Manufacturer Code Charts: 40

Control System DTCs

DTC Troubleshooting: B1233 - (40)

DTC B1233 or DTC indicator 40 : An Open in the Air Mix Control Motor Circuit (Driver's)


1. Problem verification:

-1. Clear the DTC with the HDS.

-2. Turn the ignition switch to LOCK (0), and then back to ON (II).

-3. Do the Self-Diagnostic Function with the HDS or the climate control unit How to Troubleshoot the Climate Control System.

-4. Check for DTCs.





Is DTC B1233 or 40 indicated?
-YES- Go to step 2.
-NO- Intermittent failure. Check for loose wires or poor connections on the driver's air mix control motor circuit.

2. Open wire check (AMD P DR/AMD-P, SENSOR 5V/S5V, SENSOR COM/SENS-COM lines):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connectors.





-3. Check for continuity between test points 1 and 2 respectively.


















Is there continuity?
-YES- The AMD P DR/AMD-P, SENSOR 5V/S5V, and SENSOR COM/SENS-COM wires are OK. Go to step 3.
-NO- Repair an open in the wire(s) between the climate control unit and the driver's air mix control motor.

3. Driver's air mix control motor check

-1. Test the driver's air mix control motor Drivers Air Mix Control Motor Test (Climate Control).

Is the driver's air mix control motor OK?
-YES- Replace the climate control unit Climate Control Unit Removal And Installation (Climate Control).
-NO- Replace the driver's air mix control motor Drivers Air Mix Control Motor Removal And Installation (Climate Control).