Schematic Reference: Cellular Telephone Schematics

Did you perform Diagnostic System Check - Cellular Communication ?

Go to Step 2

Go to Diagnostic System Check - Cellular Communication

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

1. Turn the audio system on.
2. Select am/fm radio, tape or CD.
3. Dock the cellular telephone handset.
4. Press the PHONE button on the LH side steering wheel controls. The voice prompt should say READY through the audio system speakers.

Did the voice prompt say READY?

Go to Step 10

Go to Step 4

Test the cellular telephone voice signal circuit for a short to 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 5

Test the cellular telephone voice signal circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

Test the cellular telephone voice low reference signal circuit for a short to 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 7

Test the cellular telephone voice low reference signal circuit for an open. 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

Inspect for poor connections at the harness connector of the cellular telephone module. 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 9

Replace the cellular telephone module. Refer to Cellular Telephone Module Replacement .

Did you complete the replacement?

Go to Step 10

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3