RADIO THEFT from the SPECIAL FUNCTIONS menu.
4. Follow the instructions on the screen.

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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Go to Step  2

System OK