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.

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 off

Below 1 V

Ignition switch ON

11 to 14 V

MB-30 (ACC) - Body ground

-

Ignition power supply (ACC signal)

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

MB-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

F15-6 (FLCY) - Body ground

R - Body ground

Front door courtesy light switch assembly LH input

Front door LH closed

10 kΩ or higher

Front door LH open

Below 1 Ω

F15-27 (FRCY) - Body ground

BR - Body ground

Front door courtesy light switch assembly RH input

Front door RH closed

10 kΩ or higher

Front door RH open

Below 1 Ω

MB-13 (LCTY) - Body ground

-

Rear door courtesy light switch assembly LH input

Rear door LH closed

10 kΩ or higher

Rear door LH open

Below 1 Ω

MB-2 (RCTY) - Body ground

-

Rear door courtesy light switch assembly RH input

Rear door RH closed

10 kΩ or higher

Rear door RH open

Below 1 Ω

MB-4 (BCTY) - Body ground

-

Back door courtesy light switch input

Back door closed

10 kΩ or higher

Back door open

Below 1 Ω

F15-11 (HCTY) - Body ground

GR - Body ground

Hood courtesy switch input

Hood open

10 kΩ or higher

Hood closed

Below 1 Ω

MB-3 (KSW) - Body ground*1

-

Unlock warning switch signal

No key in ignition key cylinder

10 kΩ or higher

Key in ignition key cylinder

Below 1 Ω

  • *1: w/o Smart Key System

(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

3D-13 (LSFL) - Body ground

B - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

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

Front door RH locked

Pulse generation

F15-29 (L2) - Body ground

G - Body ground

Driver door key-linked lock input

Driver door key cylinder turned to lock position

Below 1 V

Driver door key cylinder off

Pulse generation

F15-2 (UL3) - Body ground

L - Body ground

Driver door key-linked unlock input

Driver door key cylinder turned to unlock position

Below 1 V

Driver door key cylinder off

Pulse generation

3D-14 (LSR) - Body ground

LG - Body ground

Rear door LH and Rear door RH unlock detection switch input

Rear door LH or Rear door RH unlocked

Below 1 V

Rear door LH and Rear door RH locked

Pulse generation

3A-20 (SH) - Body ground

LG - Body ground

Security horn assembly drive

Security horn assembly sounding

(Theft deterrent system in alarm sounding state)

Pulse generation

(Below 1 V ← → 11 to 14 V)

3F-27 (HORN) - Body ground

SB - Body ground

Vehicle horns drive

Vehicle horns sounding

(Theft deterrent system in alarm sounding state)

Pulse generation

(Below 1 V ← → 11 to 14 V)

    Problem Symptoms Table
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