DTC U0164: Door Multiplex Control Unit Lost Communication With Climate Control Unit

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0) and then back to ON (II).
Wait for at least 6 seconds.
Check for DTCs with the HDS.
Is DTC U0164 indicated?

YES -Go to next step.

NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections between the door multiplex control unit and climate control unit.
From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS.
Is the climate control unit detected?

YES -Go to 10 .

NO -Go to step 10
Measure the voltage between body ground and climate control unit connector A (28P) terminal No. 6.

Fig 1: Identifying Door Multiplex Control Unit 37P No. 36 Connector Terminal Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.

*1 With Navigation

*2 Without Navigation

Is there battery voltage?

YES -Go to 9.

NO -Go to next step.
Turn the ignition switch to LOCK (0).
Check the No.B16 (7.5A) fuse in the driver's under-hood fuse/relay box.
Is the fuse OK?

YES -Repair an open or high resistance in the No. B16 (7.5A) fuse circuit.

NO -Replace the fuse. If the fuse blows up again, repair a short to ground on the No. B16 (7.5A) fuse circuit.
Measure the voltage between body ground and climate control unit connector B (12P) terminals No. 4.

Fig 2: Identifying Door Multiplex Control Unit 37P No. 36 Connector Terminal Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2V?

YES -Go to next step.

NO -Repair an open or high resistance in the ground wire or poor ground (G502).
Turn the ignition switch to LOCK (0).
Disconnected climate control unit connector A (28P).
Disconnect the power window master switch 37P connector.
Check for continuity between climate control unit connector B (12P) terminals No. 5 and No. 6 and power window master switch 37P connector terminals No. 28 and No. 30 respectively.

Fig 3: Identifying Door Multiplex Control Unit 37P No. 36 Connector Terminal Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.

*1 With Navigation

*2 Without Navigation

Is there continuity?

YES -Replace the climate control unit, with navigation (see WITH NAVIGATION SYSTEM ), without navigation (see WITHOUT NAVIGATION SYSTEM ).

NO -Repair an open or poor connection in the B-CAN wire(s) between the door multiplex control unit and the climate control unit.