DTC B1232 (1) (HVAC Control Unit)

DTC B1232 or DTC indicator 1  : A short in the evaporator temperature sensor circuit (front)

DTCs (AC)

1. Problem verification

   -1. Clear the DTC with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.

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

   -4. Check for DTCs.

   DTC Description	DTC
   B1232 A short in the evaporator temperature sensor circuit (front)

   Is DTC B1232 or 1 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure. Check for loose wires or poor connections on the front evaporator temperature sensor circuit.

2. Shorted wire check (TEVA line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connectors.

   HVAC control unit connector C (12P)

   Front evaporator temperature sensor 2P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	HVAC control unit connector C (12P): disconnected
   	Front evaporator temperature sensor 2P connector: disconnected
   Test point 1	HVAC control unit connector C (12P) No. 11
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to body ground in the wire between the HVAC control unit and the front evaporator temperature sensor.

   NO 

   The TEVA wire is not shorted. Go to step 3.

3. Shorted wire check (TEVA line to SENSOR (COM) line)

   -1. Disconnect the following connector.

   HVAC control unit connector A (32P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	HVAC control unit connector A (32P): disconnected
   	HVAC control unit connector C (12P): disconnected
   	Front evaporator temperature sensor 2P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 18
   Test point 2	HVAC control unit connector C (12P) No. 11

   Is there continuity?

   YES 

   Repair a short in the wires between the HVAC control unit and the front evaporator temperature sensor.

   NO 

   The TEVA wire to SENSOR (COM) wire are OK. Go to step 4.

4. Front evaporator temperature sensor check

   -1. Test the front evaporator temperature sensor .

   Is the front evaporator temperature sensor OK?

   YES 

   Replace the HVAC control unit .

   NO 

   Replace the front evaporator temperature sensor .