Inspection Procedure B-6: Half latch switch and/or full latch switch signals are not received.


caution Before replacing the ECU, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Damaged tailgate latch
  • Damaged electric tailgate control unit
  • Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list


(1)Disconnect the negative battery terminal and wait for approximately 30 seconds.
(2)Check the signals related to the electric tailgate operation.

  • Half latch switch: OFF → ON
  • Full latch switch: OFF → ON
Item No.
 Item name
 Normal conditions
Item 5
 Half latch switch
 OFF → ON
Item 6
 Full latch switch
 OFF → ON
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?









STEP 2. Half-latch and full-latch switches check



Q. Is the check result normal?





STEP 3. Resistance measurement at tailgate latch connector (half-latch switch/full latch switch earth line terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between tailgate latch connector (half-latch switch/full latch switch earth line terminal) and body earth.
OK: Continuity exists (2 Ω or less).

Q. Is the check result normal?





STEP 4. Check of open circuit in earth line between tailgate latch connector (half-latch switch/full latch switch terminal) and body earth.


Q. Is the check result normal?





STEP 5. Half-latch switch check



Q. Is the check result normal?





STEP 6. Check of open circuit in HARF line between electric tailgate control unit connector and tailgate latch connector.


Q. Is the check result normal?





STEP 7. Full-latch switch check



Q. Is the check result normal?





STEP 8. Check of open circuit in FULL line between electric tailgate control unit connector and tailgate latch connector.


Q. Is the check result normal?





STEP 9. System retest



Q. Is the check result normal?





STEP 10. After the replacement of tailgate latch, recheck the trouble symptom.


(1)Replace the tailgate latch.
(2)Check whether the half latch switch and/or the full latch switch signal are received normally.

Q. Is the check result normal?