Pinpoint Test M: The Speed Sensitive Volume Does Not Operate Correctly
Information and Entertainment System
Pinpoint Tests
Pinpoint Test M: 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 from the Instrument Cluster (IC). The IC does not generate the VSS signal, it gateways the signal from the PCM.
- DTC U0155 (Lost Communication With Instrument Panel Cluster [IC] Control Module) - sets when the VSS signal is lost for greater than 5 seconds. When the signal is lost, the Audio Control Module (ACM) turns the speed sensitive volume feature off. The Smart Junction Box (SJB) also receives this signal, and should demonstrate symptoms if the VSS signal is lost. If no symptoms are present, this DTC can be ignored, as it may have been set by a low battery voltage condition.
This pinpoint test is intended to diagnose the following:
- Speed sensitive volume setting
- VSS signal concern
- ACM
PINPOINT TEST M: THE SPEED SENSITIVE VOLUME DOES NOT OPERATE CORRECTLY
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M1 CHECK THE SPEEDOMETER OPERATION
- Drive the vehicle and observe the speedometer.
- Does the speedometer operate correctly?
Yes
GO to M2.
No
REFER to Instrument Panel, Gauges and Warning Indicators.
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M2 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. INFORM the customer of the correct operation.
No
GO to M3.
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M3 CHECK FOR DTC U0155
- Ignition OFF.
- Clear the SJB and ACM DTCs.
- Ignition ON.
- Wait 10 seconds, and re-run the ACM self-test.
- Run the SJB self-test.
- Is DTC U0155 present in both the ACM and the SJB?
Yes
GO to M5.
No
GO to M4.
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M4 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) Removal and Replacement. 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. CLEAR the DTCs. REPEAT the self-test.
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M5 CHECK FOR CORRECT IC OPERATION
- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC 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 IC. CLEAR the ACM DTCs. 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. CLEAR the DTCs. REPEAT the self-test.
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