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Inspection Procedure B-4: Door-ajar signal is not received.
 
 
cautionBefore 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 power liftgate control unit, the liftgate latch itself or the power liftgate control unit itself may be defective.
 
 
PROBABLE CAUSES
  • Damaged liftgate latch
  • Damaged power liftgate control unit
  • Damaged wiring harness and connectors
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Door-ajar switch inspection
Check the liftgate latch (refer to ).
Is the check result normal?
Go to Step 2.
Replace the liftgate latch.
 
STEP 2. Resistance measurement at liftgate latch connector (door-ajar switch ground line terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between liftgate latch connector (door-ajar switch ground line terminal) and body ground.
OK: Continuity exists (2 Ω or less).
Is the check result normal?
Go to Step 4.
Go to Step 3.
 
STEP 3. Check of open circuit in ground line between liftgate latch connector (door-ajar switch terminal) and body ground.
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 power liftgate control unit connector and liftgate latch connector.
Is the check result normal?
Go to Step 5.
Repair the wiring harness.
 
STEP 5. Check of the troubles
Check that the door-ajar switch signal is received normally.
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 liftgate latch, recheck of the troubles.
(1) Replace the liftgate latch.
(2) Check that the door-ajar switch signal is received normally.
Is the check result normal?
The procedure is complete.
Replace the power liftgate control unit.