DTC Troubleshooting: B1236 (B-A4)

DTC B1236 or DTC screen B-A4  : An open in the passenger's air mix control motor circuit

DTCs (AC)

1. 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
   B1236 An open in the passenger's air mix control motor circuit

   Is DTC B1236 or Error on the DTC screen B-A4 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure. Check for loose wires or poor connections on the passenger's air mix control motor circuit.

2. Determine possible failure area (AMD-P-AS line, others)

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

   -2. Disconnect the following connector.

   Passenger'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.

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

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5 V?

   YES 

   The AMD-P-AS wire is OK. Go to step 3.

   NO 

   Go to step  4.

3. Open wire check (SENS-COM line)

   -1. Measure the voltage between test points 1 and 2.

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

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5 V?

   YES 

   Replace the passenger's air mix control motor .

   NO 

   Repair an open in the SENS-COM wire.

4. Open wire check (AMD-P-AS line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Passenger's air mix control motor 5P connector: disconnected
   Test point 1	Climate control unit connector B (24P) No. 3
   Test point 2	Body ground

   Is there about 5 V?

   YES 

   Repair an open in the AMD-P-AS wire.

   NO 

   Replace the climate control unit .