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

Information and Entertainment System

Pinpoint Tests

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

Refer to Wiring Diagram Set 130 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Audio System/Navigation for schematic and connector information. Diagrams By Number

Normal Operation

The Audio Control Module (ACM) receives the volume cutback message from the IC. The IC does not generate the volume cutback message; it gateways the signal from the Parking Aid Module (PAM). When the PAM sounds the parking aid tone, it broadcasts an enabled message over the Controller Area Network (CAN). When the ACM receives this message, it reduces the speaker output so that the parking aid tone can be heard more clearly.

This pinpoint test is intended to diagnose the following:

- Parking aid system concern
- ACM




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

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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. Pinpoint Test AH: DTC U0155 Or DTC U0155:00

No
GO to L2.

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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 Collision Avoidance and Parking Assist Systems to continue diagnosis of the parking aid system.

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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) 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.

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