Keyless/Power Door Locks/Security System Symptom Troubleshooting - AUTO DOOR UNLOCK does not work (2-door) (2016 2017 2018 2019 2020)

NOTE: 

• Before testing, make sure the No. A1-5 (30 A) *2, No. A2-2 (30 A) *2/(50 A) *1, and No. A18 (10 A) fuses in the under-hood fuse/relay box are OK.
• Check if Auto Door Unlock feature selected OFF, under MID customized settings for each remote transmitter: Driver 1 and 2. Make sure to test operation of each Auto Door Unlock setting to check function.
• Before testing, make sure the No. B9 (10 A), No. B11 (5 A), No. B12 (10 A), No. B15 (20 A), No. B16 (20 A), No. B25 (10 A), No. B26 (10 A), No. B28 (20 A), and No. B39 (10 A) fuses in the under-dash fuse/relay box are OK.
• There are two pairs of fuses in the same circuit (No. B25 and No. B39 fuses, No. B12 and No. B26 fuses). If one fuse is blown, make sure to check the other fuse in the same circuit. If necessary, replace the blown fuse(s).

  *1: Without keyless access system

  *2: With keyless access system

1. Abnormal circuit check 1

   -1. Connect the HDS to the data link connector (DLC) .

   -2. Select DOOR LOCKS from the BODY ELECTRICAL SYSTEM SELECT menu with the HDS, and enter FUNCTIONAL TESTS.

   BODY ELECTRICAL - DOOR LOCKS - Functional Tests - Inspection

   Select UNLOCK ALL DOORS with the HDS.

   Do the door lock actuators work normally?

   YES 

   Go to step 14.

   NO 

   Driver's door lock circuit: go to step 2.

   NO 

   Passenger's door lock circuit: go to step 8.

2. Open wire check (+B F/BOX MAIN2 line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   Test point 1	Under-dash fuse/relay box connector C (27P) No. 3
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The +B F/BOX MAIN2 wire is OK. Go to step 3.

   NO 

   Repair an open or high resistance in the wire.

3. Open wire check (GND line)

   -1. Disconnect the following connector.

   Under-dash fuse/relay box connector E (18P)

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

   Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector E (18P): disconnected
   Test point 1	Under-dash fuse/relay box connector E (18P) No. 2
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 4.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G501).

4. Determine possible failure area (driver's door lock actuator, others)

   -1. Disconnect the following connector.

   Driver's door latch 10P connector

   -2. Test the door lock actuator .

   Is the door lock actuator OK?

   YES 

   Go to step 5.

   NO 

   Faulty door lock actuator; replace the driver's door latch .

5. Open wire check (DR DOOR UNLOCK line)

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

   Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector E (18P): disconnected Driver's door latch 10P connector: disconnected
   Test point 1	Under-dash fuse/relay box connector E (18P) No. 16
   Test point 2	Driver's door latch 10P connector No. 1

   Courtesy of HONDA, U.S.A., INC.

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The DR DOOR UNLOCK wire is OK. Go to step 6.

   NO 

   Repair an open or high resistance in the wire.

6. Open wire check (DR DOOR LOCK line)

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

   Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector E (18P): disconnected Driver's door latch 10P connector: disconnected
   Test point 1	Under-dash fuse/relay box connector E (18P) No. 15
   Test point 2	Driver's door latch 10P connector No. 4

   Courtesy of HONDA, U.S.A., INC.

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The DR DOOR LOCK wire is OK. Go to step 7.

   NO 

   Repair an open or high resistance in the wire.

7. Open wire check (DR DOOR UNLOCK RELAY CL- line)

   -1. Disconnect the following connectors.

   Body control module connector B (36P) Under-dash fuse/relay box connector G (20P)

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

   Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector E (18P): disconnected Under-dash fuse/relay box connector G (20P): disconnected Body control module connector B (36P): disconnected Driver's door latch 10P connector: disconnected
   Test point 1	Body control module connector B (36P) No. 31
   Test point 2	Under-dash fuse/relay box connector G (20P) No. 8 *1 Under-dash fuse/relay box connector G (20P) No. 9 *2

   *1: Without keyless access system

   *2: With keyless access system

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The DR DOOR UNLOCK RELAY CL- wire is OK. Replace the body control module .

   NO 

   Repair an open or high resistance in the wire.

8. Open wire check (+B F/BOX MAIN2 line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   Test point 1	Under-dash fuse/relay box connector C (27P) No. 3
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The +B F/BOX MAIN2 wire is OK. Go to step 9.

   NO 

   Repair an open or high resistance in the wire.

9. Open wire check (GND line)

   -1. Disconnect the following connector.

