Inspection Procedure
B-4: Door-ajar signal is not received.
caution
Before replacing the ECU,
ensure that the input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
The wiring harness or its connector(s) between the door-ajar switch and the electric tailgate
control unit, the tailgate latch itself or the electric tailgate control unit itself may be
defective.
PROBABLE CAUSES
Damaged tailgate latch
Damaged electric tailgate control unit
Damaged wiring harness and connectors
DIAGNOSIS PROCEDURE
STEP 1. Door-ajar switch inspection
Check the tailgate latch (refer to ).
Q.
Is the check result normal?
Go to Step 2.
Replace the tailgate latch.
STEP 2. Resistance measurement at tailgate latch connector (door-ajar
switch earth line terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between tailgate latch connector (door-ajar switch earth
line terminal) and body earth. OK: Continuity exists (2 Ω or less).
Q.
Is the check result normal?
Go to Step 4.
Go to Step 3.
STEP 3. Check of open circuit in earth line between tailgate latch
connector (door-ajar switch terminal) and body earth.
Q.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
STEP 4. Check of open circuit in LTH line between electric tailgate
control unit connector and tailgate latch connector.
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness.
STEP 5. System retest
Check that the door-ajar switch signal is 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 6.
STEP 6. After the replacement of tailgate latch, recheck the trouble
symptom.
(1)Replace the tailgate latch.
(2)Check that the door-ajar switch signal is received normally.
Go to Step 2.
Replace the tailgate latch.