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

A variable rate warning tone is generated by the parking aid sounder. A volume cutback request message is sent to the Instrument Panel Cluster (IPC) from the Parking Aid Module (PAM) over the High Speed Controller Area Network (HS-CAN), then gatewayed to the Audio Control Module (ACM) to decrease the volume of the audio system, so that the parking aid sounder can be clearly heard.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- PAM
- ACM



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

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G1 CHECK FOR CORRECT PARKING AID SYSTEM OPERATION


- 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).
- 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. The ACM volume cutback may have faulted due to high network traffic or an intermittent fault condition.

No
GO to G2.

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G2 CHECK THE PARKING AID SIGNAL


- 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 parking aid input status PID (RPA_STAT) while the parking aid tone is sounding.
- Does the PID read "Enabled" while the parking aid tone is sounding?

Yes
GO to G4.

No
GO to G3.

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G3 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 G4.

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

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G4 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 Accessories and Optional Equipment. 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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