Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Terminals Of Ecm

TERMINALS OF ECM

ECM

HINT:

The standard voltage and resistance of each ECM terminal is shown in the table below.

In the table, first follow the information under "Condition". Look under "Terminal No. (Symbol)" for the terminals to be inspected. The standard voltage or resistance between the terminals is shown under "Specified Condition".

Use the illustration above as a reference for the ECM terminals.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A37-1 (BATT) - D2-53 (E1)

G - BR

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A37-2 (+B) - D2-53 (E1)

R - BR

Power source of ECM

Engine switch on (IG)

11 to 14 V

A37-3 (+B2) - D2-53 (E1)

L - BR

Power source of ECM

Engine switch on (IG)

11 to 14 V

A37-13 (CANH) - D2-53 (E1)

Y - BR

CAN communication line

Engine switch on (IG)

Pulse generation

A37-17 (S) - D2-53 (E1)

B - BR

M shift position switch signal

Engine switch on (IG) and shift lever in M

11 to 14 V

Engine switch on (IG) and shift lever not in M

Below 1 V

A37-26 (CANL) - D2-53 (E1)

P - BR

CAN communication line

Engine switch on (IG)

Pulse generation

A37-27 (STP) - D2-53 (E1)

Y - BR

Stop light switch signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

Below 1 V

A37-37 (SFTD) - D2-53 (E1)

BE - BR

Down-shift switch signal

Engine switch on (IG)

11 to 14 V

Engine switch on (IG) and shift lever held in "-" (Down shift)

Below 1 V

Engine switch on (IG) and "-" shift paddle switch pulled

Below 1 V

A37-38 (SFTU) - D2-53 (E1)

V - BR

Up-shift switch signal

Engine switch on (IG)

11 to 14 V

Engine switch on (IG) and shift lever held in "+" (Up shift)

Below 1 V

Engine switch on (IG) and "+" shift paddle switch pulled

Below 1 V

A37-40 (SPCN) - D2-53 (E1)

SB - BR

Pattern select switch (NORMAL) signal

Engine switch on (IG) and pattern select switch being pushed and held at NORMAL position

Below 1.5 V

Engine switch on (IG) and pattern select switch not pushed

11 to 14 V

A37-43 (STA) - D2-53 (E1)

B - BR

Starter signal

Cranking (shift lever in P or N, engine switch on (START))

11 to 14 V

Engine switch on (IG) and shift lever in P or N

Below 2 V

A37-55 (PWMS) - D2-53 (E1)

GR - BR

Pattern select switch (SPORT) signal

Engine switch on (IG) and pattern select switch being turned and held at SPORT position

Below 1.5 V

Engine switch on (IG) and pattern select switch not turned

11 to 14 V

D2-6 (SL2+) - D2-7 (SL2-)

LG - Y

Shift solenoid valve SL2 signal

5th, 6th, 7th or 8th gear

Pulse generation

D2-10 (SL5+) - D2-11 (SL5-)

W - Y

Shift solenoid valve SL5 signal

2nd or 8th gear

Pulse generation

D2-12 (SL4+) - D2-13 (SL4-)

LG - GR

Shift solenoid valve SL4 signal

4th or 6th gear

Pulse generation

D2-14 (SL1+) - D2-15 (SL1-)

Y - BR

Shift solenoid valve SL1 signal

1st, 2nd, 3rd, 4th or 5th gear

Pulse generation

D2-31 (SL3+) - D2-1 (SL3-)

GR - B

Shift solenoid valve SL3 signal

3rd or 7th gear

Pulse generation

D2-53 (E1) - Body ground

BR - Body ground

Ground

Always

Below 1 Ω

D2-62 (S1) - D2-53 (E1)

G - BR

Shift solenoid valve S1 signal

  • Shift lever in P or N
  • S1, M1 or D1 range (1st gear) selected

11 to 14 V

D2-67 (SLT+) - D2-37 (SLT-)

L - GR

Shift solenoid valve SLT signal

Engine idling

Pulse generation

D2-72 (NCO) - D2-53 (E1)

Y - BR

Transmission Revolution Sensor (NC) signal

Vehicle being driven

Pulse generation

D2-73 (NCB) - D2-53 (E1)

L - BR

Power source for sensor

(specific voltage)

Engine switch on (IG)

11 to 14 V

D2-74 (NTO) - D2-53 (E1)

B - BR

Transmission Revolution Sensor (NT) signal

Engine idling (shift lever in P or N)

Pulse generation

D2-75 (NTB) - D2-53 (E1)

Y - BR

Power source for sensor

(specific voltage)

Engine switch on (IG)

11 to 14 V

D2-76 (SLU+) - D2-61 (SLU-)

L - B

Shift solenoid valve SLU signal

  • D position:

    1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear

    (Flex lock-up ON and Lock-up ON )

  • M position:

    3rd, 4th, 5th, 6th, 7th or 8th gear

    (Lock-up ON )

Pulse generation

D2-77 (S2) - D2-53 (E1)

BE - BR

Shift solenoid valve S2 signal

3rd gear

11 to 14 V

D2-78 (NC3B) - D2-53 (E1)

B - BR

Power source for sensor

(specific voltage)

Engine switch on (IG)

11 to 14 V

D2-86 (THO1) - D2-133 (ETHW)

W - BR

ATF temperature sensor signal

ATF temperature 115°C (239°F) or higher

Below 1.5 V

D2-106 (NSW) - D2-53 (E1)

V - BR

Park/neutral position switch signal

Engine switch on (IG) and shift lever in P or N

Below 1 V

Engine switch on (IG) and shift lever not in P or N

11 to 14 V

D2-107 (R) - D2-53 (E1)

GR - BR

R shift position switch signal

Engine switch on (IG) and shift lever in R

11 to 14 V

Engine switch on (IG) and shift lever not in R

Below 1 V

D2-108 (P) - D2-53 (E1)

V - BR

P shift position switch signal

Engine switch on (IG) and shift lever in P

11 to 14 V

Engine switch on (IG) and shift lever not in P

Below 1 V

D2-110 (NC3O) - D2-53 (E1)

W - BR

Transmission Revolution Sensor (NC3) signal

1st, 3rd, 4th, 5th, 6th or 7th gear

Pulse generation

D2-139 (D) - D2-53 (E1)

B - BR

D shift position switch signal

Engine switch on (IG) and shift lever in D or M

11 to 14 V

Engine switch on (IG) and shift lever not in D or M

Below 1 V

D2-140 (N) - D2-53 (E1)

BR - BR

N shift position switch signal

Engine switch on (IG) and shift lever in N

11 to 14 V

Engine switch on (IG) and shift lever not in N

Below 1 V

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