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

Information and Entertainment System

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

Normal Operation

The Parking Aid Module (PAM) sends the volume cutback message to the Body Control Module (BCM) via the High Speed Controller Area Network (HS-CAN). The BCM (Body Control Module) gateways the message to the Audio Front Control Module (ACM) via the Medium Speed Controller Area Network (MS-CAN). When the PAM (Parking Aid Module) sounds the parking aid tone, the ACM (Audio Front Control Module) 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 Front Control Module)

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

J1 CHECK FOR DTCs

- Carry out the ACM (Audio Front Control Module) self-test using the scan tool.

Is DTC U0159:00 present?

Yes
GO to Pinpoint Test X. Pinpoint Test X: DTC U0159:00
No
GO to J2.

J2 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 Front 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 J3.
No
REFER to Collision Avoidance and Parking Assist Systems to continue diagnosis of the parking aid system.

J3 CHECK FOR CORRECT ACM (Audio Front Control Module) OPERATION

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

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the ACM (Audio Front 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 Front 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.