GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform Diagnostic System Check - Cellular Telephone ?

--

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?

--

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

Go to Step 3

3

  1. Make sure the telephone is on and that the handset is docked.
  2. Turn ON the ignition, with the engine off.
  3. Press and hold the PWR key on the telephone handset.

Does the telephone display illuminate?

--

Go to Step 20

Go to Step 4

4

  1. Press the driver information center (DIC) INFORMATION button.
  2. Select PHONE INFO.

Does the PHN NO HANDSET message appear on the DIC?

--

Go to Step 7

Go to Step 5

5

  1. Turn OFF the ignition.
  2. Disconnect the cellular telephone module connector.
  3. Test the battery positive voltage circuit of the cellular telephone module 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?

--

Go to Step 20

Go to Step 6

6

Test the ground circuit of the cellular telephone module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 7

7

  1. Turn OFF the ignition.
  2. Reconnect the cellular telephone module connector.
  3. Disconnect the cellular telephone handset connector.
  4. Turn ON the ignition, with engine off.
  5. Test the controlled power 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?

--

Go to Step 10

Go to Step 8

8

Test the controlled power 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?

--

Go to Step 20

Go to Step 9

9

Test the regulated power 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?

--

Go to Step 20

Go to Step 10

10

Test the data ground circuit of the cellular telephone module for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 11

11

Test the data ground circuit of the cellular telephone module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 12

12

Test the keypad data 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?

--

Go to Step 20

Go to Step 13

13

Test the keypad data 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?

--

Go to Step 20

Go to Step 14

14

Test the display data 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?

--

Go to Step 20

Go to Step 15

15

Test the display data 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?

--

Go to Step 20

Go to Step 16

16

Inspect the cellular telephone handset 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 conditon?

--

Go to Step 20

Go to Step 17

17

Replace the cellular telephone handset and handset cord.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 18

18

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?

--

Go to Step 20

Go to Step 19

19

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

Did you complete the replacement?

--

Go to Step 20

--

20

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

--