Terminals Of Ecu

WARNING: This page is about a different car, the 2011 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 RK, RN and RD main body ECU RH (cowl side junction block RH) connectors.

Fig 1: Identifying ECU Connectors Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage and resistance according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
RK-5 (BECU) - Body ground	G-R - Body ground	Battery power supply	Always	11 to 14 V
RN-1 (BATB) - Body ground	R - Body ground	Battery power supply	Always	11 to 14 V
RD-7 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
RD-17 (GND1) - 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 RK, RN and RD main body ECU RH (cowl side junction block RH) connectors.

Measure the voltage according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P1-14 (DCTY) - Body ground	W - Body ground	Driver side door courtesy switch input	Driver side door open	Below 1 V
P1-14 (DCTY) - Body ground	W - Body ground	Driver side door courtesy switch input	Engine switch off, and driver side door courtesy switch off	11 to 14 V
J75-23 (PCTY) - Body ground	B - Body ground	Front passenger side door courtesy switch input	Front passenger side door open	Below 1 V
J75-23 (PCTY) - Body ground	B - Body ground	Front passenger side door courtesy switch input	Engine switch off, and passenger side door courtesy switch off	11 to 14 V
RA-11 (LCTY) - Body ground	BR - Body ground	Rear door LH courtesy light switch input	Rear door LH open	Below 1 V
RA-11 (LCTY) - Body ground	BR - Body ground	Rear door LH courtesy light switch input	Engine switch off, and rear door courtesy switch LH off	11 to 14 V
P1-16 (RCTY) - Body ground	BE - Body ground	Rear door RH courtesy light switch input	Rear door RH open	Below 1 V
P1-16 (RCTY) - Body ground	BE - Body ground	Rear door RH courtesy light switch input	Engine switch off, and rear door courtesy switch RH off	11 to 14 V
J75-25 (LGCY) - Body ground	L - Body ground	Luggage compartment door courtesy light switch input	Luggage compartment door open	Below 1 V
J75-25 (LGCY) - Body ground	L - Body ground	Luggage compartment door courtesy light switch input	Engine switch off, and luggage compartment door closed	11 to 14 V
RJ-9 (ACT+) - Body ground	L - Body ground	Door lock motor lock drive output (all doors)	Multiplex network master switch (door control switch) or driver side door key cylinder off	Below 1 V
RJ-9 (ACT+) - Body ground	L - Body ground	Door lock motor lock drive output (all doors)	Multiplex network master switch (door control switch) or driver side door key cylinder lock	11 to 14 V
P1-4 (ACTD) - Body ground	L - Body ground	Driver side door lock motor unlock drive output	Multiplex network master switch (door control switch) or driver side door key cylinder off	Below 1 V
P1-4 (ACTD) - Body ground	L - Body ground	Driver side door lock motor unlock drive output	Multiplex network master switch (door control switch) or driver side door key cylinder unlock	11 to 14 V
RJ-17 (ACT-) - Body ground	LG - Body ground	Door lock motor unlock drive output (except driver side)	Multiplex network master switch (door control switch) or driver side door key cylinder off	Below 1 V
RJ-17 (ACT-) - Body ground	LG - Body ground	Door lock motor unlock drive output (except driver side)	Multiplex network master switch (door control switch) or driver side door key cylinder unlock	11 to 14 V
J75-27 (LSWP) - Body ground	W - Body ground	Passenger side door lock position switch input	Passenger side door unlock	Below 1 V
J75-27 (LSWP) - Body ground	W - Body ground	Passenger side door lock position switch input	Engine switch off, all doors closed and passenger side door lock	11 to 14 V
RA-2 (LSWL) - Body ground	R - Body ground	Rear door LH lock position switch input	Rear door LH unlock	Below 1 V
RA-2 (LSWL) - Body ground	R - Body ground	Rear door LH lock position switch input	Engine switch off, all doors closed and rear door LH lock	11 to 14 V
J75-5 (LSWR) - Body ground	V - Body ground	Rear door RH lock position switch input	Rear door RH unlock	Below 1 V
J75-5 (LSWR) - Body ground	V - Body ground	Rear door RH lock position switch input	Engine switch off, all doors closed and rear door RH lock	11 to 14 V
RA-7 (GSW) - Body ground	L - Body ground	Center airbag sensor signal	Turn the engine switch on (IG) with the center airbag sensor assembly connector disconnected	4.5 to 5.5 V

If the result is not as specified, the main body ECU RH (cowl side junction block RH) may have a malfunction.

CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

Disconnect the M18 multiplex network master switch assembly connector.

Fig 2: M18 Multiplex Network Master Switch Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage and resistance according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
M18-15 (CPUB) - M18-12 (E)	G - W-B	Battery power supply	Always	11 to 14 V
M18-18 (SIG) - M18-12 (E)	B - W-B	SIG power supply	Engine switch on (IG) → off	11 to 14 V → Below 1 V
M18-12 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
M18-4 (KL) - M18-12 (E)	L - W-B	Door key-linked door lock input	Using key, operate driver door lock cylinder from free → lock	10 kΩ or higher → Below 1 Ω
M18-13 (KUL) - M18-12 (E)	W - W-B	Door key-linked door unlock input	Using key, operate driver door lock cylinder from free → unlock	10 kΩ or higher → Below 1 Ω
M18-1 (LSW) - M18-12 (E)	SB - W-B	Driver side door lock position switch input	Driver side door unlock → lock	Below 1 Ω → 10 kΩ or higher

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