Inspection Procedure A-1: Power supply circuit system abnormality of electric tailgate control unit.



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


COMMENTS ON TROUBLE SYMPTOM


If the electric tailgate control unit functions do not work at all, the electric tailgate control unit power supply system, earth system, or electric tailgate control unit may have a problem.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Resistance measurement at electric tailgate control unit connector (GND1 terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between electric tailgate control unit connecter (GND1 terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 3.

Go to Step 2.

STEP 2. Check of open circuit in GND1 line between electric tailgate control unit connector and body earth.


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 .)

Repair the connector(s) or wiring harness.

STEP 3. Voltage measurement at electric tailgate control unit connector (BUP2 and IG12 terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between electric tailgate control unit connecter (BUP2 terminal) and body earth.
OK: System voltage
(3)Measure the voltage between electric tailgate control unit connecter (IG12 terminal) and body earth.
OK: System voltage (when ignition switch is ON)

Q. Is the check result normal?

Go to Step 5.

Go to Step 4.

STEP 4. Check of open circuit in BUP2 and IG12 line between electric tailgate control unit connector and fusible link.


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 .)

Repair the connector(s) or wiring harness.

STEP 5. Voltage measurement at electric tailgate control unit connector (BAT1 terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between electric tailgate control unit connecter (BAT1 terminal) and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 7.

Go to Step 6.

STEP 6. Check of open circuit in BAT1 line between electric tailgate control unit connector and fusible link.


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 .)

Repair the connector(s) or wiring harness.

STEP 7. System retest


Check that the electric tailgate control unit function works 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 .)

Replace the electric tailgate control unit.