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Inspection Procedure B-7: Liftgate sensor 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 liftgate sensor and the power liftgate control unit, the liftgate sensor itself, or the power liftgate control unit itself may have a problem.
 
 
PROBABLE CAUSES
  • Liftgate sensor malfunction
  • Damaged power liftgate control unit
  • Damaged wiring harness and connectors
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Using scan tool (M.U.T.-IIISE), check data list
(1) Disconnect the negative battery terminal and wait for approximately 30 seconds.
(2) Check the signals related to the power liftgate operation.
  • Liftgate sensor (left): OFF → ON
  • Liftgate sensor (right): OFF → ON
 
Item No.Item nameNormal conditions
9Touch sensor (Left)OFF → ON
10Touch sensor (Right)OFF → ON
OK: Normal conditions are displayed for all the items.
Is the check result normal?
: Go to Step 7.
: Go to Step 2.
: Go to Step 3.
: Go to Step 5.
 
STEP 2. Check of open circuit in TSG line between power liftgate control unit connector and liftgate sensor (LH) and (RH) connector.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
 
STEP 3. Liftgate sensor (LH) check.
Check the liftgate sensor (LH) (refer to ).
Is the check result normal?
Go to Step 4.
Replace the liftgate sensor (LH).
 
STEP 4. Check of short to power supply, short to ground, and open circuit in TSL line between power liftgate control unit connector and liftgate sensor (LH) connector.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
 
STEP 5. Liftgate sensor (RH) check.
Check the liftgate sensor (RH) (refer to ).
Is the check result normal?
Go to Step 6.
Replace the liftgate sensor (RH).
 
STEP 6. Check of short to power supply, short to ground, and open circuit in TSR line between power liftgate control unit connector and liftgate sensor (RH) connector.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
 
STEP 7. Check of the troubles
Check that the liftgate sensor 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 .)
Replace the power liftgate control unit.