Theft Deterrent System (W/O Intrusion Sensor) Terminals Of Ecu

Securities. Lexus Is250, Is220D. Gse20 Ale20
Theft Deterrent. Lexus Is250, Is220D. Gse20 Ale20

  1. CHECK MAIN BODY ECU RH (COWL SIDE J/B RH)

  1. CHECK ENGINE ROOM NO. 2 R/B ASSEMBLY (FRONT CONTROLLER)

Theft Deterrent System (W/O Intrusion Sensor) -- Terminals Of Ecu



CHECK MAIN BODY ECU RH (COWL SIDE J/B RH)


  1. Disconnect the main body ECU RH (cowl side J/B RH) connectors.


    Lexus Is250, Is220D. Gse20 Ale20.Theft Deterrent.Theft Deterrent System (W/ Intrusion Sensor).Theft Deterrent System (W/O Intrusion Sensor) Terminals Of Ecu

  2. Measure the resistance and voltage of the wire harness side connectors.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    PCTY (J75-23) - Body ground
    		B*1 - Body ground
    		Passenger side courtesy light switch input
    		Passenger side door CLOSED (OFF) → OPEN (ON)
    		10 kΩ or higher → Below 1 Ω
    PCTY (J75-23) - Body ground
    		V*2 - Body ground
    		Passenger side courtesy light switch input
    		Passenger side door CLOSED (OFF) → OPEN (ON)
    		10 kΩ or higher → Below 1 Ω
    LGCY (J75-25) - Body ground
    		L - Body ground
    		Luggage compartment door courtesy light switch input
    		Luggage compartment door CLOSED (OFF) → OPEN (ON)
    		10 kΩ or higher → Below 1 Ω
    DCTY (P1-14) - Body ground
    		W - Body ground
    		Driver side door courtesy light switch input
    		Driver side door CLOSED (OFF) → OPEN (ON)
    		10 kΩ or higher → Below 1 Ω
    RCTY (P1-16) - Body ground
    		O - Body ground
    		Rear courtesy light switch RH input
    		Rear door RH CLOSED (OFF) → OPEN (ON)
    		10 kΩ or higher → Below 1 Ω
    GND2 (RA-5) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    LCTY (RA-11) - Body ground
    		BR - Body ground
    		Rear courtesy light switch LH input
    		Rear door LH CLOSED (OFF) → OPEN (ON)
    		10 kΩ or higher → Below 1 Ω
    ALTB (RM-1) - Body ground
    		B - Body ground
    		+B (power generator system) power supply
    		Always
    		10 to 14 V
    GND2 (RD-7) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    BECU (RK-5) - Body ground
    		G-R - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    ACC (RM-1) - Body ground
    		B - Body ground
    		Ignition power supply (ACC signal)
    		Engine switch on (ACC) → off
    		10 to 14 V → Below 1 V
    IG (RM-1) - Body ground
    		B - Body ground
    		Ignition power supply (IG signal)
    		Engine switch on (ACC) → off
    		10 to 14 V → Below 1 V
    BATB (RN-1) - Body ground
    		R - Body ground
    		+B (power battery system) power supply
    		Always
    		10 to 14 V
    HINT:
    1. *1: LHD
    2. *2: RHD
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the main body ECU RH (cowl side J/B RH) connectors.

  4. Measure the voltage of the wire harness side connectors.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SH (A36-1) - Body ground
    		 W- Body ground
    		Security horn drive
    		Security horn is sounding (Theft deterrent system is in alarm sounding state)
    		Pulse generation
    0 V ← → 12 V
    HAZ (J74-2) - Body ground
    		Y - Body ground
    		Hazard warning light signal
    		Hazard warning lights are blinking (Theft deterrent system is in alarm sounding state)
    		Pulse generation
    0 V ← → 12 V
    IND (J74-24) - Body ground
    		LG - Body ground
    		Security indicator output
    		Security indicator light up
    (It lights up only for 30 sec. in alarm sounding state. It flashes when immobiliser is operating.)
    		3 to 6 V

CHECK ENGINE ROOM NO. 2 R/B ASSEMBLY (FRONT CONTROLLER)


  1. Disconnect the 2G R/B connector.


    Lexus Is250, Is220D. Gse20 Ale20.Theft Deterrent.Theft Deterrent System (W/ Intrusion Sensor).Theft Deterrent System (W/O Intrusion Sensor) Terminals Of Ecu

  2. Measure the resistance between each terminal of the wire harness connector and body ground.

    Terminal No.
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    2G-3 - Body ground
    		W-L - Body ground
    		Engine hood courtesy switch
    		Engine hood CLOSED (OFF) → OPEN (ON)
    		10 kΩ or higher → Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the and 2G R/B connector.

  4. Measure the voltage between each terminal of the connector and body ground.

    Terminal No.
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    2G-1 - Body ground
    		B - Body ground
    		Vehicle horn drive
    		Vehicle horn is sounding
    (Theft deterrent system is in alarm sounding state)
    		Pulse generation
    (0 V ← → 12 V)
    2G-2 - Body ground
    		B-R - Body ground
    		Vehicle horn drive
    		Vehicle horn is sounding
    (Theft deterrent system is in alarm sounding state)
    		Pulse generation
    (0 V ← → 12 V)