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

TERMINALS OF ECU

COMBINATION METER ASSEMBLY

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J10-2 (MSM+) - Body ground

Y - Body ground

Steering pad switch signal

Engine switch on (IG), enter, back and top switches on steering pad switch assembly not pushed

4.3 to 6 V

Engine switch on (IG), enter switch on steering pad switch assembly pushed

Below 0.6 V

Engine switch on (IG), back switch on steering pad switch assembly pushed

2.3 to 3.2 V

Engine switch on (IG), top switch on steering pad switch assembly pushed

1 to 2 V

J10-3 (MSTI) - Body ground

LG - Body ground

Steering pad switch signal

Engine switch on (IG), up, down, right and left switches on steering pad switch assembly not pushed

4.3 to 6 V

Engine switch on (IG), up switch on steering pad switch assembly pushed

1 to 2 V

Engine switch on (IG), down switch on steering pad switch assembly pushed

2.3 to 3.2 V

Engine switch on (IG), right switch on steering pad switch assembly pushed

3.4 to 4.1 V

Engine switch on (IG), left switch on steering pad switch assembly pushed

Below 0.6 V

J10-4 (ODO) - Body ground

W - Body ground

ODO/TRIP switch signal

Engine switch on (IG), ODO/TRIP switch not pushed

4 to 6 V

Engine switch on (IG), ODO/TRIP switch pushed

Below 1 V

J10-6 (RRBT) - Body ground*1

W - Body ground

Rear No. 2 seat belt buckle switch RH signal

Engine switch on (IG), rear No. 2 seat belt RH unfastened

Below 1 V

Engine switch on (IG), rear No. 2 seat belt RH fastened

11 to 14 V

J10-8 (RLBT) - Body ground*1

R - Body ground

Rear No. 2 seat belt buckle switch LH signal

Engine switch on (IG), rear No. 2 seat belt LH unfastened

Below 1 V

Engine switch on (IG), rear No. 2 seat belt LH fastened

11 to 14 V

J10-9 (S) - Body ground

V - Body ground

Engine oil pressure signal

Engine started

11 to 14 V

Engine not started

Below 1 V

J10-12 (RRSB) - Body ground

W - Body ground

Rear seat belt buckle switch RH signal

Engine switch on (IG), rear seat belt RH unfastened

Below 1 V

Engine switch on (IG), rear seat belt RH fastened

11 to 14 V

J10-13 (RCSB) - Body ground*2

B - Body ground

Rear seat belt buckle switch center signal

Engine switch on (IG), rear seat belt center unfastened

Below 1 V

Engine switch on (IG), rear seat belt center fastened

11 to 14 V

J10-14 (RLSB) - Body ground

R - Body ground

Rear seat belt buckle switch LH signal

Engine switch on (IG), rear seat belt LH unfastened

Below 1 V

Engine switch on (IG), rear seat belt LH fastened

11 to 14 V

J10-15 (OILW) - Body ground

SB - Body ground

Engine oil level signal

Engine switch on (IG), engine oil level not low

11 to 14 V

Engine switch on (IG), engine oil level low

Below 1 V

J10-16 (WLVL) - Body ground

L - Body ground

Washer fluid level signal

Engine switch on (IG), washer fluid level not low

11 to 14 V

Engine switch on (IG), washer fluid level low

Below 1 V

J10-17 (SW) - Body ground

LG - Body ground

Brake fluid level signal

Engine switch on (IG), brake fluid level not low (brake warning light / red (malfunction) off)

11 to 14 V

Engine switch on (IG), brake fluid level low (brake warning light / red (malfunction) on)

Below 1 V

J10-18 (FV) - Body ground

R - Body ground

Fuel sender gauge (Power source)

Engine switch on (IG)

Pulse generation (See waveform 3)

J10-19 (+S) - Body ground

V - Body ground

Speed signal for other system (Output)

Engine switch on (IG), wheel being rotated

Pulse generation (See waveform 1)

J10-20 (SI) - Body ground

P - Body ground

Speed signal for other system (Input)

Engine switch on (IG), wheel being rotated

Pulse generation (See waveform 1)

J10-21 (IG+) - Body ground

GR - Body ground

Engine switch signal

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

J10-22 (B) - Body ground

G - Body ground

Battery

Always

11 to 14 V

J10-23 (IND) - Body ground

B - Body ground

Vacuum warning switch signal

Engine started, vacuum warning switch off (brake warning light / red (malfunction) off)

11 to 14 V

Engine started, vacuum warning switch on (brake warning light / red (malfunction) on)

Below 1 V

J10-25 (TR) - Body ground

BE - Body ground

Light control rheostat switch signal

Engine switch on (IG), up switch and down switch of trip switch not pushed

4 to 6 V

Engine switch on (IG), up switch or down switch of trip switch pushed

Below 1 V

J10-26 (SW3) - Body ground

V - Body ground

Ground for trip switch

Always

Below 1 Ω

J10-27 (FR) - J10-28 (FE)

P - G

Fuel level signal

Engine switch on (IG), fuel level full → low (fuel level warning light on)

Pulse generation (See waveform 2)

J10-29 (CANH)

GR

CAN communication line

-

-

J10-30 (CANL)

