Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

*A

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

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*A

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

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

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

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

3F-1 - Body ground

W - Body ground

Battery power supply

Always

11 to 14 V

3K-1 - Body ground

B-R - Body ground

Battery power supply

Always

11 to 14 V

3D-3 - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

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

(d) 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

3A-30 - Body ground

LG - Body ground*1

G - Body ground*2

ACC power supply

Ignition switch ACC

11 to 14 V

Ignition switch off

Below 1 V

3A-17 - Body ground

GR - Body ground

IG power supply

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

3D-24*3 - Body ground

L - Body ground

Door ambient illumination light RH power supply

Always

11 to 14 V

3D-25*3 - Body ground

G - Body ground

Door ambient illumination light LH power supply

Always

11 to 14 V

3D-26*3 - Body ground

P - Body ground

No. 1 cup holder illumination light power supply

Always

11 to 14 V

3D-27*3 - Body ground

R - Body ground

No. 2 cup holder illumination light power supply

Always

11 to 14 V

3H-19 - Body ground

L - Body ground

No. 1 luggage compartment light power supply

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

3D-9 - Body ground

W - Body ground

Map light assembly, No. 1 room light and vanity lights power supply

DOME CUT relay on

11 to 14 V

DOME CUT relay off

Below 1 V

3D-29 - Body ground

G - Body ground

Interior lights drive output

Interior lights off (when operated by illuminated entry system)

11 to 14 V

Interior lights on (when operated by illuminated entry system)

Below 1 V

3H-24 - Body ground

BR - Body ground

Rear door courtesy light switch LH input

Rear door LH open

Below 1 V

Rear door LH closed

Pulse generation

3A-31 - Body ground

BR - Body ground

Rear door courtesy light switch RH input

Rear door RH open

Below 1 V

Rear door RH closed

Pulse generation

F15-6 (FLCY) - Body ground

R - Body ground

Front door courtesy light switch LH input

Front door LH open

Below 1 V

Front door LH closed

Pulse generation

F15-27 (FRCY) - Body ground

BR - Body ground

Front door courtesy light switch RH input

Front door RH open

Below 1 V

Front door RH closed

Pulse generation

3D-14*1 - Body ground

LG - Body ground

Rear door unlock detection switch input

Rear door locked

Pulse generation

Rear door unlocked

Below 1 V

3D-13 - Body ground

B - Body ground

Front door unlock detection switch LH input

Front door LH locked

Pulse generation

Front door LH unlocked

Below 1 V

3D-12 - Body ground

GR - Body ground

Front door unlock detection switch RH input

Front door RH locked

Pulse generation

Front door RH unlocked

Below 1 V

F15-25 (BCYL) - Body ground

Y - Body ground

No. 1 luggage compartment light drive output

No. 1 luggage compartment light off

11 to 14 V

No. 1 luggage compartment light on

Below 1 V

3H-34 - Body ground

SB - Body ground

Back door courtesy light switch input

Back door open

Below 1 V

Back door closed

11 to 14 V

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

  • *1: w/ Smart Key System
  • *2: w/o Smart Key System
  • *3: w/ Door Ambient Illumination Light

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Smart Key System)

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F1-10 (SWIL) - F1-11 (AGND)

LG - P

Engine switch illumination drive output

Engine switch illumination on

11 to 14 V

Engine switch illumination off

Below 1 V

  • If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.
    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE NOTICE: Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration*1. Click here *1: w/ ...

    Data List / Active Test
    DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the following table, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when de ...

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