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HOMESERVICE MANUALSACURA2015RLXREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMESEATSPOWER SEAT SYSTEM - DIAGNOSTICS (EXCEPT HYBRID)TROUBLESHOOTINGDTC B1826
2015 Acura RLX

DTC B1826

2015 Acura RLXSECTION DTC B1826

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

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

DTC (Power Seat Control Unit)

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. D15 (20 A) fuse in the driver's under-dash fuse/relay box. If the fuse blows again, check for a short to ground in the front up-down motor circuit.
  1. Problem verification

    -1. Clear the DTCs with the HDS.

    -2. Operate the power seat to its highest and then to its lowest position. (Two times)

    -3. Check for DTCs with the HDS.

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

    Is DTC B1826 indicated?

    DTC B1826 is indicated

    Go to step 2.

    DTC B1836 is also indicated

    Go to the DTC B1836 troubleshooting.

    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 (FHSE, 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 circuit FHSE
    Test point 1 Front up-down motor/position sensor 6P connector No. 1 (PNK)
    Test point 2 Power seat control unit connector A (20P) No. 7 (PNK)
    Test circuit SEG
    Test point 1 Front up-down motor/position sensor 6P connector No. 2 (WHT)
    Test point 2 Power seat control unit connector A (20P) No. 19 (WHT)
    GHH349894Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

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

    NO 

    Repair an open or high resistance in the wire.

  4. Shorted wire check (FHSE 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 circuit FHSE
    Test point 1 Power seat control unit connector A (20P) No. 7 (PNK)
    Test point 2 Body ground
    GHH349895Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short to ground in the wire.

    NO 

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

  5. Front up-down position sensor check

    -1. Reconnect 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 circuit FHSE, SEG
    Test point 1 Front up-down motor/position sensor 6P connector No. 1 (PNK) (+)
    Test point 2 Front up-down motor/position sensor 6P connector No. 2 (WHT) (-)
    GHH349896Courtesy 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 circuit SVCC
    Test point 1 Front up-down motor/position sensor 6P connector No. 3 (PUR)
    Test point 2 Power seat control unit connector A (20P) No. 6 (PUR)
    Test circuit SEG
    Test point 1 Front up-down motor/position sensor 6P connector No. 2 (WHT)
    Test point 2 Power seat control unit connector A (20P) No. 19 (WHT)
    GHH349897Courtesy 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 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 circuit SVCC, SEG
    Test point 1 Power seat control unit connector A (20P) No. 6 (PUR)
    Test point 2 Power seat control unit connector A (20P) No. 19 (WHT)
    GHH349898Courtesy of HONDA, U.S.A., INC.

    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. Check the following fuse.

    Fuse No. D15 (20 A)
    Location Driver's under-dash fuse/relay box

    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. D15 (20 A) fuse circuit.

  9. Open wire check (+B DR P/SEAT SLIDE/VMP1 line)

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

    Test condition Vehicle OFF (LOCK) mode
    Test circuit VMP1
    Test point 1 Power seat control unit connector B (12P) No. 6 (BLU)
    Test point 2 Body ground
    GHH349899Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B DR P/SEAT SLIDE/VMP1 wire is not open. Go to step 10.

    NO 

    Repair an open or high resistance in the wire.

  10. Open wire check (GND1 line)

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

    Test condition Vehicle OFF (LOCK) mode
    Test circuit GND1
    Test point 1 Power seat control unit connector B (12P) No. 2 (BLU)
    Test point 2 Body ground
    GHH349900Courtesy of HONDA, U.S.A., INC.

    Is there 0.2 V or more?

    YES 

    Repair an open or high resistance in the ground wire or poor ground (G801).

    NO 

    The GND1 wire is not open. Go to step 11.

  11. Open wire check (FR HEIGHT UP, FR HEIGHT 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 circuit FR HEIGHT UP
    Test point 1 Front up-down motor/position sensor 6P connector No. 6 (ORN)
    Test point 2 Power seat control unit connector B (12P) No. 10 (ORN)
    Test circuit FR HEIGHT DOWN
    Test point 1 Front up-down motor/position sensor 6P connector No. 4 (YEL)
    Test point 2 Power seat control unit connector B (12P) No. 7 (YEL)
    GHH349901Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

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

    NO 

    Repair an open or high resistance in the wire.

  12. Shorted wire check (FR HEIGHT MTR UP, FR HEIGHT MTR 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 circuit FR HEIGHT UP
    Test point 1 Front up-down motor/position sensor 6P connector No. 6 (ORN)
    Test point 2 Body ground
    Test circuit FR HEIGHT DOWN
    Test point 1 Front up-down motor/position sensor 6P connector No. 4 (YEL)
    Test point 2 Body ground
    GHH349902Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short to ground in the wire.

    NO 

    The FR HEIGHT UP and FR HEIGHT 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 .

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.