DTC Troubleshooting: B1238 (B-A6)

DTC B1238 or DTC screen B-A6  : A problem in the passenger's air mix control motor circuit, linkage, door, or motor

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
   B1238 A problem in the passenger's air mix control motor circuit, linkage, door, or motor

   Is DTC B1238 or Error on the DTC screen B-A6 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. Open wire check (M-HOT-AS line)

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

   -2. Disconnect the following connectors.

   Climate control unit connector B (24P)

   Passenger's air mix control motor 5P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector B (24P): disconnected
   	Passenger's air mix control motor 5P connector: disconnected
   Test point 1	Climate control unit connector B (24P) No. 15
   Test point 2	Passenger's air mix control motor 5P connector (female terminals) No. 5:

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

   Is there continuity?

   YES 

   The M-HOT-AS wire is not open. Go to step 3.

   NO 

   Repair an open in the M-HOT-AS wire.

3. Open wire check (M-COOL-AS line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector B (24P): disconnected
   	Passenger's air mix control motor 5P connector: disconnected
   Test point 1	Climate control unit connector B (24P) No. 16
   Test point 2	Passenger's air mix control motor 5P connector (female terminals) No. 4:

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

   Is there continuity?

   YES 

   The M-COOL-AS wire is not open. Go to step 4.

   NO 

   Repair an open in the M-COOL-AS wire.

4. Shorted wire check (M-HOT-AS line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector B (24P): disconnected
   	Passenger's air mix control motor 5P connector: disconnected
   Test point 1	Climate control unit connector B (24P) No. 15
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the M-HOT-AS wire.

   NO 

   The M-HOT-AS wire is OK. Go to step 5.

5. Shorted wire check (M-COOL-AS line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector B (24P): disconnected
   	Passenger's air mix control motor 5P connector: disconnected
   Test point 1	Climate control unit connector B (24P) No. 16
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the M-COOL-AS wire.

   NO 

   The M-COOL-AS wire is OK. Go to step 6.

6. Passenger's air mix control motor check

   -1. Test the passenger's air mix control motor check .

   Is the passenger's air mix control motor OK?

   YES 

   Replace the climate control unit .

   NO 

   Replace the passenger's air mix control motor , or repair the passenger's air mix control linkage or door.