GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Cellular Telephone System Check performed?

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Go to Step 2

Go to Cellular Telephone System Check

2

If an adapter harness is used between the vehicle prewire harness and the cellular telephone module, make sure that the correct harness is being used.

Are the adapter harness and cellular telephone module part numbers compatible?

--

Go to Step 4

Go to Step 3

3

Install the correct adapter harness

Is the repair complete?

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Go to Step 15

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4

  1. Turn the audio system on.
  2. Select am/fm radio, tape or CD.
  3. Place handset in docking cup.
  4. Press the SELECT button on the LH side steering wheel controls.

Does a beep sound through the audio system speakers?

--

Go to Step 15

Go to Step 5

5

Does the audio system mute?

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Go to Step 10

Go to Step 6

6

Check that the instrument cluster override option C is correct. Refer to the cellular telephone installation manual.

Is the cluster setup correct?

--

Go to Step 8

Go to Step 7

7

Correct the cluster setup programming.

Is the setup complete?

--

Go to Step 15

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8

  1. Using the instrument cluster, enter phone diagnostics and select Phone Inputs.
  2. Scroll to HND FREE PH 101.
  3. Remove the handset from the docking cup.

Did the handset input change status?

--

Go to Step 10

Go to Step 9

9

Check the docking cup for magnetism behind the spring-loaded retainer.

Is the docking cup magnetized?

--

Go to Step 14

Go to Step 13

10

Check CKT 658 (DK BLU) and CKT 659 (LT BLU/BLK) for opens, shorts to ground or shorts to battery positive voltage.

Are the circuits OK?

--

Go to Step 12

Go to Step 11

11

Repair CKT 658 (DK BLU) or CKT 659 (LT BLU/BLK)

Is the circuit repair complete?

--

Go to Step 15

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12

  1. Check the cellular telephone module connector for poor terminal contact.
  2. If OK, replace cellular telephone module. Refer to Radio Frequency Booster and Bracket Assembly Replacement .

Is the replacement complete?

--

Go to Step 15

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13

Replace the docking cup.

Is the replacement complete?

--

Go to Step 15

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14

Replace the cellular telephone handset. Refer to Cellular Telephone Replacement .

Is the replacement complete?

--

Go to Step 15

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15

  1. Make sure any components removed during diagnosis are installed in place and that all connectors are connected.
  2. Repeat the system check. Refer to Cellular Telephone System Check .

Is the system check complete?

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System OK

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