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Symptom Troubleshooting Index

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
Symptom Diagnostic procedure Also check for
CMBS OFF switch does not turn on/turn off (CMBS indicator does not change)
  1. Adaptive cruise control (ACC) system troubleshooting (No DTC Indication) (see ADAPTIVE CRUISE CONTROL (ACC) SYSTEM TROUBLESHOOTING (NO DTC INDICATION) ).
  2. Test the CMBS OFF switch 
  3. Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).
  • An open or increased resistance in the wire
  • A short in the wire
The MID does not indicate when the CMBS OFF switch is operated
  1. Adaptive cruise control (ACC) system troubleshooting (No DTC Indication) (see ADAPTIVE CRUISE CONTROL (ACC) SYSTEM TROUBLESHOOTING (NO DTC INDICATION) ).
  2. Test the CMBS OFF switch 
  3. Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).
  • An open or increased resistance in the wire
  • A short in the wire
The buzzer does not sound
  1. Adaptive cruise control (ACC) system troubleshooting (No DTC Indication) (see ADAPTIVE CRUISE CONTROL (ACC) SYSTEM TROUBLESHOOTING (NO DTC INDICATION) ).
  2. Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).
  
The buzzer does not sound when the CMBS OFF switch is operated
  1. Adaptive cruise control (ACC) system troubleshooting (No DTC Indication) (see ADAPTIVE CRUISE CONTROL (ACC) SYSTEM TROUBLESHOOTING (NO DTC INDICATION) ).
  2. Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).
  
The MID does not indicate with the CMBS operating
  1. Adaptive cruise control (ACC) system troubleshooting (No DTC Indication) (see ADAPTIVE CRUISE CONTROL (ACC) SYSTEM TROUBLESHOOTING (NO DTC INDICATION) ).
  2. Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).
  
The CMBS system operates frequently
  1. Adaptive cruise control (ACC) system troubleshooting (No DTC Indication) (see ADAPTIVE CRUISE CONTROL (ACC) SYSTEM TROUBLESHOOTING (NO DTC INDICATION) ).
  2. Check the millimeter wave radar.
  3. Check the front radar cover for warpage.
  4. Check the wheel alignment.
 Driving conditions, weather, environmental influence
The CMBS system operated without danger of collision
  1. Adaptive cruise control (ACC) system troubleshooting (No DTC Indication) (see ADAPTIVE CRUISE CONTROL (ACC) SYSTEM TROUBLESHOOTING (NO DTC INDICATION) ).
  2. Check the millimeter wave radar.
  3. Check the front radar cover for warpage.
  4. Check the wheel alignment.
 Driving conditions, weather, environmental influence
The CMBS system didn't operate
  1. Adaptive cruise control (ACC) system troubleshooting (No DTC Indication) (see ADAPTIVE CRUISE CONTROL (ACC) SYSTEM TROUBLESHOOTING (NO DTC INDICATION) ).
  2. Check the millimeter wave radar.
  3. Check the front radar cover for warpage.
  4. Check the wheel alignment.
  • Driving conditions, weather, environmental influences
  • Undetectable environment
CMBS indicator does not come on Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).  
CMBS indicator does not go off Symptom troubleshooting  
HDS does not communicate with the adaptive cruise control (ACC) unit or the vehicle Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ). Incorrect HDS software
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