GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference: Steering Wheel Controls Schematics

1

Did you perform the Entertainment System Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Entertainment System

2

  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

3

Do one or more of the steering wheel control switches operate properly?

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Go to Step 8

Go to Step 4

4

  1. Disconnect the steering wheel controls.
  2. Press and hold the steering wheel control Preset switch.
  3. Measure the resistance between the RAP fuse supply voltage circuit and the request signal input circuit.

Is the resistance within the specified range?

8415 ohms-10285 ohms

Go to Step 5

Go to Step 9

5

Test the RAP fuse supply voltage circuit for a short 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 11

Go to Step 6

6

Test the request 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 11

Go to Step 7

7

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 11

Go to Step 10

8

Inspect for poor connections at the harness connector of the steering wheel 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 11

Go to Step 9

9

Replace the steering wheel control switch.

Did you complete the replacement?

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Go to Step 11

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10

Replace the radio. Refer to Radio Replacement .

Did you complete the replacement?

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Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2