Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

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

*A

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

-

-

*1

Main Body ECU (Multiplex Network Body ECU)

-

-

*a

2 Connectors

-

-

*A

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

-

-

*1

Main Body ECU (Multiplex Network Body ECU)

-

-

*a

1 Connector

-

-

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

Click here

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

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

MB-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

MB-31 (BECU) - Body ground

-

Battery power supply

Always

11 to 14 V

MB-30 (ACC) - Body ground

-

ACC power supply

Ignition switch ACC

11 to 14 V

MB-30 (ACC) - Body ground

-

ACC power supply

Ignition switch off

Below 1 V

MB-32 (IG) - Body ground

-

IG power supply

Ignition switch ON

11 to 14 V

MB-32 (IG) - Body ground

-

IG power supply

Ignition switch off

Below 1 V

(d) Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

Click here

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

3H-8 (ACT-) - Body ground

LA-B - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder off

Below 1 V

3H-8 (ACT-) - Body ground

LA-B - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder unlocked

11 to 14 V

3H-9 (ACT-) - Body ground

B - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder off

Below 1 V

3H-9 (ACT-) - Body ground

B - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder unlocked

11 to 14 V

3H-6 (ACT+) - Body ground

R - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder off

Below 1 V

3H-6 (ACT+) - Body ground

R - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder locked

11 to 14 V

3H-18 (ACT+) - Body ground

R - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder off

Below 1 V

3H-18 (ACT+) - Body ground

R - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder locked

11 to 14 V

3D-4 (ACTD) - Body ground

B - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder off → on (unlock)

Below 1 V → 11 to 14 V → Below 1 V

F15-6 (FLCY) - Body ground

R - Body ground

Front door courtesy light switch (for LH) input

Front door LH open

Below 1 V

F15-6 (FLCY) - Body ground

R - Body ground

Front door courtesy light switch (for LH) input

Front door LH closed

Pulse generation

F15-27 (FRCY) - Body ground

BR - Body ground

Front door courtesy light switch (for RH) input

Front door RH open

Below 1 V

F15-27 (FRCY) - Body ground

BR - Body ground

Front door courtesy light switch (for RH) input

Front door RH closed

Pulse generation

3H-24 (LCTY) - Body ground

BR - Body ground

Rear door courtesy light switch (for LH) input

Rear door LH open

Below 1 V

3H-24 (LCTY) - Body ground

BR - Body ground

Rear door courtesy light switch (for LH) input

Rear door LH closed

Pulse generation

3A-31 (RCTY) - Body ground

BR - Body ground

Rear door courtesy light switch (for RH) input

Rear door RH open

Below 1 V

3A-31 (RCTY) - Body ground

BR - Body ground

Rear door courtesy light switch (for RH) input

Rear door RH closed

Pulse generation

3D-13 (LSFL) - Body ground

B - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

3D-13 (LSFL) - Body ground

B - Body ground

Front door LH unlock detection switch input

Front door LH locked

Pulse generation

3D-12 (LSFR) - Body ground

GR - Body ground

Front door RH unlock detection switch input

Front door RH unlocked

Below 1 V

3D-12 (LSFR) - Body ground

GR - Body ground

Front door RH unlock detection switch input

Front door RH locked

Pulse generation

3D-14 (LSR) - Body ground

LG - Body ground

Rear door LH/RH unlock detection switch input

Rear door LH or RH unlocked

Below 1 V

3D-14 (LSR) - Body ground

LG - Body ground

Rear door LH/RH unlock detection switch input

Rear door LH and RH locked

Pulse generation

F15-5 (PRG) - Body ground

GR - Body ground

Signal output to door control and tire pressure monitoring system receiver assembly

Key inserted into ignition key cylinder → Key pulled out of ignition key cylinder

11 to 14 V → Pulse generation → 11 to 14 V

F15-4 (RDA) - Body ground

LG - Body ground

Signal input from door control and tire pressure monitoring system receiver assembly

Ignition switch off, all doors closed and door control transmitter assembly switch not pressed

11 to 14 V

Ignition switch off, all doors closed and door control transmitter assembly switch pressed

Pulse generation

(0 to 12 V)

3A-41 (KSW) - Body ground

V - Body ground

Key unlock warning switch input

No key in ignition key cylinder

Pulse generation

3A-41 (KSW) - Body ground

V - Body ground

Key unlock warning switch input

Key in ignition key cylinder

Below 1 V

3F-29 (BZR) - Body ground*1

L - Body ground

Wireless door lock buzzer signal

Wireless door lock buzzer off

Below 1 V

3F-29 (BZR) - Body ground*1

L - Body ground

Wireless door lock buzzer signal

Wireless door lock buzzer on

Pulse generation

  • *1: w/ Toyota Safety Sense P

If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.

CHECK DOOR CONTROL AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY

(a) Disconnect the M23 door control and tire pressure monitoring system receiver assembly.

(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 connectors disconnected.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

M23-7 (+B) - Body ground

R - Body ground

Battery power supply

Always

11 to 14 V

M23-12 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the M23 door control and tire pressure monitoring system receiver assembly.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

M23-5 (PRG) - M23-12 (GND)

W - W-B

Signal input from main body ECU (multiplex network body ECU)

Key inserted into ignition key cylinder → Key pulled out of ignition key cylinder

11 to 14 V → Pulse generation → 11 to 14 V

M23-4 (RDA) - M23-12 (GND)

G - W-B

Signal output to main body ECU (multiplex network body ECU)

Ignition switch off, all doors closed and door control transmitter assembly switch not pressed

11 to 14 V

Ignition switch off, all doors closed and door control transmitter assembly switch pressed

Pulse generation

(0 to 12 V)

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