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

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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(b) Reconnect the instrument panel junction block assembly connectors.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

MB-31 (BECU) - Body ground

-

Battery power supply

Always

11 to 14 V

MB-32 (IG) - Body ground

-

Ignition power supply (IG signal)

Engine switch on (IG) → off

11 to 14 V → Below 1 V

MB-30 (ACC) - Body ground

-

Ignition power supply (ACC signal)

Engine switch on (ACC) → off

11 to 14 V → Below 1 V

MB-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

MB-13 (LCTY) - Body ground

-

Rear door courtesy light switch LH input

Rear door LH closed (OFF)

10 kΩ or higher

Rear door LH open (ON)

Below 1 Ω

MB-2 (RCTY) - Body ground

-

Rear door courtesy light switch RH input

Rear door RH closed (OFF)

10 kΩ or higher

Rear door RH open (ON)

Below 1 Ω

CHECK COMBINATION METER ASSEMBLY

(a) Disconnect the J10 combination meter assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

w/o Rear No. 2 Seat

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J10-22 (B) - Body ground

G - Body ground

Battery power supply

Always

11 to 14 V

J10-21 (IG+) - Body ground

GR - Body ground

Ignition power supply

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

J10-31 (ES) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

J10-14 (RLSB) - Body ground

R - Body ground

Rear LH seat belt buckle switch signal

Rear LH seat belt fastened

10 kΩ or higher

Rear LH seat belt unfastened

Below 1 Ω

J10-13 (RCSB) - Body ground

B - Body ground

Rear center seat belt buckle switch signal

Rear center seat belt fastened

10 kΩ or higher

Rear center seat belt unfastened

Below 1 Ω

J10-12 (RRSB) - Body ground

W - Body ground

Rear RH seat belt buckle switch signal

Rear RH seat belt fastened

10 kΩ or higher

Rear RH seat belt unfastened

Below 1 Ω

w/ Rear No. 2 Seat

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J10-22 (B) - Body ground

G - Body ground

Battery power supply

Always

11 to 14 V

J10-21 (IG+) - Body ground

GR - Body ground

Ignition power supply

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

J10-31 (ES) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

J10-14 (RLSB) - Body ground

R - Body ground

Rear No. 1 LH seat belt buckle switch signal

Rear No. 1 LH seat belt fastened

10 kΩ or higher

Rear No. 1 LH seat belt unfastened

Below 1 Ω

J10-13 (RCSB) - Body ground*

B - Body ground

Rear No. 1 center seat belt buckle switch signal

Rear No. 1 center seat belt fastened

10 kΩ or higher

Rear No. 1 center seat belt unfastened

Below 1 Ω

J10-12 (RRSB) - Body ground

W - Body ground

Rear No. 1 RH seat belt buckle switch signal

Rear No. 1 RH seat belt fastened

10 kΩ or higher

Rear No. 1 RH seat belt unfastened

Below 1 Ω

J10-8 (RLBT) - Body ground

R - Body ground

Rear No. 2 LH seat belt buckle switch signal

Rear No. 2 LH seat belt fastened

10 kΩ or higher

Rear No. 2 LH seat belt unfastened

Below 1 Ω

J10-6 (RRBT) - Body ground

W - Body ground

Rear No. 2 RH seat belt buckle switch signal

Rear No. 2 RH seat belt fastened

10 kΩ or higher

Rear No. 2 RH seat belt unfastened

Below 1 Ω

  • *: for 60/40 Split Seat Type

(c) Reconnect the J10 combination meter assembly connector.

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

w/o Rear No. 2 Seat

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

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

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

w/ Rear No. 2 Seat

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J10-35 (RLMT) - Body ground

Y - Body ground

Rear seat belt warning light (rear No. 1 seat LH) output signal

Engine switch on (IG), rear seat belt warning light (rear No. 1 seat LH) off

11 to 14 V

Engine switch on (IG), rear seat belt warning light (rear No. 1 seat LH) on

Below 1 V

J10-36 (RCMT) - Body ground*

W - Body ground

Rear seat belt warning light (rear No. 1 seat center) output signal

Engine switch on (IG), rear seat belt warning light (rear No. 1 seat center) off

11 to 14 V

Engine switch on (IG), rear seat belt warning light (rear No. 1 seat center) on

Below 1 V

J10-37 (RRMT) - Body ground

B - Body ground

Rear seat belt warning light (rear No. 1 seat RH) output signal

Engine switch on (IG), rear seat belt warning light (rear No. 1 seat RH) off

11 to 14 V

Engine switch on (IG), rear seat belt warning light (rear No. 1 seat RH) on

Below 1 V

J10-32 (L) - Body ground

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

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

  • *: for 60/40 Split Seat Type

CHECK AIRBAG SENSOR ASSEMBLY

Terminal No.

Terminal Symbol

Destination

S100-28

LBE+

Front seat inner belt assembly LH

S100-27

LBE-

Front seat inner belt assembly LH

CHECK OCCUPANT DETECTION ECU

(a) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

B-10 (GND) - Body ground

-

Ground

Always

Below 1 V

B-6 (IG2) - B-10 (GND)

-

Power source

Engine switch on (IG)

11 to 14 V

B-9 (BGND) - B-10 (GND)

-

Front passenger buckle switch ground

Always

Below 1 V

B-7 (BSW) - B-9 (BGND)

-

Front passenger buckle switch signal

Always

Pulse generation

b10-1 (SVC1) - b10-5 (SGD1)

R - G

Front occupant classification sensor LH power supply

Engine switch on (IG)

11 to 14 V

b10-2 (SVC3) - b10-6 (SGD3)

GR - W

Rear occupant classification sensor LH power supply

Engine switch on (IG)

11 to 14 V

b10-3 (SIG1) - b10-5 (SGD1)

P - G

Front occupant classification sensor LH signal

Engine switch on (IG)

Pulse generation

b10-4 (SIG3) - b10-6 (SGD3)

SB - W

Rear occupant classification sensor LH signal

Engine switch on (IG)

Pulse generation

b10-5 (SGD1) - B-10 (GND)

G - -

Front occupant classification sensor LH ground

Always

Below 1 V

b10-6 (SGD3) - B-10 (GND)

W - -

Rear occupant classification sensor LH ground

Always

Below 1 V

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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