DTC 100: CMBS Initial Check Incomplete

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.

NOTE: The CMBS initial check function checks the communication between the adaptive cruise control (ACC) unit and the VSA modulator-control unit.

If the CMBS initial check is incomplete, the ACC and CMBS indicators come on. For the CMBS to operate properly, always do the CMBS initial check after replacing the ACC unit or the VSA modulator-control unit.

Turn the ignition switch to ON (II), then wait for 10 seconds.
Watch the VSA indicator.
Does the VSA indicator come on?

YES -Troubleshoot the indicated VSA system DTC(s).

NO -Go to step 3.
Check for VSA system DTCs with the HDS (see PUMP MOTOR ).
Are any DTCs indicated?

YES -Troubleshoot the indicated VSA system DTC(s).

NO -Go to step 4.
Start the engine.
Select CMBS from the DRIVING SUPPORT menu, then enter the MISCELLANEOUS TEST.
Do the CMBS brake operation.
Watch the ACC and CMBS indicators.
Do both indicators come on?

YES -Go to step 8.

NO -The system is OK at this time. The CMBS initial check is complete.
Check for ACC system DTCs with the HDS (see HOW TO RETRIEVE DTCS ).
Are any DTCs except DTC 100 indicated?

YES -Troubleshoot the indicated DTC(s).

NO -Check for loose or poor connections. If OK, update the ACC unit (see ACC UNIT UPDATE ), then recheck. If the ACC unit was already updated, replace the ACC unit, (see ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION )