STEP 1. Check the stoplight switch.
STEP 2. Scan tool (M.U.T.-IIISE) actuator test.
STEP 3. Check of short to power supply, short to ground, and open circuit in STLD line between ASC-ECU connector and ETACS-ECU connector.
STEP 4. Check of short to power supply, short to ground, and open circuit in STP line between ASC-ECU connector and stoplight connector.
STEP 5. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
Is DTC No.C1801 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). This diagnosis is complete.