Part One

Keyless/Power Door Locks/Security System Symptom Troubleshooting - Auto door unlock does not work

AUTO DOOR UNLOCK does not work

NOTE:
* Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.
* Before testing, check the No. B8 (15 A), No. B9 (15 A), No. B15 (15 A), No. B30 (15 A), No. B32 (15 A), No. B33 (15 A), and No. B41 (20 A) fuses in the under-dash fuse/relay box.
* There are two pairs of fuses in the same circuit (No. B8 and No. B32 fuses, No. B9 and No. B33 fuses, No. B15 and No. B30 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. Abnormal circuit check 1:

Abnormal circuit check 1
-1. Connect the HDS to the data link connector (DLC) How To Troubleshoot The Fuel And Emissions Systems.

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

-3. Select UNLOCK ALL DOORS with the HDS.

Do the door lock actuators work normally?
-YES- Go to step 26.
-NO- Driver's door lock circuit: go to step 2.
-NO- Front passenger's door lock circuit: go to step 8.
-NO- Left rear door lock circuit: go to step 14.
-NO- Right rear door lock circuit: go to step 20.

2. Open wire check (+B_F/BOX_MAIN line):

Open wire check (+B_F/BOX_MAIN line)
-1. Measure the voltage between test points 1 and 2 individually.









Is there battery voltage?
-YES- Go to step 3.
-NO- Repair an open or high resistance in the wire.

3. Open wire check (GND line) 1:

Open wire check (GND line) 1
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 4.
-NO- Repair an open or high resistance in the ground wire or poor ground (G502).

4. Open wire check (GND line) 2:

Open wire check (GND line) 2
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 5.
-NO- Repair an open or high resistance in the ground wire or poor ground (G502).

5. Determine possible failure area (door latch, others):

Determine possible failure area (door latch, others)
-1. Disconnect the following connector.





-2. Test the door lock actuator Front Door Lock Actuator Test (4-door).

Is the door lock actuator OK?
-YES- Go to step 6.
-NO- Faulty door lock actuator, replace the door latch Front Door Latch Removal and Installation (4-door).

6. Open wire check (DR_DOOR_UNLOCK line):

Open wire check (DR_DOOR_ UNLOCK line)
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 7.
-NO- Repair an open or high resistance in the wire.

7. Open wire check (DR_DOOR_LOCK line):

Open wire check (DR_DOOR_LOCK line)
-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Faulty MICU, replace the under-dash fuse/relay box Service and Repair.
-NO- Repair an open or high resistance in the wire.

8. Open wire check (+B_F/BOX_MAIN line):

Open wire check (+B_F/BOX_MAIN line)
-1. Measure the voltage between test points 1 and 2 individually.









Is there battery voltage?
-YES- Go to step 9.
-NO- Repair an open or high resistance in the wire.

9. Open wire check (GND line) 1:

Open wire check (GND line) 1
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 10.
-NO- Repair an open or high resistance in the ground wire or poor ground (G502).

10. Open wire check (GND line) 2:

Open wire check (GND line) 2
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 11.
-NO- Repair an open or high resistance in the ground wire or poor ground (G502).

11. Determine possible failure area (door latch, others):

Determine possible failure area (door latch, others)
-1. Disconnect the following connector.





-2. Test the door lock actuator Front Door Lock Actuator Test (4-door).

Is the door lock actuator OK?
-YES- Go to step 12.
-NO- Faulty door lock actuator, replace the door latch Front Door Latch Removal and Installation (4-door).

12. Open wire check (R_SIDE_DOOR_UNLOCK line):

Open wire check (R_SIDE_DOOR_ UNLOCK line)
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 13.
-NO- Repair an open or high resistance in the wire.

13. Open wire check (R_SIDE_DOOR_LOCK line):

Open wire check (R_SIDE_DOOR_LOCK line)
-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Faulty MICU, replace the under-dash fuse/relay box Service and Repair.
-NO- Repair an open or high resistance in the wire.

14. Open wire check (+B_F/BOX_MAIN line):

Open wire check (+B_F/BOX_MAIN line)
-1. Measure the voltage between test points 1 and 2 individually.









Is there battery voltage?
-YES- Go to step 15.
-NO- Repair an open or high resistance in the wire.

15. Open wire check (GND line) 1:

Open wire check (GND line) 1
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 16.
-NO- Repair an open or high resistance in the ground wire or poor ground (G502).

16. Open wire check (GND line) 2:

Open wire check (GND line) 2
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 17.
-NO- Repair an open or high resistance in the ground wire or poor ground (G502).

17. Determine possible failure area (door latch, others):

Determine possible failure area (door latch, others)
-1. Disconnect the following the connector.





