LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2020 >> Fit EX >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Security System & Keyless Entry System - Testing & Troubleshooting >> Troubleshooting >> Keyless Access System Touch Sensor Circuit Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Keyless Access System Touch Sensor Circuit Troubleshooting

  1. - 1. Turn the vehicle to the ON mode.

    - 2. Connect the HDS to the data link connector (DLC) - Refer to: How To Troubleshoot The Fuel And Emissions Systems or How to Troubleshoot the CVT System (CVT) .

    - 3. Select KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter HISTORY DATA.

    One-Push - KEYLESS ACCESS CONTROL UNIT- HISTORY DATA

    - 4. Select HISTORY CLEAR, and back to TEST mode menu:

    NOTE:  When the freeze data is cleared, the information indicates "NOT CONFIRMED".

    • DRIVER DOOR UNLOCK SWITCH
    • DRIVER DOOR LOCK SWITCH
    • FRONT PASSENGER DOOR UNLOCK SWITCH
    • FRONT PASSENGER DOOR LOCK SWITCH

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

    - 6. Get out of the vehicle with the keyless remote, and touch the driver's or front passenger's door outer handle touch sensor and push the lock button.

    - 7. Select KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter HISTORY DATA.

    One-Push - KEYLESS ACCESS CONTROL UNIT- HISTORY DATA

    - 8. Recheck HISTORY DATA.

    • DRIVER DOOR UNLOCK SWITCH
    • DRIVER DOOR LOCK SWITCH
    • FRONT PASSENGER DOOR UNLOCK SWITCH
    • FRONT PASSENGER DOOR LOCK SWITCH

    Is all the information OK?

    YES 

    The system is OK at this time.

    NO 

    Go to step 2.

  2. Open wire check (GND lines):

    - 1. Disconnect the following connectors.

    Driver's door outer handle 8P connector
    Front passenger's door outer handle 8P connector

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

    Driver's door 

    Test condition Vehicle OFF (LOCK) mode.
    Driver's door outer handle 8P connector: disconnected.
    Test point 1 Driver's door outer handle 8P connector No. 8
    Test point 2 Body ground
    GHH83042Courtesy of HONDA, U.S.A., INC.

    Front passenger's door 

    Test condition Vehicle OFF (LOCK) mode.
    Front passenger's door outer handle 8P connector: disconnected.
    Test point 1 Front passenger's door outer handle 8P connector No. 8
    Test point 2 Body ground
    GHH83043Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The GND wire is OK. Go to step 3.

    NO 

    Repair an open or high resistance in the ground wire or poor ground (G401, G403).

  3. Determine possible failure area (TS FR line, VOUT FR lines):

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

    Driver's door 

    Test condition Vehicle OFF (LOCK) mode.
    Driver's door outer handle 8P connector: disconnected.
    Test point 1 Driver's door outer handle 8P connector No. 4
    Test point 2 Body ground
    GHH83044Courtesy of HONDA, U.S.A., INC.

    Front passenger's door 

    Test condition Vehicle OFF (LOCK) mode.
    Front passenger's door outer handle 8P connector: disconnected.
    Test point 1 Front passenger's door outer handle 8P connector No. 4
    Test point 2 Body ground
    GHH83045Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 4.

    NO 

    Go to step 7.

  4. Open wire check (TS FR DR, TS FR AS lines):

    - 1. Disconnect the following connector.

    Keyless access control unit connector C (20P)

    - 2. Connect terminals A and B with jumper wires.

    Driver's door 

    Terminal A Driver's door outer handle 8P connector No. 3
    Terminal B Body ground
    GHH83046Courtesy of HONDA, U.S.A., INC.

    Front passenger's door 

    Terminal A Front passenger's door outer handle 8P connector No. 3
    Terminal B Body ground
    GHH83047Courtesy of HONDA, U.S.A., INC.

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

    Test condition Vehicle OFF (LOCK) mode.
    Driver's door outer handle 8P connector: disconnected.
    Driver's door outer handle 8P connector: jumped to body ground.
    Front passenger's door outer handle 8P connector: disconnected.
    Front passenger's door outer handle 8P connector: jumped to body ground.
    Keyless access control unit connector C (20P): disconnected.
    Test point 1 Keyless access control unit connector C (20P) No. 15 
    Test point 2 Body ground
    Test point 1 Keyless access control unit connector C (20P) No. 17 
    Test point 2 Body ground

    Is there continuity4

    YES 

    The TS FR DR and TS FR AS wires are not open. Go to step 5.

    NO 

    Repair an open or high resistance in the wire (s).

  5. Shorted wire check (TS FR DR, TS FR AS lines):

    - 1. Remove the jumper wire from the touch sensor.

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

    Test condition Vehicle OFF (LOCK) mode.
    Driver's door outer handle 8P connector: disconnected.
    Front passenger's door outer handle 8P connector: disconnected.
    Keyless access control unit connector C (20P): disconnected.
    Test point 1 Keyless access control unit connector C (20P) No. 15 
    Test point 2 Body ground
    Test point 1 Keyless access control unit connector C (20P) No. 17 
    Test point 2 Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the wire (s).

    NO 

    The TS FR DR and TS FR AS wires are OK. Go to step 6.

  6. Keyless access system check 2:

    - 1. Substitute a known-good touch sensor , and recheck.

    Is the system OK?

    YES 

    Faulty the original door touch sensor/lock switch; replace the door outer handle .

    NO 

    Replace the keyless access control unit .

  7. Open wire check (VOUT FR DR, VOUT FR AS lines):

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

    Test condition Vehicle OFF (LOCK) mode.
    Driver's door outer handle 8P connector: disconnected.
    Front passenger's door outer handle 8P connector: disconnected.
    Test point 1 Keyless access control unit connector A (32P) No. 19 
    Test point 2 Body ground
    Test point 1 Keyless access control unit connector A (32P) No. 21 
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    Repair an open or high resistance in the wire (s).

    NO 

    The VOUT FR DR and VOUT FR AS wires are OK. Replace the keyless access control unit .

scientia non olet · About LEMON Manuals