DTC U0155: Climate Control Unit Lost Communication with Gauge Control Module

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 DTC with the HDS.
Turn the ignition switch to LOCK (0), and then to ON (II).
Do the Self-Diagnostic Function with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS ).
Check for DTCs.
Is DTC U0155 indicated?

YES -Go to step 5.

NO -The system is OK at this time. Check for loose wires or poor connections at the gauge control module and the climate control unit.
Select UNIT INFORMATION in the BODY ELECTRICAL menu.
Select CONNECTED UNIT in the UNIT INFORMATION menu.
Is the gauge control module detected?

YES -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit; with navigation system (see WITH NAVIGATION SYSTEM ), without navigation system (see WITH NAVIGATION SYSTEM ).

NO -Go to step 7.
Turn the ignition switch to LOCK (0).
Disconnect driver's under-dash fuse/relay box connector P (20P).
Disconnect the gauge control module 32P connector.
Disconnect climate control unit connector B (12P).
Check for continuity between the following terminals of driver's under-dash fuse/relay box connector P (20P), the gauge control module 32P connector, and climate control unit connector B (12P).
20P: 32P:

No. 5 No. 30

No. 6 No. 31

12P: 32P:

No. 5 No. 31

No. 6 No. 30

Fig 1: Checking For Continuity Between Terminals Of Driver's Under-Dash Fuse/Relay Box Connector P (20P) And Climate Control Unit Connector B (12P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Checking For Continuity Between Terminals Of Gauge Control Module 32P Connector, And Climate Control Unit Connector B (12P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to the gauge control module input test (see GAUGE CONTROL MODULE INPUT TEST ).

NO -Repair an open in the wire between the Driver's MICU and the gauge control module, or an open in the wire between the climate control unit and the gauge control module.