DTC B1726: Display Panel Control Unit Lost Communication with the Climate Control Unit
- Clear the DTC by turning the ignition switch to LOCK (0), and then to ON (II).
- Operate the climate control system in several modes.
- Check for DTCs using the self-diagnosis or HDS.
Is DTC B1726 indicated?
YES -Go to step 4.
NO -Intermittent failure.
- Turn the ignition switch to LOCK (0).
- Disconnect the display panel control unit connector B (6P).
- Disconnect climate control unit connector A (20P).
- Check for continuity between the following terminals of display panel control unit connector B (6P) and climate control unit connector A (20P).
6P: 20P:
No. 1 No. 4
No. 2 No. 13
No. 3 No. 2
No. 4 No. 12
No. 5 No. 11
Fig 1: Checking Continuity Between Display Panel Control Unit Connector Terminals B (6P) And Climate Control Unit Connector A (20P)Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Go to step 8.
NO -Repair open in the wire(s) between the display panel control unit and the climate control unit connector.
- Disconnect the driver's and passenger's air mix control motor connectors (5P).
- Check for continuity between the No. 20 terminal of climate control unit connector A (20P) and body ground.Fig 2: Checking Continuity Between No. 20 Terminal Of Climate Control Unit Connector A (20P) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair short to body ground in the wire between the climate control unit and the driver's and passenger's air mix control motors.
NO -Check for loose wires or poor connections at display panel control unit connector B (6P) and at climate control unit connector A (20P). If the connections are good, substitute a known-good display panel control unit and/or climate control unit, and recheck. If the symptom/indication goes away, replace the original display panel control unit and/or climate control unit.