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
There may be a malfunction in one of the followings; the wiring harness or its connector(s)
between the electric tailgate control unit and the half latch switch, the wiring harness or
its connector(s) between the electric tailgate control unit and the full latch switch, the tailgate
latch switch itself or the electric tailgate control unit itself.
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?
All are normal. : Go to Step 9.
Normal condition is not displayed for items 5 and 6. : Go to Step 2.
Normal condition is not displayed for item No. 5. : Go to Step 5.
Normal condition is not displayed for item No. 6. : Go to Step 7.
STEP 2. Half-latch and full-latch switches check
Check the tailgate latch (refer to ).
Q.
Is the check result normal?
Go to Step 3.
Replace the tailgate latch.
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?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction .)
Go to Step 4.
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?
Go to Step 9.
Repair the connector(s) or wiring harness.
STEP 5. Half-latch switch check
Check the tailgate latch (refer to ).
Q.
Is the check result normal?
Go to Step 6.
Replace the tailgate latch.
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?
Go to Step 9.
Repair the connector(s) or wiring harness.
STEP 7. Full-latch switch check
Check the tailgate latch (refer to ).
Q.
Is the check result normal?
Go to Step 8.
Replace the tailgate latch.
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?
Go to Step 9.
Repair the connector(s) or wiring harness.
STEP 9. System retest
Check whether the half latch switch and/or the full latch switch signal are received
normally.
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction .)
Go to Step 10.
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.
).
Go to Step 3.
Replace the tailgate latch.