DTC B1233 or DTC indicator 2: An Open in the Air Mix Control Motor Circuit (Front)
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Do the self-diagnostic function with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS ) or the HVAC control unit (see HOW TO USE THE HVAC CONTROL UNIT SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS ).
- Check for DTCs.
Is DTC B1233 or 2 indicated?
YES -Go to step 5.
NO -Intermittent failure, check for loose wires or poor connections in the front air mix control motor circuit.
- Turn the ignition switch to LOCK (0).
- Test the front air mix control motor (see FRONT AIR MIX CONTROL MOTOR TEST
).
Is the front air mix control motor OK?
YES -Go to step 7.
NO -Replace the front air mix control motor (see FRONT AIR MIX CONTROL MOTOR REPLACEMENT ).
- Disconnect the front air mix control motor 7P connector.
- Disconnect HVAC control unit connector A (24P).
- Check for continuity between the following terminals of HVAC control unit connector A (24P) and the front air mix control motor 7P connector.
24P: 7P:
No. 4 No. 5
No. 14 No. 7
No. 16 No. 3
Fig 1: Checking Continuity Between Terminals Of HVAC Control Unit Connector A (24P) And Front Air Mix Control Motor 7P ConnectorCourtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Check for loose wires or poor connections at HVAC control unit connector A (24P) and at the front air mix control motor 7P connector. If the connections are good, substitute a known-good HVAC control unit and recheck. If the symptom/indication goes away, replace the original HVAC control unit (see HVAC CONTROL UNIT REMOVAL/INSTALLATION ).
NO -Repair an open in the wire(s) between the HVAC control unit and the front air mix control motor.