Pinpoint Test I: The Audio Volume Cutback Command Is Inoperative

Parking Aid

Pinpoint Test I: The Audio Volume Cutback Command Is Inoperative

Normal Operation

A variable rate warning tone is generated by the parking aid sounder. While the sounder is active, the sounder increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 46 cm (18 in) of the vehicle, the warning tone becomes continuous. A volume cutback request message is sent to the Audio Control Module (ACM) from the Parking Aid Module (PAM) over the Medium Speed Controller Area Network (MS-CAN) to decrease the volume of the ACM.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- PAM
- ACM


PINPOINT TEST I: THE AUDIO VOLUME CUTBACK COMMAND IS INOPERATIVE

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I1 VERIFY THE PAM COMMUNICATES WITH THE IC MESSAGE CENTER DISPLAY.

- Apply the parking brake.
- Ignition ON.
- Apply the brake pedal and place the gear selector in REVERSE (R).
- Disable/enable the parking aid system by pressing the reset button on the message center switch.
- Can the PAM be disabled/enabled in the IPC message center display?

Yes
GO to I3.

No
GO to I2.

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I2 CHECK THE SCAN TOOL COMMUNICATION

- NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during Programmable Module Installation (PMI) or the PMI may not have been carried out.
- Carry out the network test using the scan tool.
- Does the ACM pass the network test?

Yes
GO to I3.

No
REFER to Module Communications Network Testing and Inspection to diagnose network communication.

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I3 CHECK FOR CORRECT PAM OPERATION

- Disconnect the PAM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the PAM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new PAM. REFER to Parking Aid Module (PAM) Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time.

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