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. Make sure the telephone is on and that the handset is docked.
2. 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 6

Go to Step 4

Check the telephone volume display on the driver information center (DIC).

Is the phone volume adjusted to more than 5 bars on the display?

Go to Step 6

Go to Step 5

Increase the phone volume, as indicated on the DIC.

Did you complete the adjustment?

Go to Step 18

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Test the audio handset mouthpiece 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 18

Go to Step 7

Test the audio handset earpiece 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 18

Go to Step 8

Test the audio handset low reference 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 18

Go to Step 9

Test the audio handset mouthpiece 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 18

Go to Step 10

Test the audio handset mouthpiece signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 11

Test the audio handset earpiece 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 18

Go to Step 12

Test the audio handset earpiece signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 13

Test the audio handset low reference circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 14

Inspect for poor connections at the harness connector of the cellular telephone interface board. 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 18

Go to Step 15

Replace the cellular telephone handset and handset cord.

Did you find and correct the condition?

Go to Step 18

Go to Step 16

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 18

Go to Step 17

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

Did you complete the replacement?

Go to Step 18

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3