-2. Test the door lock actuator Rear Door Lock Actuator Test (4-door).

Is the door lock actuator OK?
-YES- Go to step 18.
-NO- Faulty door lock actuator, replace the door latch Service and Repair.

18. Open wire check (L_SIDE_DOOR_ UNLOCK line):

Open wire check (L_SIDE_DOOR_ UNLOCK line)
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 19.
-NO- Repair an open or high resistance in the wire.

19. Open wire check (L_SIDE_DOOR_LOCK line):

Open wire check (L_SIDE_DOOR_LOCK line)
-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Faulty MICU, replace the under-dash fuse/relay box Service and Repair.
-NO- Repair an open or high resistance in the wire.

20. Open wire check (+B_F/BOX_MAIN line):

Open wire check (+B_F/BOX_MAIN line)
-1. Measure the voltage between test points 1 and 2 individually.









Is there battery voltage?
-YES- Go to step 21.
-NO- Repair an open or high resistance in the wire.

21. Open wire check (GND line) 1:

Open wire check (GND line) 1
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 22.
-NO- Repair an open or high resistance in the ground wire or poor ground (G502).

22. Open wire check (GND line) 2:

Open wire check (GND line) 2
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 23.
-NO- Repair an open or high resistance in the ground wire or poor ground (G502).

23. Determine possible failure area (door latch, others):

Determine possible failure area (door latch, others)
-1. Disconnect the following connector.





-2. Test the door lock actuator Rear Door Lock Actuator Test (4-door).

Is the door lock actuator OK?
-YES- Go to step 24.
-NO- Faulty door lock actuator, replace the door latch Service and Repair.

24. Open wire check (R_SIDE_DOOR_UNLOCK line):

Open wire check (R_SIDE_DOOR_ UNLOCK line)
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Go to step 25.
-NO- Repair an open or high resistance in the wire.

25. Open wire check (R_SIDE_DOOR_LOCK line):

Open wire check (R_SIDE_DOOR_LOCK line)
-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Faulty MICU, replace the under-dash fuse/relay box Service and Repair.
-NO- Repair an open or high resistance in the wire.

26. Abnormal circuit check 2:

Abnormal circuit check 2
-1. Select DOOR LOCKS from the BODY ELECTRICAL menu, and enter the DATA LIST with the HDS.

-2. Check the ON/OFF information in the DATA LIST when each switch is operating.
* A/T GEAR POSITION SWITCH (P)
* DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK)
* FRONT PASSENGER'S DOOR LOCK KNOB SW (UNLOCK)
* DRIVER'S REAR DOOR LOCK KNOB SW (UNLOCK)
* PASSENGER'S REAR DOOR LOCK KNOB SW (UNLOCK)

Is each switch information OK?
-YES- Faulty MICU, replace the under-dash fuse/relay box Service and Repair.
-NO- Transmission range switch P position circuit troubleshooting: go to step 27.
-NO- Driver's door lock knob switch circuit troubleshooting: go to step 33.
-NO- Front passenger's door lock knob switch circuit troubleshooting: go to step 39.
-NO- Left rear door lock knob switch circuit troubleshooting: go to step 45.
-NO- Right rear door lock knob switch circuit troubleshooting: go to step 51.

27. Keyless/power door locks/security system check 1:

Keyless/power door locks/security system check 1
-1. With the transmission range switch in P position, select DOOR LOCKS with the HDS, and enter the DATA LIST.

-2. Check the ON/OFF information of the A/T GEAR POSITION SWITCH (P) in the DATA LIST.

Is information indicator ON?
-YES- Go to step 28.
-NO- Go to step 30.

28. Determine possible failure area (transmission range switch, others):

Determine possible failure area (transmission range switch, others)
-1. Disconnect the transmission range switch 10P connector.

-2. Check the ON/OFF information of the A/T GEAR POSITION SWITCH (P) in the DATA LIST.

Is information indicator OFF?
-YES- Replace the transmission range switch .
-NO- Go to step 29.

29. Shorted wire check (ATP-P line):

Shorted wire check (ATP-P line)
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Repair a short to ground in the wire.
-NO- Faulty MICU, replace the under-dash fuse/relay box Service and Repair.

30. Keyless/power door locks/security system check 2:

Keyless/power door locks/security system check 2
-1. Disconnect the following connector.





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









-3. Check the ON/OFF information of the A/T GEAR POSITION SWITCH (P) in the DATA LIST.

Is information indicator ON?
-YES- Go to step 31.
-NO- Go to step 32.

31. Open wire check (GND line):

Open wire check (GND line)
-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Replace the transmission range switch .
-NO- Repair an open or high resistance in the ground wire or poor ground (G101).