B1726

DTC B1726: Display Panel Control Unit Lost Communication with the Climate Control Unit

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS.

Is DTC B1726 indicated?

YES - Go to step 4.

NO - Intermittent failure.

4. Turn the ignition switch OFF.
5. Disconnect the display panel control unit connector B (6P).
6. Disconnect the climate control unit connector A (20P).




7. Check for continuity between the given terminals of display panel control unit connector B (6P) and climate control unit connector A (20P).

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.

8. Disconnect the driver's and passenger's air mix control motor connectors (5P).




9. Check for continuity between the No. 20 terminal of climate control unit connector A (20P) and body ground.

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.