   Under-dash fuse/relay box connector E (18P)

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

   Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector E (18P): disconnected
   Test point 1	Under-dash fuse/relay box connector E (18P) No. 2
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 10.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G501).

10. Determine possible failure area (passenger's door lock actuator, others)

    -1. Disconnect the following connector.

    Passenger's door latch 10P connector

    -2. Test the door lock actuator .

    Is the door lock actuator OK?

    YES 

    Go to step 11.

    NO 

    Faulty door lock actuator; replace the passenger's door latch .

11. Open wire check (R SIDE DOOR UNLOCK line)

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

    Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector E (18P): disconnected Passenger's door latch 10P connector: disconnected
    Test point 1	Under-dash fuse/relay box connector E (18P) No. 9
    Test point 2	Passenger's door latch 10P connector No. 1

    Courtesy of HONDA, U.S.A., INC.

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The R SIDE DOOR UNLOCK wire is OK. Go to step 12.

    NO 

    Repair an open or high resistance in the wire.

12. Open wire check (R SIDE DOOR LOCK line)

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

    Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector E (18P): disconnected Passenger's door latch 10P connector: disconnected
    Test point 1	Under-dash fuse/relay box connector E (18P) No. 18
    Test point 2	Passenger's door latch 10P connector No. 4

    Courtesy of HONDA, U.S.A., INC.

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The R SIDE DOOR LOCK wire is OK. Go to step 13.

    NO 

    Repair an open or high resistance in the wire.

13. Open wire check (DOOR UNLOCK RELAY CL- line)

    -1. Disconnect the following connectors.

    Body control module connector B (36P) Under-dash fuse/relay box connector F (12P)

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

    Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector E (18P): disconnected Under-dash fuse/relay box connector F (12P): disconnected Body control module connector B (36P): disconnected Passenger's door latch 10P connector: disconnected
    Test point 1	Body control module connector B (36P) No. 32
    Test point 2	Under-dash fuse/relay box connector F (12P) No. 5

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The DOOR UNLOCK RELAY CL- wire is OK. Replace the body control module .

    NO 

    Repair an open or high resistance in the wire.

14. Abnormal circuit check 2

    -1. Check the parameter(s) below with the HDS when each switch is operating.

    Door Multiplex Control Unit 

    Signal	Current conditions
    	Value	Unit
    Driver's Door Lock Knob Switch (UNLOCK)
    Passenger's Door Lock Knob Switch (UNLOCK)

    Body Control Module 

    Signal	Current conditions
    	Value	Unit
    Driver's Door Switch

    Is each switch information OK?

    YES 

    Replace the body control module .

    NO 

    Driver's door switch circuit troubleshooting: go to step 15.

    NO 

    Driver's door lock knob switch circuit troubleshooting: go to step 17.

    NO 

    Passenger's door lock knob switch circuit troubleshooting: go to step 23.

15. Driver's door switch operation check

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

    -2. Remove the driver's door switch.

    -3. Disconnect the following connector.

    Driver's door switch 1P connector

    -4. Check for continuity between test points 1 and 2.

    Test point 1	Driver's door switch 1P connector
    Test point 2	Switch ground

    Courtesy of HONDA, U.S.A., INC.

    Is there no continuity when you push the switch and is there continuity when you release the switch?

    YES 

    Go to step 16.

    NO 

    Replace the driver's door switch.

16. Shorted wire check (FL DOOR SW line)

    -1. Disconnect the following connector.

    Body control module connector D (40P)

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

    Test condition	Vehicle OFF (LOCK) mode Body control module connector D (40P): disconnected Driver's door switch 1P connector: disconnected
    Test point 1	Body control module connector D (40P) No. 22
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the wire.

    NO 

    The FL DOOR SW wire is OK. Replace the body control module .

17. Keyless/power door locks/security system check 1

    -1. With the driver's door lock knob switch in LOCK position, check the parameter(s) below with the HDS.

    Signal	Current conditions
    	Value	Unit
    Driver's Door Lock Knob Switch (UNLOCK)

    Is information value ON?

    YES 

    Go to step 18.

    NO 

    Go to step 20.

18. Determine possible failure area (driver's door lock knob switch, others)

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

    -2. Disconnect the following connector.

    Driver's door latch 10P connector

    -3. Check the parameter(s) below with the HDS.

    Signal	Current conditions
    	Value	Unit
    Driver's Door Lock Knob Switch (UNLOCK)

    Is information value OFF?

    YES 

    Faulty driver's door lock knob switch; replace the driver's door latch .

    NO 

    Go to step 19.

19. Shorted wire check (DR SILCON UNLOCK line)

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

    -2. Disconnect the following connector.

