Test I: The Volume Cutback Is Inoperative

PINPOINT TEST I: THE VOLUME CUTBACK IS INOPERATIVE

Normal Operation
With the ignition switch in the RUN position and the gear selector in REVERSE (R), the parking aid system calculates the distance to an object by the use of a radar sensor. A 750 Hz variable warning tone is generated by the parking aid sounder. A volume cutback request message is sent to the audio control module (ACM) from the parking aid module (PAM) over the medium speed controller area network (MS-CAN) to decrease the volume of the audio system, so that the parking aid sounder may be clearly heard.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PAM
- ACM

I1-I2:

I3: