Terminals Of Ecu
WARNING: This page is about a different car, the 2009 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)
- Disconnect the main body ECU RH (cowl side junction block RH) connectors.
- Measure the resistance and voltage according to the value(s) in the table below.
Tester Connection Wiring Color Terminal Description Condition Specified Condition J75-23 (PCTY) - Body ground B - Body ground Front passenger side courtesy light switch input Front passenger side door CLOSED (OFF) → OPEN (ON) 10 kΩ or higher → Below 1 Ω J75-25 (LGCY) - 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 P1-14 (DCTY) - 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 P1-16 (RCTY) - Body ground O - Body ground Rear door courtesy light switch RH input Rear door RH CLOSED (OFF) → OPEN (ON) 10 kΩ or higher → Below 1 Ω RD-11 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω RA-11 (LCTY) - Body ground BR - Body ground Rear door courtesy light switch LH input Rear door LH CLOSED (OFF) → OPEN (ON) 10 kΩ or higher → Below 1 Ω RA-15 (ALTB) - Body ground SB - Body ground +B (power generator system) power supply Always 11 to 14 V RD-7 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω RK-5 (BECU) - Body ground G-R - Body ground +B power supply Always 11 to 14 V RM-1 (ACC) - Body ground B - Body ground Ignition power supply (ACC signal) Engine switch on (ACC) → off 11 to 14 V → Below 1 V RM-1 (IG) - Body ground B - Body ground Ignition power supply (IG signal) Engine switch on (IG) → off 11 to 14 V → Below 1 V RN-1 (BATB) - Body ground R - Body ground +B (power battery system) power supply Always 11 to 14 V If the result is not as specified, there may be a malfunction in the wire harness.
- Reconnect the main body ECU RH (cowl side junction block RH) connectors.
- Measure the resistance and voltage according to the value(s) in the table below.
Tester Connection Wiring Color Terminal Description Condition Specified Condition A36-1 (SH) - Body ground W - Body ground Security horn drive Answer back security horn is not sounding → Sounding Below 1 V → 11 to 14 V A36-2 (BZR) - Body ground G - Body ground Wireless door lock buzzer Wireless door lock buzzer OFF → ON Below 1 V → Pulse generation J74-1 (TR+) - Body ground P - Body ground Luggage compartment door opener motor input Luggage compartment door CLOSED (LOCKED) → OPEN (UNLOCKED) Below 1 V → 11 to 14 V J74-2 (HAZ) - Body ground Y - Body ground Turn signal flasher relay signal Any transmitter switch is pressed → not pressed Below 1 V → 11 to 14 V
- CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY
- Disconnect the P33 ECU connector.
- Measure the voltage and resistance according to the value(s) in the table below.
Tester Connection Wiring Color Terminal Description Condition Specified Condition P33-1 (+B1) - P33-17 (E) L - W-B Battery power supply Always 11 to 14 V P33-17 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω - If the result is not as specified, there may be a malfunction in the wire harness.
- Reconnect the P33 ECU connector.
- Measure the voltage according to the value(s) in the table below.
Tester Connection Wiring Color Terminal Description Condition Specified Condition P33-18 (IG) - P33-17 (E) B - W-B IG power supply Engine switch on (IG) 11 to 14 V P33-18 (IG) - P33-17 (E) B - W-B IG power supply Engine switch off Below 1 V P33-29 (RC0) - P33-17 (E) LG - W-B Door control receiver power supply Engine switch off, all doors closed and transmitter switch not pressed Below 1 V P33-29 (RC0) - P33-17 (E) LG - W-B Door control receiver power supply Engine switch off, all doors closed and transmitter switch pressed 4.6 to 5.4 V P33-38 (RDA) - P33-17 (E) R - W-B Door control receiver input signal Engine switch off, all doors closed and transmitter switch not pressed 11 to 14 V pulse generation at regular intervals P33-38 (RDA) - P33-17 (E) R - W-B Door control receiver input signal Engine switch off, all doors closed and transmitter switch pressed Pulse generation - If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.