Pinpoint Test G: The Speed Sensitive Volume Does Not Operate Correctly
Information and Entertainment System
Pinpoint Tests
Pinpoint Test G: The Speed Sensitive Volume Does Not Operate Correctly
Normal Operation
The speed sensitive volume function, available with all audio systems except the base AM/FM/Single CD, 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. The Smart Junction Box (SJB) also receives this signal and should exhibit symptoms if the signal is lost.
- DTC U0155 (Lost Communication With Instrument Panel Cluster (IC) Module) - set by the non-navigation Audio Control Module (ACM) when the VSS signal is lost for greater than 5 seconds. When the signal is lost, the ACM turns the speed sensitive volume feature off.
- DTC U0155:00 (Lost Communication With Instrument Panel Cluster (IPC) Control Module) - set by the ACM when the VSS signal is lost for greater than 5 seconds. When the signal is lost, the ACM turns the speed sensitive volume feature off.
This pinpoint test is intended to diagnose the following:
- Speed sensitive volume setting
- VSS signal concern
- ACM
PINPOINT TEST G: THE SPEED SENSITIVE VOLUME DOES NOT OPERATE CORRECTLY
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G1 CHECK THE SPEEDOMETER OPERATION
- Drive the vehicle and observe the speedometer.
- Does the speedometer operate correctly?
Yes
GO to G2.
No
REFER to Instrument Panel, Gauges and Warning Indicators.
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G2 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 G3.
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G3 CHECK FOR DTC U0155 OR DTC U0155:00
- Clear the continuous DTCs from the ACM and the SJB.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds, and re-run the ACM self-test.
- Run the SJB self-test.
- Is DTC U0155:00 (or U0155) present in both the ACM and the SJB?
Yes
GO to G5.
No
GO to G4.
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G4 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. CLEAR any DTCs present. REPEAT the self-test.
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G5 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 any DTCs present. 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 any DTCs present. REPEAT the self-test.
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