Schematic Reference: Steering Wheel Controls 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. Operate all of the steering wheel control (SWC) switches.

Do all of the steering wheel control switches 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 ignition.
2. Disable the SIR. Refer to Disabling the SIR System in SIR.
3. Disconnect the SWC connector.
4. Measure the resistance from the steering wheel switch input circuit of the SWC and the ground circuit of the SWC.
5. Press the following SWC switches and record the resistance values:

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Volumn Up

•	Volumn Down

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Mode

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Select Up

•	Select Down

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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 Step 4

Go to Step 5

Test the ground circuit between the SWC and the radio 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  10

Go to Step  6

Inspect for poor connections at the harness connector of the SWC. 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  7

Test the steering wheel switch input circuit between the SWC and 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  10

Go to Step  8

Replace the SWC switch.

Did you complete the replacement?

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Go to Step  10

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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

Important:: Perform the set up procedure for the radio.

Replace 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 in order to verify the repair.

Did you correct the condition?

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System OK

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