W

CAN communication line

-

-

J10-31 (ES) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

J10-32 (L) - Body ground*1

L - Body ground

Rear seat belt warning light (rear No. 2 seat LH) output signal

Engine switch on (IG), rear seat belt warning light (rear No. 2 seat LH) off

11 to 14 V

Engine switch on (IG), rear seat belt warning light (rear No. 2 seat LH) on

Below 1 V

J10-33 (SW) - Body ground*1

R - Body ground

Rear seat belt warning light (rear No. 2 seat RH) output signal

Engine switch on (IG), rear seat belt warning light (rear No. 2 seat RH) off

11 to 14 V

Engine switch on (IG), rear seat belt warning light (rear No. 2 seat RH) on

Below 1 V

J10-35 (RLMT) - Body ground

Y - Body ground

Rear seat belt warning light LH output signal

Engine switch on (IG), rear seat belt warning light LH off

11 to 14 V

Engine switch on (IG), rear seat belt warning light LH on

Below 1 V

J10-36 (RCMT) - Body ground*2

W - Body ground

Rear seat belt warning light center output signal

Engine switch on (IG), rear seat belt warning light center off

11 to 14 V

Engine switch on (IG), rear seat belt warning light center on

Below 1 V

J10-37 (RRMT) - Body ground

B - Body ground

Rear seat belt warning light RH output signal

Engine switch on (IG), rear seat belt warning light RH off

11 to 14 V

Engine switch on (IG), rear seat belt warning light RH on

Below 1 V

J10-38 (IL2-) - Body ground

G - Body ground

Illumination signal

Headlight dimmer switch off

Below 1 V

Headlight dimmer switch in tail or head position

Pulse generation

J10-39 (ILL-) - Body ground

L - Body ground

Illumination signal

Headlight dimmer switch off

Below 1 V

Headlight dimmer switch in tail or head position

Pulse generation

J10-40 (EP) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

J11-1 (B) - Body ground

Y - Body ground

Battery

Always

11 to 14 V

J11-2 (HZSW) - Body ground

GR - Body ground

Hazard warning signal switch signal (Input)

Hazard warning signal switch not pressed

11 to 14 V

Hazard warning signal switch pressed

Below 1 V

J11-3 (ER) - Body ground

SB - Body ground

RH turn signal switch signal

Engine switch on (IG), RH turn signal switch off

11 to 14 V

Engine switch on (IG), RH turn signal switch on

Below 1 V

J11-4 (EL) - Body ground

BE - Body ground

LH turn signal switch signal

Engine switch on (IG), LH turn signal switch off

11 to 14 V

Engine switch on (IG), LH turn signal switch on

Below 1 V

J11-5 (TRNR) - Body ground

V - Body ground

Rear turn signal light LH signal

Engine switch on (IG), LH turn indicator light off

Below 1 V

Engine switch on (IG), LH turn indicator light blinking

11 to 14 V ←→ Below 1 V

J11-6 (INT) - Body ground

L - Body ground

Tire pressure warning ECU and receiver signal

Engine switch on (IG)

8 to 15 V

Engine switch on (IG), steering pad switch assembly operated, "TPMS" selected on the multi-information display and "ENTER" switch (steering pad switch assembly) pressed and held

Below 1.5 V

J11-7 (LR) - Body ground

W - Body ground

Front and side turn signal light RH signal

Engine switch on (IG), RH turn indicator light off

Below 1 V

Engine switch on (IG), RH turn indicator light blinking

11 to 14 V ←→ Below 1 V

J11-8 (SW) - Body ground

B - Body ground

Turn signal switch signal

Engine switch on (IG), LH and RH turn signal switch off

11 to 14 V

Engine switch on (IG), LH or RH turn signal switch on

Below 1 V

J11-9 (TX-)

W

Local bus communication line

-

-

J11-10 (TX+)

LG

Local bus communication line

-

-

J11-11 (TRNL) - Body ground

G - Body ground

Rear turn signal light RH signal

Engine switch on (IG), RH turn indicator light off

Below 1 V

Engine switch on (IG), RH turn indicator light blinking

11 to 14 V ←→ Below 1 V

J11-12 (HAZM) - Body ground

P - Body ground

Hazard warning signal switch signal (Output)

Hazard warning signal switch not pressed

11 to 14 V

Hazard warning signal switch pressed

Below 1 V

J11-13 (LL) - Body ground

R - Body ground

Front and side turn signal light LH signal

Engine switch on (IG), LH turn indicator light off

Below 1 V

Engine switch on (IG), LH turn indicator light blinking

11 to 14 V ←→ Below 1 V

  • *1: w/ Rear No. 2 Seat
  • *2: for 60/40 Split Seat Type

(1) Waveform 1 (Reference):

Item

Condition

Tool setting

5 V/DIV., 20 ms./DIV.

Vehicle condition

Engine switch on (IG), wheel being rotated

HINT:

When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

(2) Waveform 2 (Reference):

Item

Condition

Tool setting

5 V/DIV., 20 ms./DIV.

Vehicle condition

Engine switch on (IG), fuel level full → low

HINT:

  • (A) will depending on the fuel level
  • Fuel level full → low (4.1 to 4.6 V → 0.3 to 1 V)

(3) Waveform 3 (Reference):

Item

Condition

Tool setting

2.5 V/DIV., 20 ms./DIV.

Condition

Engine switch on (IG)

Specified Condition

4.5 to 5.5 V

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