Lexus IS250 IS220d GSE20 ALE20 - THEFT DETERRENT
THEFT DETERRENT SYSTEM (w/ 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.
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 |
| S+B (J75-11) - Body ground | G - Body ground | Intrusion sensor power supply | Arming preparation state or armed state | 10 to 14 V |
| S+B (J75-11) - Body ground | G - Body ground | Intrusion sensor power supply | Disarmed state | Below 1 V |
| ISIF (J75-13) - Body ground | SB - Body ground | Intrusion sensor signal input | No moving object detected by sensor | 10 to 14 V |
| ISIF (J75-13) - Body ground | SB - Body ground | Intrusion sensor signal input | Moving object detected by sensor during arming preparation state or armed state | Pulse generation |
| CHECK ENGINE ROOM NO. 2 R/B ASSEMBLY (FRONT CONTROLLER) |
Disconnect the 2G R/B connector.
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) |
LEXUS IS250, IS220d / GSE20 ALE20