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

Parking Aid

Pinpoint Tests

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

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 variable rate 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



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

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C1 CHECK THE ACM CONFIGURATION


- 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 DataLogger .
- Monitor the RPA_STAT (Parking Aid Input Status) PID while the parking aid tone is sounding.
- Does the RPA_STAT PID read "Active" while the parking aid tone is sounding?

Yes
GO to C3.

No
GO to C2.

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C2 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 C3.

No
REFER to Information Bus to diagnose no communication with the PAM.

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C3 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. 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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