Skip to main content
Audio System Symptom Troubleshooting - Volume does not increase with speed

Volume does not increase with speed
NOTE:
  • Check the vehicle battery condition first.
  • Check the connectors for poor connections or loose terminals.
  1. Test-drive the vehicle at highway speeds and monitor if the volume increases.
Does the volume increase?
YES -
Intermittent failure, the system is OK at this time.■
NO -
Go to Step 2 .
  1. Verify SVC mode setting in audio unit sound adjustment set-up.
Is the SVC set to off?
YES -
Change setting to MID and retest.■
NO -
Go to Step 3 .
  1. Turn the ignition switch to LOCK (0).
  1. Remove the audio unit , and disconnect audio unit connector A (24P).
    NOTE: Eject the CD before removing the audio unit to prevent damaging the CD player's load mechanism.
  1. Turn the ignition switch to ON (II).
  1. Drive the vehicle and have an assistant measure the voltage at audio unit connector A (24P) terminal No. 15.
Is there a 0−5 V pulse?
YES -
Substitute a known-good audio unit, and recheck. If the symptom/indication goes away, replace the original audio unit.■
NO -
Repair opens or shorts in the wire between audio unit connector A (24P) No. 15 terminal and ECM/PCM connector A (49P) No. 30 terminal. If no opens are found, substitute a known-good ECM/PCM and recheck. If the symptom/indicated goes away, replace the original ECM/PCM.