Pinpoint Test I: The Audio Volume Cutback Is Inoperative

Parking Aid


Pinpoint Tests


Pinpoint Test I: The Audio Volume Cutback Is Inoperative

Normal Operation

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 while the parking aid warning tone is sounded. The sounder increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 30 cm (12 in) of the vehicle, the warning tone becomes continuous.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- PAM
- ACM



PINPOINT TEST I: THE AUDIO VOLUME CUTBACK IS INOPERATIVE

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I1 VERIFY THE PAM COMMUNICATES WITH THE IPC 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 Instrument Panel Cluster (IPC) message center display?

Yes
GO to I3.

No
GO to I2.

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I2 VERIFY THE CORRECT PAM IS INSTALLED


- Check to make sure the correct PAM is installed.
- Is the correct part number PAM installed?

Yes
GO to I3.

No
INSTALL the correct PAM. REFER to Parking Aid Module (PAM) Service and Repair. TEST the system for normal operation.

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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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