DTC Troubleshooting: B1233 (B-A1), B1233 (40)
DTC B1233 or DTC screen B-A1 or DTC indicator 40: An open in the air mix control motor circuit (driver's)
DTC Description
DTC
B1233 An open in the air mix control motor circuit (driver's)
  

1.
Problem verification:

Problem verification
?1.
Clear the DTCs with the HDS.


?2.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?3.
Do the Self-Diagnostic Function with the HDS or the climate control unit.

?4.
Check for DTCs.
DTC Description
DTC
B1233 An open in the air mix control motor circuit (driver's)
  

Is DTC B1233 or Error on the DTC screen B-A1 (climate control panel without display) or 40 (climate control panel with display) indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure. Check for loose wires or poor connections on the air mix control motor circuit.?
     
NO
     
     
     
Intermittent failure. Check for loose wires or poor connections on the driver's air mix control motor circuit.?
2.
Determine possible failure area (AMD-P-DR line, others):

Determine possible failure area (AMD-P-DR line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Without dual zone control: Air mix control motor 5P connector
With dual zone control: Driver's air mix control motor 5P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Without dual zone control
Test condition
Vehicle ON mode
Air mix control motor 5P connector: disconnected
Test point 1
Air mix control motor 5P connector (female terminals) No. 2:
Test point 2
Body ground

With dual zone control
Test condition
Vehicle ON mode
Driver's air mix control motor 5P connector: disconnected
Test point 1
Driver's air mix control motor 5P connector (female terminals) No. 2:
Test point 2
Body ground


Is there about 5 V?

     
YES
     
     
     
The AMD-P-DR wire is OK. Go to step 3.
     
NO
     
     
     
Go to step 4.
3.
Open wire check (SENS-COM line):

Open wire check (SENS-COM line)
?1.
Measure the voltage between test points 1 and 2.
Without dual zone control
Test condition
Vehicle ON mode
Air mix control motor 5P connector: disconnected
Test point 1
Air mix control motor 5P connector (female terminals) No. 2:
Test point 2
Air mix control motor 5P connector (female terminals) No. 1:

With dual zone control
Test condition
Vehicle ON mode
Driver's air mix control motor 5P connector: disconnected
Test point 1
Driver's air mix control motor 5P connector (female terminals) No. 2:
Test point 2
Driver's air mix control motor 5P connector (female terminals) No. 3:


Is there about 5 V?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the SENS-COM wire.?
4.
Open wire check (AMD-P-DR line):

Open wire check (AMD-P-DR line)
?1.
Measure the voltage between test points 1 and 2.
Without dual zone control
Test condition
Vehicle ON mode
Air mix control motor 5P connector: disconnected
Test point 1
Climate control unit connector B (24P) No. 2
Test point 2
Body ground

With dual zone control
Test condition
Vehicle ON mode
Driver's air mix control motor 5P connector: disconnected
Test point 1
Climate control unit connector B (24P) No. 2
Test point 2
Body ground

Is there about 5 V?

     
YES
     
     
     
Repair an open in the AMD-P-DR wire.?
     
NO