Lexus IS250 IS220d GSE20 ALE20 - DOOR LOCK
WIRELESS DOOR LOCK CONTROL SYSTEM - 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 |
| 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 |
| IG (RM-1) - Body ground | B - Body ground | Ignition power supply (IG signal) | Engine switch on (IG) → off | 10 to 14 V → Below 1 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 resistance and 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 | Answer back security horn is not sounding → Sounding | Below 1 V → 10 to 14 V |
| BZR* (A36-2) - Body ground | G - Body ground | Wireless door lock buzzer | Wireless doo lock buzzer OFF → ON | 0 V → Pulse generation |
| TR+ (J74-1) - Body ground | P - Body ground | Luggage compartment door opener motor input | Luggage compartment door CLOSED (LOCKED) → OPEN (UNLOCKED) | Below 1 V → 10 to 14 V |
| HAZ (J74-2) - Body ground | Y - Body ground | Turn signal flasher relay signal | Any transmitter switch is pressed → not pressed | Below 1 V → 10 to 14 V |
- HINT:
- *: Australia, New Zealand
| CHECK CERTIFICATION ECU ASSEMBLY |
Disconnect the P33 ECU connector.
Measure the voltage and resistance of the wire harness side connector.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| +B1 (P33-1) - E (P33-17) | L - W-B | Battery power supply | Always | 10 to 14 V |
| E (P33-17) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| IG (P33-18) - E (P33-17) | B - W-B | IG power supply | Engine switch on (IG) | 10 to 14 V |
| IG (P33-18) - E (P33-17) | B - W-B | IG power supply | Engine switch off | Below 1 V |
If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the P33 ECU connector.
Measure the voltage of the connector.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| RC0 (P33-29) - E (P33-17) | Y - W-B | Door control receiver power supply | Engine switch off, all doors closed and transmitter switch not pressed | Below 1 V |
| RC0 (P33-29) - E (P33-17) | Y - W-B | Door control receiver power supply | Engine switch off, all doors closed and transmitter switch pressed | 4.6 to 5.4 V |
| RDA (P33-38) - E (P33-17) | R - W-B | Door control receiver output signal | Engine switch off, all doors closed and transmitter switch not pressed | 10 to 14 V |
| RDA (P33-38) - E (P33-17) | R - W-B | Door control receiver output signal | Engine switch off, all doors closed and transmitter switch pressed | Pulse generation |
If the result is not as specified, the ECU may have a malfunction.