THEFT DETERRENT SYSTEM (w/o Intrusion Sensor) - TERMINALS OF ECU

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

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

Theft Deterrent System (W/O Intrusion Sensor) - Terminals Of Ecu. THEFT DETERRENT. Lexus IS250 IS220d GSE20 ALE20

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: LHD

*2: RHD

If the result is not as specified, there may be a malfunction on the wire harness side.

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

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)

Disconnect the 2G R/B connector.

Theft Deterrent System (W/O Intrusion Sensor) - Terminals Of Ecu. THEFT DETERRENT. Lexus IS250 IS220d GSE20 ALE20

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.

Reconnect the and 2G R/B connector.

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)