Diagnostic Routine M

Diagnostic Routine M

Diagnostic Overview

The SYNC(R) System Audible Prompts Are Inoperative Or Do Not Operate Correctly

Refer to Wiring Diagram Set 130 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

For more information about the SYNC(R) system, REFER to Overview and REFER to Voice Recognition .

Special Tool(s)






Pinpoint Test

1. CHECK THE AUDIBLE PROMPT SETTING

1. Operate the audio system in SYNC(R) mode.

2. Verify the audible prompts are enabled. Refer to " SYNC(R) Voice Recognition Feature" in the Owner's Literature.

3. Press the VOICE button on the steering wheel controls and observe the SYNC(R) audible prompt.

Does the SYNC(R) system produce an audible prompt correctly?








2. CHECK FOR A VOLTAGE SIGNAL FROM THE APIM (Accessory Protocol Interface Module)

NOTICE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool specified in the tool list. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.

1. Operate the audio system in SYNC(R) mode.

2. While pressing the VOICE button repeatedly, measure the AC (Alternating Current) voltage by backprobing:





Is an AC (Alternating Current) voltage produced each time the VOICE switch is pressed?








3. CHECK THE AUDIBLE PROMPT CIRCUITS FOR A SHORT TO VOLTAGE

1. Ignition OFF.

2. Disconnect: ACM (Audio Control Module) C240B.

3. Disconnect: APIM (Accessory Protocol Interface Module).

4. Ignition ON.

5. Measure:





Is any voltage present?








4. CHECK THE AUDIBLE PROMPT CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?








5. CHECK THE AUDIBLE PROMPT CIRCUITS FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?








6. CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION

1. Disconnect and inspect the APIM (Accessory Protocol Interface Module) connector.

2. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

3. Reconnect the APIM (Accessory Protocol Interface Module) connector. Make sure it seats and latches correctly.

4. Wait 2 minutes for the APIM (Accessory Protocol Interface Module) to re-initialize.

5. Operate the system and determine if the concern is still present.

Is the concern still present?








7. CHECK FOR CORRECT ACM (Audio Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all ACM (Audio Control Module) connectors.

3. Repair:

- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals pins
- pushed-out pins - install new pins as necessary

4. Reconnect the ACM (Audio Control Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?