Pinpoint Test F: The Speed Sensitive Volume Does Not Operate Correctly
Information and Entertainment System
Pinpoint Tests
Pinpoint Test F: The Speed Sensitive Volume Does Not Operate Correctly
Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information. Diagrams By Number
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 ACM turns the speed sensitive volume feature off. The Smart Junction Box (SJB) and HVAC module - Electronic Automatic Temperature Control (EATC) also receive 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 F: THE SPEED SENSITIVE VOLUME DOES NOT OPERATE CORRECTLY
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F1 CHECK THE SPEEDOMETER OPERATION
- Drive the vehicle and observe the speedometer.
- Does the speedometer operate correctly?
Yes
GO to F2.
No
REFER to Instrument Panel, Gauges and Warning Indicators to diagnose the inoperative speedometer.
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F2 CHECK THE SPEED SENSITIVE VOLUME SETTING
- Turn the speed sensitive volume off.
- For vehicles without navigation, press MENU until the speed sensitive volume prompt is reached, then press TUNE DOWN until the feature is turned off.
- For vehicles with navigation, press SOUND, select the SCV tab, and turn the feature off.
- 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.
- For vehicles without navigation, press MENU until the speed sensitive volume prompt is reached, then press TUNE UP until the feature is set to setting "7".
- For vehicles with navigation, press SOUND, select the SCV tab, then press "7".
- 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 correct operation.
No
GO to F3.
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F3 CHECK FOR DTC U0155
- Ignition ON.
- Using the scan tool, clear any ACM continuous DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Retrieve the ACM continuous DTCs.
- Is DTC U0155 present?
Yes
GO to F4.
No
GO to F5.
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F4 CHECK FOR COMMUNICATION WITH THE IC
- Carry out the network test using the scan tool.
- Does the scan tool communicate with the IC?
Yes
GO to F5.
No
REFER to Information Bus.
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F5 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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