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

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

L1 CHECK FOR DTC U0155 OR DTC U0155:00
- Using the scan tool, retrieve all continuous DTCs.
- Is DTC U0155 or DTC U0155:00 retrieved in any module?
- Yes: GO to PINPOINT TEST AH .
- No: GO to L2 .
L2 CHECK THE PARKING AID SIGNAL
- Apply the parking brake.
- Place an object behind the vehicle within the range of the parking aid sensors.
- Ignition In ACC.
- 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 L3 .
- No: REFER to PARKING AID to continue diagnosis of the parking aid system.
L3 CHECK FOR CORRECT ACM OPERATION
- Ignition OFF.
- 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 determine if the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new ACM . REFER to 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.