GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform Diagnostic System Check - Cellular Telephone ?

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Go to Step  2

Go to Diagnostic System Check - Cellular Telephone

2

  1. Dock the cellular telephone handset.
  2. Turn ON the ignition.
  3. Turn on the radio and set the radio volume.
  4. Attempt to place a call in hands-free mode.
  5. Attempt to place a call using the docked handset.

Does the system operate normally?

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

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the cellular telephone microphone.
  3. Test the microphone audio circuit for a short to battery positive 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

Test the microphone audio circuit for an open or a 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 5

5

Test the microphone ground circuit 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

6

Inspect the cellular telephone microphone connector for poor connections. 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

7

Replace the cellular telephone microphone.

Did you find and correct the condition?

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Go to Step 10

Go to Step 8

8

Inspect the cellular telephone module connector for poor connections. 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

9

Replace the cellular telephone module. Refer to Radio Frequency Booster and Bracket Assembly Replacement .

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

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