Pinpoint Test W: The Speed Sensitive Volume Does Not Operate Correctly

Information and Entertainment System

Pinpoint Test W: The Speed Sensitive Volume Does Not Operate Correctly

Normal Operation

The speed sensitive volume function adjusts the volume based on the Vehicle Speed Sensor (VSS) signal, which is received over the Controller Area Network (CAN) Other modules also receive this signal and should exhibit symptoms if the signal is lost.

This pinpoint test is intended to diagnose the following:

- Speed sensitive volume setting
- VSS signal concern
- Communication network concern
- ACM

PINPOINT TEST W: THE SPEED SENSITIVE VOLUME DOES NOT OPERATE CORRECTLY

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W1 CHECK THE SPEEDOMETER OPERATION

- Drive the vehicle and observe the speedometer.
- Does the speedometer operate correctly?

Yes
GO to W2.

No
REFER to Instrumentation, Message Center, and Warning Chimes Testing and Inspection.

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W2 CHECK THE SPEED SENSITIVE VOLUME SETTING

- Turn the speed sensitive volume off. Refer to the Owner's Literature.
- Operate the audio system in radio tuner (AM/FM) mode.
- Drive the vehicle at various speeds and observe the speaker volume.
- Set the speed sensitive volume to maximum compensation. Refer to the Owner's Literature.
- Operate the audio system in radio tuner (AM/FM) mode.
- Drive the vehicle at various speeds and observe the speaker volume.
- Does the volume remain constant with the speed sensitive volume turned off, and increase and decrease with vehicle speed with the speed sensitive volume set to maximum?

Yes
The system is operating correctly at this time. INSTRUCT the customer in the correct usage of the speed sensitive volume feature.

No
GO to W3.

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W3 CHECK FOR DTC U0155:00 SET IN THE FCDIM

- Carry out the FCDIM self-test.
- Is DTC U0155:00 present?

Yes
GO to Pinpoint Test U. Pinpoint Test U: DTC U0155:00

No
GO to W4.

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W4 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 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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