DTC B1233 or DTC indicator B and WINDSHIELD DEFROST: An Open in the Air Mix Control Motor Circuit (Driver's)

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 climate control unit (see HOW TO USE THE CLIMATE CONTROL UNIT SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS ).
Check for DTCs.
Is DTC B1233 or B and WINDSHIELD DEFROST indicated?

YES -Go to step 5.

NO -Intermittent failure. Check for loose wires or poor connections on the driver's air mix control motor circuit.
Turn the ignition switch to LOCK (0).
Test the driver's air mix control motor (see FRONT AIR MIX CONTROL MOTOR TEST ).
Is the driver's air mix control motor OK?

YES -Go to step 7.

NO -Replace the driver's air mix control motor (see FRONT AIR MIX CONTROL MOTOR REPLACEMENT ).
Disconnect the driver's air mix control motor 7P connector.
Disconnect climate control unit connector A (28P).

Check for continuity between the following terminals of climate control unit connector A (28P) and the driver's air mix control motor 7P connector.

CONTINUITY REFERENCE

28P:	7P:
No. 13	No. 3
No. 24	No. 5
No. 25	No. 1

Fig 1: Checking Continuity Between Terminals Of Climate Control Unit And Driver's Air Mix Control Motor Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Check for loose wires or poor connections at climate control unit connector A (28P) and at the driver's air mix control motor 7P connector. If the connections are good, substitute a known-good climate control unit and recheck. If the symptom/indication goes away, replace the original climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ).

NO -Repair an open in the wire(s) between the climate control unit and the driver's air mix control motor.