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Home >> Honda >> 2021 >> CR-V EX-L, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (HVAC System - Diagnostics (Hybrid)) >> DTC Troubleshooting >> DTC B1234 (B-A2), B1234 (41)

DTC B1234 (B-A2), B1234 (41)

WARNING: This page is about a different variant/trim than selected.

DTC B1234, DTC screen B-A2, or DTC screen 41  : A short in the air mix control motor circuit (driver's)

NOTE:  If other short circuit DTCs are indicated at the same time, there may be an open or short to body ground in the S5V circuit.

DTC Description DTC
B1234 A short in the air mix control motor circuit (driver's)  

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
    B1234 A short in the air mix control motor circuit (driver's)  

    Is DTC B1234, Error on the DTC screen B-A2 (climate control panel without display), or DTC screen 41 (climate control panel with display) indicated?

    YES 

    The failure is duplicated. Go to step 2.

    NO: Without dual zone climate control

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

    NO: With dual zone climate control

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

  2. Determine possible failure area (S5V line, others)

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

    -2. Disconnect the following connector.

    Air mix control motor 5P connector (without dual zone climate control)
    Driver's air mix control motor 5P connector (with dual zone climate control)

    -3. Turn the vehicle to the ON mode.

    -4. Measure the voltage between test points 1 and 2.

    Without dual zone climate control 

    Test condition Vehicle ON mode
    Air mix control motor 5P connector: disconnected
    Test point 1 Air mix control motor 5P connector (female terminals) No. 3:
    Test point 2 Body ground

    With dual zone climate control 

    Test condition Vehicle ON mode
    Driver's air mix control motor 5P connector: disconnected
    Test point 1 Driver's air mix control motor 5P connector (female terminals) No. 1:
    Test point 2 Body ground
    GHH379406Courtesy of HONDA, U.S.A., INC.

    Is there about 5 V?

    YES: Without dual zone climate control

    The S5V wire is OK. Go to step 3.

    YES: With dual zone climate control

    The S5V wire is OK. Go to step 4.

    NO 

    Go to step 8.

  3. Determine possible failure area (air mix control motor, AMD-P-DR 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 (female terminals) No. 2:
    Test point 2 Body ground
    GHH379408Courtesy of HONDA, U.S.A., INC.

    Is there about 5 V?

    YES 

    Replace the air mix control motor .

    NO 

    Go to step 5.

  4. Determine possible failure area (driver's air mix control motor, AMD-P-DR line)

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

    Test condition Vehicle ON mode
    Driver's air mix control motor 5P connector: disconnected
    Test point 1 Driver's air mix control motor 5P connector (female terminals) No. 2:
    Test point 2 Body ground
    GHH379410Courtesy of HONDA, U.S.A., INC.

    Is there about 5 V?

    YES 

    Replace the driver's air mix control motor .

    NO 

    Go to step 5.

  5. Shorted wire check (AMD-P-DR line)

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

    -2. Disconnect the following connector.

    Climate control unit connector B (24P)

    -3. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
    Climate control unit connector B (24P): disconnected
    Air mix control motor 5P connector (without dual zone climate control): disconnected
    Driver's air mix control motor 5P connector (with dual zone climate control): disconnected
    Test point 1 Climate control unit connector B (24P) No. 2
    Test point 2 Body ground

    Is there 1 MΩ or more?

    YES: Without dual zone climate control

    The AMD-P-DR wire is not shorted to body ground. Go to step 6.

    YES: With dual zone climate control

    The AMD-P-DR wire is not shorted to body ground. Go to step 7.

    NO 

    Repair a short to ground in the AMD-P-DR wire.

  6. Shorted wire check (AMD-P-DR line to SENS-COM line)

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

    Test condition Vehicle OFF (LOCK) mode
    Climate control unit connector B (24P): disconnected
    Air mix control motor 5P connector (without dual zone climate control): disconnected
    Driver's air mix control motor 5P connector (with dual zone climate control): disconnected
    Test point 1 Air mix control motor 5P connector (female terminals) No. 1:
    Test point 2 Air mix control motor 5P connector (female terminals) No. 2:
    GHH379413Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    Replace the climate control unit .

    NO 

    Repair a short in the AMD-P-DR wire to SENS-COM wire.

  7. Shorted wire check (AMD-P-DR line to SENS-COM line)

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

    Test condition Vehicle OFF (LOCK) mode
    Climate control unit connector B (24P): disconnected
    Air mix control motor 5P connector (without dual zone climate control): disconnected
    Driver's air mix control motor 5P connector (with dual zone climate control): disconnected
    Test point 1 Driver's air mix control motor 5P connector (female terminals) No. 1:
    Test point 2 Driver's air mix control motor 5P connector (female terminals) No. 2:
    GHH379416Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    Replace the climate control unit .

    NO 

    Repair a short in the AMD-P-DR wire to SENS-COM wire.

  8. Open wire check (S5V line)

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

    Test condition Vehicle ON mode
    Air mix control motor 5P connector (without dual zone climate control): disconnected
    Driver's air mix control motor 5P connector (with dual zone climate control): disconnected
    Test point 1 Climate control unit connector B (24P) No. 1
    Test point 2 Body ground

    Is there about 5 V?

    YES 

    Repair an open in the S5V wire.

    NO 

    Go to step 9.

  9. Shorted wire check (S5V line)

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

    -2. Disconnect the following connector.

    Climate control unit connector B (24P)

    -3. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
    Climate control unit connector B (24P): disconnected
    Air mix control motor 5P connector (without dual zone climate control): disconnected
    Driver's air mix control motor 5P connector (with dual zone climate control): disconnected
    Test point 1 Climate control unit connector B (24P) No. 1
    Test point 2 Body ground

    Is there 1 MΩ or more?

    YES 

    Replace the climate control unit .

    NO 

    Repair a short to ground in the S5V wire.

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