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

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

U1 CHECK THE PARKING AID SIGNAL
- Apply the parking brake.
- Place an object behind the vehicle within the range of the parking aid sensors. Refer to PARKING AID -- FUSION, MILAN & MKZ article.
- 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" when the parking aid tone is sounding?
- Yes : GO to U2.
- No : REFER to PARKING AID -- FUSION, MILAN & MKZ article to continue diagnosis of the parking aid system.
U2 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 AUDIO CONTROL MODULE (ACM) - FUSION, MILAN or AUDIO CONTROL MODULE (ACM) - MKZ in this service information. 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.