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

PINPOINT TEST Q: 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 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

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