DTC Troubleshooting: B1233 (40)
DTC B1233 or DTC indicator 40: An Open in the Air Mix Control Motor Circuit
DTC Description
DTC
B1233 An Open in the Air Mix Control Motor Circuit
  

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
  

Is DTC B1233 or 40 indicated?

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

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

?2.
Disconnect the following connector.
Air mix control motor 5P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Air mix control motor 5P connector: disconnected
Test point 1
Air mix control motor 5P connector No. 2
Test point 2
Body ground


Is there about 5 V?

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

Open wire check (SENSOR COM/SENS-COM line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Air mix control motor 5P connector: disconnected
Test point 1
Air mix control motor 5P connector No. 1
Test point 2
Air mix control motor 5P connector No. 2


Is there about 5 V?

     
YES
     
     
     
The SENSOR COM/SENS-COM wire is OK. Replace the air mix control motor.?
     
NO
     
     
     
Repair an open in the wire between the climate control unit and the air mix control motor.?
4.
Open wire check (AMD-P/AMP-P line):

Open wire check (AMD-P/AMP-P line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Air mix control motor 5P connector: disconnected
Test point 1
Climate control unit 32P connector No. 28
Test point 2
Body ground

Is there about 5 V?

     
YES
     
     
     
Repair an open in the wire between the climate control unit and the air mix control motor.?
     
NO
     
     
     
The AMD-P/AMP-P wire is not open. Replace the climate control unit.?