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

Information and Entertainment System

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

Normal Operation

The Audio Control Module (ACM) receives the volume cutback message from the Instrument Panel Cluster (IPC). The IPC (Instrument Panel Cluster) does not generate the volume cutback message; it gateways the signal from the Parking Aid Module (PAM). When the PAM (Parking Aid Module) sounds the parking aid tone, it broadcasts an enabled message over the Controller Area Network (CAN). When the ACM (Audio Control Module) receives this message, it reduces the speaker output so that the parking aid tone can be heard more clearly.

This pinpoint test is intended to diagnose the following:

- Parking aid system concern

- ACM (Audio Control Module)

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

U1 CHECK FOR DTC U0155 OR DTC U0155:00

- Using the scan tool, retrieve all continuous DTCs.

Is DTC U0155 or DTC U0155:00 retrieved in any module?

Yes
GO to Pinpoint Test AG. Pinpoint Test AG: DTC U0155 Or DTC U0155:00

No
GO to U2.

U2 CHECK THE PARKING AID SIGNAL

- Apply the parking brake.

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

- Ignition ON.

- Place the transmission in REVERSE (R).

- 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" when the parking aid tone is sounding?

Yes
GO to U3.

No
REFER to Collision Avoidance and Parking Assist Systems to continue diagnosis of the parking aid system.

U3 CHECK FOR CORRECT ACM (Audio Control Module) OPERATION

- Disconnect all the ACM (Audio Control Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the ACM (Audio Control Module) connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new ACM (Audio Control Module). REFER to Audio Control Module (ACM) . TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.