Troubleshooting - B-CAN System Diagnosis Test Mode B
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.
Do this diagnosis if any of the control units are not communicating (Not Available is displayed in the HDS) as found by the B-CAN System Diagnosis Test Mode A
- Using the HDS, select the system that has the symptom from the BODY ELECTRICAL SYSTEM SELECT menu.
- Select DTCs, and then check for loss of communication DTCs.
Are any loss of communication DTCs indicated?
YES -Go to step 3.
NO -Replace the MICU.
- Do the power, ground, and communication part of the input test for the unit(s) not communicating with the HDS.NOTE: Troubleshoot Rear MICU loss of communication DTCs before troubleshooting AcuraLink control unit (XM receiver), the power tailgate control unit, and the power seat control unit DTC.
Unit not communicating MICU Gauge control module (see GAUGE CONTROL MODULE INPUT TEST ) Relay control module Driver's MPCS unit DRIVER'S MPCS UNIT INPUT TEST ) Combination switch control unit WIPER/WASHER SWITCH (COMBINATION SWITCH CONTROL UNIT) INPUT TEST ) Immobilizer-keyless control unit IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST ) Rear MICU Power seat control unit POWER SEAT CONTROL UNIT INPUT TEST ) Power tailgate control unit CONTROL UNIT INPUT TEST/REPLACEMENT ) Climate control unit CLIMATE CONTROL UNIT POWER AND GROUND CIRCUIT TROUBLESHOOTING ) BSI control unit BLIND SPOT INFORMATION SYSTEM (BSI) CONTROL UNIT INPUTS AND OUTPUTS ) HandsFreeLink control unit CONTROL UNIT INPUT TEST ) AcuraLink control unit ACURALINK CONTROL UNIT (XM RECEIVER) CONNECTOR FOR INPUTS AND OUTPUTS )