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 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.

HINT:

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

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 instrument panel junction block assembly.

Click here

(e) 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

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

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

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