GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference : Radio/Audio System Schematics

1

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

2

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

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.

Test the accessory voltage circuit for an open, a short to ground, and a short to voltage. 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 4

4

  1. Test the resistance of the steering wheel control switches.
  2. Press the steering wheel control switches to the correct function, one at a time, and compare the measured values to those shown.

Are the measured resistances approximately equal to the specified values?

Volume Up: 1.2K ohms

Volume Down: 1.56K ohms

Seek Up: 3.1K ohms

Program: 10.6K ohms

Go to Step  5

Go to Step  7

5

Test the steering wheel controls signal 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  10

Go to Step  6

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

7

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?

--

Go to Step  10

Go to Step  8

8

Replace the steering wheel radio control. Refer to Steering Wheel Control Switch Assembly Replacement .

Did you complete the replacement?

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Go to Step  10

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9

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

Did you complete the replacement?

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Go to Step  10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step  2