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DTC B1826

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DTC B1826  : Front Height Pulse Error (No Change in Pulse for 1 Second)

NOTE:
  • If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
  • If DTC B1825 and B1826 are both indicated, check for a blown No. B33 fuse . If the fuse blows again, check for a short to ground in the front up-down motor circuit.
DTC Description DTC
B1826 Front height pulse error (no change in pulse for 1 second)  

DTC (Power Seat Control Unit)

  1. Problem verification

    -1. Clear the DTCs with the HDS.

    -2. Press the engine start/stop button at least 20 times, then wait for at least 20 seconds.

    -3. Operate the power seat to its most up and then to its most down position.

    NOTE: DTC B1826 is stored when the front up-down switch is operated more than 1 second after the seat moves to the most up or down position, even when the system is OK.

    -4. Check for DTCs with the HDS.

    DTC Description DTC
    B1825 Slide pulse error (no change in pulse for 1 second)  
    B1826 Front height pulse error (no change in pulse for 1 second)  
    B1827 Rear height pulse error (no change in pulse for 1 second)  
    B1828 Driver seat recline motor pulse error  
    B1836 Power seat position sensor circuit short  

    Any of DTC are indicated at the same time with DTC B1826?

    YES: DTC B1826 is indicated only 

    Go to step 2.

    YES: DTC B1836 is also indicated 

    Go to DTC B1836 troubleshooting .

    YES: DTC B1825, B1827, and/or B1828 are also indicated 

    Go to step 6.

    NO 

    Intermittent failure, the system is OK at this time. Check for loose or poor connections.

  2. Determine possible failure area (motor operation, motor sensor)

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

    -2. Operate the front up-down switch for 2 seconds, and check the front up-down motor operation.

    Does the front up-down motor run smoothly?

    YES 

    Go to step 3.

    NO 

    Go to step 8.

  3. Open wire check (TISE, SEG lines)

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

    -2. Disconnect the following connectors.

    Front up-down motor/position sensor 6P connector
    Power seat control unit connector A (20P)

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

    Test condition Vehicle OFF (LOCK) mode
    Front up-down motor/position sensor 6P connector: disconnected
    Power seat control unit connector A (20P): disconnected
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 1:
    Test point 2 Power seat control unit connector A (20P) No. 7
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 2:
    Test point 2 Power seat control unit connector A (20P) No. 19
    GHH397552Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The TISE, SEG wires are not open. Go to step 4.

    NO 

    Repair an open or high resistance in the wire.

  4. Shorted wire check (TISE line)

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

    Test condition Vehicle OFF (LOCK) mode
    Front up-down motor/position sensor 6P connector: disconnected
    Power seat control unit connector A (20P): disconnected
    Test point 1 Power seat control unit connector A (20P) No. 7
    Test point 2 Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the wire.

    NO 

    The TISE wire is not shorted. Go to step 5.

  5. Front up-down position sensor check

    -1. Reconnect the following connector.

    Power seat control unit connector A (20P)

    -2. Turn the vehicle to the ON mode.

    -3. Measure the voltage between test points 1 (+) and 2 (-).

    Test condition Vehicle ON mode
    Front up-down motor/position sensor 6P connector: disconnected
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 1 (+):
    Test point 2 Front up-down motor/position sensor 6P connector (female terminals) No. 2 (-):
    GHH397555Courtesy of HONDA, U.S.A., INC.

    Is there about 5 V?

    About 5 V

    Faulty front up-down motor/position sensor; replace the seat frame assembly .

    No voltage

    Replace the power seat control unit .

    Battery voltage

    Repair a short to power in the wire (sensor line).

  6. Open wire check (SVCC, SEG lines)

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

    -2. Disconnect the following connectors.

    Front up-down motor/position sensor 6P connector
    Power seat control unit connector A (20P)

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

    Test condition Vehicle OFF (LOCK) mode
    Front up-down motor/position sensor 6P connector: disconnected
    Power seat control unit connector A (20P): disconnected
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 3:
    Test point 2 Power seat control unit connector A (20P) No. 6
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 2:
    Test point 2 Power seat control unit connector A (20P) No. 19
    GHH397558Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The SVCC and SEG wires are OK. Go to step 7.

    NO 

    Repair an open or high resistance in the wire.

  7. Power seat control unit check

    -1. Reconnect the following connector.

    Power seat control unit connector A (20P)

    -2. Turn the vehicle to the ON mode.

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

    Test condition Vehicle ON mode
    Front up-down motor/position sensor 6P connector: disconnected
    Test point 1 Power seat control unit connector A (20P) No. 6
    Test point 2 Power seat control unit connector A (20P) No. 19

    Is there battery voltage when the front up-down switch is operated?

    YES 

    Faulty front up-down motor/position sensor; replace the seat frame assembly .

    NO 

    Replace the power seat control unit .

  8. Fuse check

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

    -2. Check the following fuse.

    Fuse No. B33

    Is the fuse OK?

    YES 

    Go to step 9.

    NO 

    Replace the fuse. If the fuse blows again, repair the short to ground in the No. B33 fuse circuit.

  9. Open wire check (+B DR P/SEAT SLIDE/+B/P-SEAT1 line)

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

    Test condition Vehicle OFF (LOCK) mode
    Test point 1 Power seat control unit connector B (12P) No. 6
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    The +B DR P/SEAT SLIDE/+B/P-SEAT1 wire is not open. Go to step 10.

    NO 

    Repair an open or high resistance in the wire.

  10. Open wire check (GND/P-SEAT1 line)

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

    Test condition Vehicle OFF (LOCK) mode
    Test point 1 Power seat control unit connector B (12P) No. 2
    Test point 2 Body ground

    Is there 0.2 V or more?

    YES 

    Repair an open or high resistance in the ground wire or poor ground (G601).

    NO 

    The GND/P-SEAT1 wire is not open. Go to step 11.

  11. Open wire check (TILT UP, TILT DOWN lines)

    -1. Disconnect the following connectors.

    Front up-down motor/position sensor 6P connector
    Power seat control unit connector B (12P)

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

    Test condition Vehicle OFF (LOCK) mode
    Front up-down motor/position sensor 6P connector: disconnected
    Power seat control unit connector B (12P): disconnected
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 6:
    Test point 2 Power seat control unit connector B (12P) No. 10
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 4:
    Test point 2 Power seat control unit connector B (12P) No. 7
    GHH397561Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The TILT UP and TILT DOWN wires are not open. Go to step 12.

    NO 

    Repair an open or high resistance in the wire.

  12. Shorted wire check (TILT UP, TILT DOWN lines)

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

    Test condition Vehicle OFF (LOCK) mode
    Front up-down motor/position sensor 6P connector: disconnected
    Power seat control unit connector B (12P): disconnected
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 6:
    Test point 2 Body ground
    Test point 1 Front up-down motor/position sensor 6P connector (female terminals) No. 4:
    Test point 2 Body ground
    GHH397564Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short to ground in the wire.

    NO 

    The TILT UP and TILT DOWN wires are OK. Go to step 13.

  13. Front up-down motor check

    -1. Test the front up-down motor .

    Is the motor OK?

    YES 

    Replace the power seat control unit .

    NO 

    Faulty front up-down motor/position sensor; replace the seat frame assembly .

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