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

Information and Entertainment System

Pinpoint Tests

Pinpoint Test N: 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 Audio Control Module (ACM) via the Medium Speed Controller Area Network (MS-CAN). When the PAM sounds the parking aid tone, it sends an enabled message to the ACM. When the ACM receives this message, it reduces the speaker output so that the parking aid tone can be heard more clearly.

- DTC U0159 (Lost Communication With Parking Assist Control Module (PAM)) - sets when the volume cutback message is missing for greater than 5 seconds. When the message is missing, the ACM defaults to no volume cutback when the parking aid tone is sounding.

This pinpoint test is intended to diagnose the following:

- Parking aid system concern
- ACM



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

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N1 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 Collision Avoidance and Parking Assist Systems.
- 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).
- Does the RPA_STAT PID read "Enabled" ?

Yes
GO to N2.

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

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N2 CHECK FOR COMMUNICATION WITH THE PAM


- Carry out the network test using the scan tool.
- Does the scan tool communicate with the PAM?

Yes
GO to N3.

No
REFER to Information Bus.

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N3 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) - Fusion, Milan Audio Control Module (ACM) - Fusion, Milan or Audio Control Module (ACM) - MKZ . 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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