Pinpoint Test H: The Audio Output Does Not Reduce When The Parking Aid Tone Sounds
Parking Aid
Pinpoint Tests
Pinpoint Test H: The Audio Output 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, 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 can be clearly heard.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PAM
- ACM
PINPOINT TEST H: THE AUDIO OUTPUT DOES NOT REDUCE WHEN THE PARKING AID TONE SOUNDS
-------------------------------------------------
H1 CHECK THE ACM CONFIGURATION
- Apply the parking brake.
- Place an object behind the vehicle within the range of the parking aid sensor.
- Ignition ON.
- Apply the brake pedal and place the gear selector in reverse.
- 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 H3.
No
GO to H2.
-------------------------------------------------
H2 CHECK COMMUNICATION WITH THE ACM
- Carry out the network test using the scan tool.
- Does the ACM pass the network test?
Yes
GO to H3.
No
REFER to Module Communications Network Testing and Inspection to diagnose network communication.
-------------------------------------------------
H3 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.
-------------------------------------------------