Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

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

*A

Main Body ECU (Multiplex Network Body ECU) with 1 Connector

-

-

*A

Main Body ECU (Multiplex Network Body ECU) with 2 Connectors

-

-

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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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)

Ignition switch ON → off

11 to 14 V → Below 1 V

MB-30 (ACC) - Body ground

-

Ignition power supply (ACC signal)

Ignition switch ACC → off

11 to 14 V → Below 1 V

MB-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

MB-2 (RCTY) - Body ground

-

Rear door courtesy light switch RH input

Rear door LH closed (OFF)

10 kΩ or higher

Rear door LH open (ON)

Below 1 Ω

MB-13 (LCTY) - Body ground

-

Rear door courtesy light switch LH 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 F4 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.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F4-40 (B) - Body ground

SB - Body ground

Battery power supply

Always

11 to 14 V

F4-39 (IG+) - Body ground

P - Body ground

Ignition power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

F4-21 (ET) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

F4-10 (MSD) - Body ground

V - 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

F4-11 (MSTI) - Body ground

BE - 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

F4-13 (MSFM) - Body ground

R - 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

F4-3 (RRMT) - Body ground

W - Body ground

Rear RH seat belt warning light signal

Ignition switch ON, Rear RH seat belt unfastened within 34 seconds after closing rear door

Below 1 V

Ignition switch ON, Rear RH seat belt fastened within 34 seconds after closing rear door

11 to 14 V

F4-2 (RCMT) - Body ground

V - Body ground

Rear center seat belt warning light signal

Ignition switch ON, Rear center seat belt unfastened within 34 seconds after closing rear door

Below 1 V

Ignition switch ON, Rear center seat belt fastened within 34 seconds after closing rear door

11 to 14 V

F4-1 (RLMT) - Body ground

L - Body ground

Rear LH seat belt warning light signal

Ignition switch ON, Rear LH seat belt unfastened within 34 seconds after closing rear door

Below 1 V

Ignition switch ON, Rear LH seat belt fastened within 34 seconds after closing rear door

11 to 14 V

CHECK AIRBAG SENSOR ASSEMBLY

Terminal No.

Terminal Symbol

Destination

M1-10

LBE+

Front seat inner belt assembly LH

M1-18

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

Y6-10 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 V

Y6-6 (IG2) - Y6-10 (GND)

B - W-B

Power source

Ignition switch ON

11 to 14 V

Y6-9 (BGND) - Y6-10 (GND)

P - W-B

Front passenger buckle switch ground

Always

Below 1 V

Y6-7 (BSW) - Y6-9 (BGND)

G - P

Front passenger buckle switch signal

Always

Pulse generation

Y5-1 (SVC1) - Y5-5 (SGD1)

R - G

Front occupant classification sensor LH power supply

Ignition switch ON

11 to 14 V

Y5-2 (SVC3) - Y5-6 (SGD3)

GR - W

Rear occupant classification sensor LH power supply

Ignition switch ON

11 to 14 V

Y5-3 (SIG1) - Y5-5 (SGD1)

P - G

Front occupant classification sensor LH signal

Ignition switch ON

Pulse generation

Y5-4 (SIG3) - Y5-6 (SGD3)

SB - W

Rear occupant classification sensor LH signal

Ignition switch ON

Pulse generation

Y5-5 (SGD1) - Y6-10 (GND)

G - W-B

Front occupant classification sensor LH ground

Always

Below 1 V

Y5-6 (SGD3) - Y6-10 (GND)

W - W-B

Rear occupant classification sensor LH ground

Always

Below 1 V

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