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

Information and Entertainment System

Pinpoint Tests

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 gateways the message to the Audio Control Module (ACM) via the Medium Speed Controller Area Network (MS-CAN). When the PAM sounds the parking aid tone, the ACM 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

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

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J1 CHECK FOR DTCs

- Carry out the ACM 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.

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J2 CHECK THE PARKING AID SIGNAL

- Apply the parking brake.
- Place an object behind the vehicle within the range of the parking aid sensors. Refer to Parking Aid Azimuth System Check.
- Ignition ON.
- Place the transmission in REVERSE (R).
- Enter the following diagnostic mode on the scan tool: ACM 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 Parking Aid Testing and Inspection to continue diagnosis of the parking aid system.

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J3 CHECK FOR CORRECT ACM OPERATION

- Disconnect all the ACM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM 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. REFER to Audio Control Module (ACM) 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.

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