Pinpoint Test H: The Audio Output Does Not Reduce When The Parking Aid Tone Sounds

Parking Aid

Pinpoint Test H: The Audio Output Does Not Reduce When The Parking Aid Tone Sounds

Normal Operation

With the ignition switch in the RUN position and the gear selector in reverse, the parking aid system calculates the distance to an object by the use of a radar sensor. A variable rate warning tone is generated by the parking aid sounder. 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 audio system so that the parking aid sounder can be clearly heard.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- PAM (Parking Aid Module)

- ACM (Audio Control Module)

PINPOINT TEST H : THE AUDIO OUTPUT DOES NOT REDUCE WHEN THE PARKING AID TONE SOUNDS

H1 CHECK THE ACM (Audio Control Module) CONFIGURATION

- Apply the parking brake.

- Place an object behind the vehicle within the range of the parking aid sensor.

- Ignition ON.

- Apply the brake pedal and place the gear selector in reverse.

- Enter the following diagnostic mode on the scan tool: ACM (Audio Control Module) DataLogger.

- Monitor the parking aid input status PID (RPA_STAT) while the parking aid tone is sounding.

Does the PID read "Enabled" while the parking aid tone is sounding?

Yes
GO to H3.

No
GO to H2.

H2 CHECK COMMUNICATION WITH THE ACM (Audio Control Module)

- Carry out the network test using the scan tool.

Does the ACM (Audio Control Module) pass the network test?

Yes
GO to H3.

No
REFER to Information Bus to diagnose network communication.

H3 CHECK FOR CORRECT ACM (Audio Control Module) OPERATION

- Disconnect the ACM (Audio Control Module) connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the ACM (Audio Control Module) 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 ACM (Audio Control Module). TEST the system for normal operation.

No
The system is operating correctly at this time.