Volume Does Not Increase With Speed

Symptom Troubleshooting: Volume does not increase with speed

Volume does not increase with speed

NOTE:

- Check the connectors for poor connections or loose terminals.

- Check the vehicle battery condition first.

1. Verify the (SVC) mode setting in the navigation or audio unit sound set-up.

Is the (SVC) set to off?
YES - Change the setting to Mid and reset. Audio System Description

NO - Go to step 2.


2. Do the self-diagnostic function for the vehicle speed pulse indication. How to Troubleshoot the Audio System

Does the self-diagnostic function indicate a VSP signal?
YES - Substitute a known-good navigation or audio unit and retest. If the symptom/indication goes away, replace the original navigation or audio unit. Audio Unit Removal/Installation

NO - Go to step 3.


3. Check for B-CAN codes with the HDS.

Are there any B-CAN codes?
YES - Go to the applicable B-CAN code troubleshooting.

NO - Go to step 4.


4. Inspect the VSP signal in the navigation system. Navigation System Diagnostic Mode (With Navigation)

Does the VSP change from 0 to 1 when the vehicle is moving?
YES - Substitute a known-good audio unit, then retest the VSP signal in the audio self-diagnostic test. If the speed is shown, replace the original audio unit. Audio Unit Removal/Installation If so speed is shown, substitute a known-good navigation unit.

NO - Inspect the VSP circuit. Description and Operation