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. Connect the handset to the cellular telephone interface board.
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

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

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

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

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 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

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

Test the controlled power low reference circuit for an open or a short to 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 10

Test the low reference circuit of the cellular telephone module 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 20

Go to Step 11

Test the low reference 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

Test the handset keypad data 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 20

Go to Step 13

Test the handset keypad data signal 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

Test the display 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 20

Go to Step 15

Test the display signal 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

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 20

Go to Step 17

Replace the cellular telephone handset and handset cord.

Did you find and correct the condition?

Go to Step 20

Go to Step 18

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 20

Go to Step 19

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

Did you complete the replacement?

Go to Step 20

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3