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

Parking Aid

Pinpoint Tests

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

Normal Operation

When the parking aid system is active, a volume cutback request message is sent to the Body Control Module (BCM) from the Parking Aid Module (PAM) over the High Speed Controller Area Network (HS-CAN). The volume cutback request message is sent from the BCM over the Medium Speed Controller Area Network (MS-CAN) to the ACM to decrease the volume of the ACM while the parking aid warning sounds. The sounder increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 30 cm (12 in) of the vehicle, the warning tone becomes continuous.

This pinpoint test is intended to diagnose the following:

- Communication network concern
- PAM
- ACM

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

-------------------------------------------------
G1 CHECK FOR CORRECT PARKING AID SYSTEM OPERATION

- Apply the parking brake.
- Place an object behind the vehicle within range of the parking aid sensors.
- Ignition ON.
- Place the transmission in REVERSE (R).
- Verify the parking aid tone is sounding and the ACM volume is reduced.
- Is the parking aid tone sounding and ACM volume reduced?

Yes
The system is operating correctly at this time.

No
GO to G2.

-------------------------------------------------
G2 CHECK THE PARKING AID MESSAGE TO THE ACM

- 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 "Enabled" while the parking aid tone is sounding?

Yes
GO to G4.

No
GO to G3.

-------------------------------------------------
G3 CHECK FOR CORRECT PAM OPERATION

- Disconnect the PAM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the PAM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new PAM. REFER to Parking Aid Module (PAM) Service and Repair. CLEAR the DTCs. 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. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------
G4 CHECK FOR CORRECT ACM OPERATION

- Disconnect the ACM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the ACM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new ACM. REFER to Information and Entertainment Systems 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.

-------------------------------------------------