STEP 1. Resistance measurement at the lighting control sensor connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the lighting control sensor connector (ground terminal) and the body ground.OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 3. Go to Step 2.
STEP 2. Check of open circuit in body ground line between lighting control sensor connector (ground terminal) and the body ground.
STEP 3. Voltage measurement at the lighting control sensor connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the lighting control sensor connector (power supply terminal) and the body ground.OK: OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 5. Go to Step 4.
STEP 4. Check of short to power supply, short to ground, and open circuit in BUP1 line between ETACS-ECU connector and lighting control sensor connector.
STEP 5. Check of open circuit in LIN2 line between ETACS-ECU connector and lighting control sensor connector.
STEP 6. Check whether the DTC is set again.
Check again if the DTC is set in the ETACS-ECU.(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if DTC is set.
Is the DTC set?
Replace the lighting control sensor (Refer to GROUP 54A - Lighting Control Sensor ). A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the lighting control sensor and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).