    Power window master switch 37P connector

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

    Test condition	Vehicle OFF (LOCK) mode Driver's door latch 10P connector: disconnected Power window master switch 37P connector: disconnected
    Test point 1	Power window master switch 37P connector No. 20
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the wire.

    NO 

    The DR SILCON UNLOCK wire is OK. Replace the power window master switch .

20. Keyless/power door locks/security system check 2

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

    -2. Disconnect the following connector.

    Driver's door latch 10P connector

    -3. Connect terminals A and B with a jumper wire.

    Terminal A	Driver's door latch 10P connector No. 5
    Terminal B	Body ground

    Courtesy of HONDA, U.S.A., INC.

    -4. Check the parameter(s) below with the HDS.

    Signal	Current conditions
    	Value	Unit
    Driver's Door Lock Knob Switch (UNLOCK)

    Is information value ON?

    YES 

    Go to step 21.

    NO 

    Go to step 22.

21. Open wire check (GND line)

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

    -2. Remove the jumper wire.

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

    Test condition	Vehicle OFF (LOCK) mode Driver's door latch 10P connector: disconnected
    Test point 1	Driver's door latch 10P connector No. 7
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The GND wire is OK. Faulty driver's door lock knob switch; replace the driver's door latch .

    NO 

    Repair an open or high resistance in the wire or poor ground (G501).

22. Open wire check (DR SILCON UNLOCK line)

    -1. Remove the jumper wire.

    -2. Connect terminals A and B with a jumper wire.

    Terminal A	Power window master switch 37P connector No. 20
    Terminal B	Body ground

    -3. Check the parameter(s) below with the HDS.

    Signal	Current conditions
    	Value	Unit
    Driver's Door Lock Knob Switch (UNLOCK)

    Is information value ON?

    YES 

    Repair an open or high resistance in the wire.

    NO 

    The DR SILCON UNLOCK wire is OK. Replace the power window master switch .

23. Keyless/power door locks/security system check 1

    -1. With the passenger's door lock knob switch in LOCK position, check the parameter(s) below with the HDS.

    Signal	Current conditions
    	Value	Unit
    Passenger's Door Lock Knob Switch (UNLOCK)

    Is information indicator ON?

    YES 

    Go to step 24.

    NO 

    Go to step 26.

24. Determine possible failure area (passenger's door lock knob switch, others)

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

    -2. Disconnect the following connector.

    Passenger's door latch 10P connector

    -3. Check the parameter(s) below with the HDS.

    Signal	Current conditions
    	Value	Unit
    Passenger's Door Lock Knob Switch (UNLOCK)

    Is information value OFF?

    YES 

    Faulty passenger's door lock knob switch; replace the passenger's door latch .

    NO 

    Go to step 25.

25. Shorted wire check (AS SILCON UNLOCK line)

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

    -2. Disconnect the following connector.

    Passenger's power window switch 37P connector

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

    Test condition	Vehicle OFF (LOCK) mode Passenger's door latch 10P connector: disconnected Passenger's power window switch 37P connector: disconnected
    Test point 1	Passenger's power window switch 37P connector No. 36
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the wire.

    NO 

    The AS SILCON UNLOCK wire is OK. Replace the passenger's power window switch .

26. Keyless/power door locks/security system check 2

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

    -2. Disconnect the following connector.

    Passenger's door latch 10P connector

    -3. Connect terminals A and B with a jumper wire.

    Terminal A	Passenger's door latch 10P connector No. 7
    Terminal B	Body ground

    Courtesy of HONDA, U.S.A., INC.

    -4. Check the parameter(s) below with the HDS.

    Signal	Current conditions
    	Value	Unit
    Passenger's Door Lock Knob Switch (UNLOCK)

    Is information value ON?

    YES 

    Go to step 27.

    NO 

    Go to step 28.

27. Open wire check (GND line)

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

    -2. Remove the jumper wire.

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

    Test condition	Vehicle OFF (LOCK) mode Passenger's door latch 10P connector: disconnected
    Test point 1	Passenger's door latch 10P connector No. 8
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The GND wire is OK. Faulty passenger's door lock knob switch; replace the passenger's door latch .

    NO 

    Repair an open or high resistance in the ground wire or poor ground (G505).

28. Open wire check (AS SILCON UNLOCK line)

    -1. Remove the jumper wire.

    -2. Connect terminals A and B with a jumper wire.

    Terminal A	Passenger's power window switch 37P connector No. 36
    Terminal B	Body ground

    -3. Check the parameter(s) below with the HDS.

    Signal	Current conditions
    	Value	Unit
    Passenger's Door Lock Knob Switch (UNLOCK)

    Is information value ON?

    YES 

    Repair an open or high resistance in the wire.

    NO 

    The AS SILCON UNLOCK wire is OK. Replace the passenger's power window switch .