DTC 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

DTC (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 

   The failure is duplicated. 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. Measure the resistance 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 1.0 Ω or less?

   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. Measure the resistance 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 1.0 Ω or less?

   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. Measure the resistance 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 1 MΩ or more?

   YES 

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

   NO 

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

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

   -1. Measure the resistance 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 1 MΩ or more?

   YES 

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

   NO 

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

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.