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
PROBABLE CAUSES
- Damaged wiring harness and connectors
- Malfunction of the electric tailgate control unit
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?
STEP 2. Check of open circuit in GND1 line between electric tailgate control unit connector and body earth.
Q.
Is the check result normal?
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?
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?
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?
STEP 6. Check of open circuit in BAT1 line between electric tailgate control unit connector and fusible link.
Q.
Is the check result normal?
STEP 7. System retest
Q.
Is the check result normal?