Toyota 4Runner manuals

Toyota 4Runner: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY, MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


(a) Remove the main body ECU (multiplex network body ECU) (See page ).


(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

A-30 (BECU) - Body ground

-

Battery power supply

Always

11 to 14 V

A-31 (ALTB) - Body ground

-

Battery power supply

Always

11 to 14 V

A-32 (IG) - Body ground

-

Engine switch power supply

Engine switch on (IG)

11 to 14 V

A-32 (IG) - Body ground

-

Engine switch power supply

Engine switch off

Below 1 V

A-29 (ACC) - Body ground

-

ACC power supply

Engine switch on (ACC)

11 to 14 V

A-29 (ACC) - Body ground

-

ACC power supply

Engine switch off

Below 1 V

A-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

F10-3 (GND2) - 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) Install the main body ECU (multiplex network body ECU) (See page ).


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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

2F-27 (FLCY) - Body ground

R - Body ground

Front door LH courtesy switch input

Front door LH open

Below 1 V

2F-27 (FLCY) - Body ground

R - Body ground

Front door LH courtesy switch input

Front door LH closed

11 to 14 V

2B-15 (FRCY) - Body ground

B - Body ground

Front door RH courtesy switch input

Front door RH open

Below 1 V

2B-15 (FRCY) - Body ground

B - Body ground

Front door RH courtesy switch input

Front door RH closed

11 to 14 V

F8-3 (LCTY) - Body ground

V - Body ground

Rear door LH courtesy light switch input

Rear door LH open

Below 1 V

F8-3 (LCTY) - Body ground

V - Body ground

Rear door LH courtesy light switch input

Rear door LH closed

11 to 14 V

F10-27 (RCTY) - Body ground

R - Body ground

Rear door RH courtesy light switch input

Rear door RH open

Below 1 V

F10-27 (RCTY) - Body ground

R - Body ground

Rear door RH courtesy light switch input

Rear door RH closed

11 to 14 V

F9-7 (LSFL) - Body ground

G - Body ground

Front door LH lock position switch input

Front door LH unlocked

Below 1 V

F9-7 (LSFL) - Body ground

G - Body ground

Front door LH lock position switch input

Engine switch off, all doors closed and front door LH locked

Pulse generation (see waveform 1 or 2)

F9-18 (LSFR) - Body ground

G - Body ground

Front door RH lock position switch input

Front door RH unlocked

Below 1 V

F9-18 (LSFR) - Body ground

G - Body ground

Front door RH lock position switch input

Engine switch off, all doors closed and front door RH locked

Pulse generation (see waveform 3 or 4)

2F-25 (LSWL) - Body ground

V - Body ground

Rear door LH lock position switch input

Rear door LH unlocked

Below 1 V

2F-25 (LSWL) - Body ground

V - Body ground

Rear door LH lock position switch input

Engine switch off, all doors closed and rear door LH locked

Pulse generation (see waveform 5 or 6)

F10-2 (LSWR) - Body ground

V - Body ground

Rear door RH lock position switch input

Rear door RH unlocked

Below 1 V

F10-2 (LSWR) - Body ground

V - Body ground

Rear door RH lock position switch input

Engine switch off, all doors closed and rear door RH locked

Pulse generation (see waveform 7 or 8)

2D-13 (BZR) - Body ground

GR - Body ground

Wireless door lock buzzer signal

Wireless door lock buzzer off

Below 1 V

2D-13 (BZR) - Body ground

GR - Body ground

Wireless door lock buzzer signal

Wireless door lock buzzer on

11 to 14 V

F9-3 (HAZ) - Body ground

W - Body ground

Hazard warning signal light signal output

Hazard warning signal switch off

Below 1 V

F9-3 (HAZ) - Body ground

W - Body ground

Hazard warning signal light signal output

Hazard warning signal switch on

11 to 14 V

If the result is not as specified, the main body ECU (multiplex network body ECU) or driver side junction block assembly may have a malfunction.

(e) Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item

Content

Terminal No. (Symbol)

F9-7 (LSFL) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Ignition switch off, all doors closed and front door LH locked

(f) Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item

Content

Terminal No. (Symbol)

F9-7 (LSFL) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Ignition switch off, all doors closed and front door LH locked

(g) Using an oscilloscope, check waveform 3.

Waveform 3 (Reference)

Item

Content

Terminal No. (Symbol)

F9-18 (LSFR) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Ignition switch off, all doors closed and front door RH locked

(h) Using an oscilloscope, check waveform 4.

Waveform 4 (Reference)

Item

Content

Terminal No. (Symbol)

F9-18 (LSFR) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Ignition switch off, all doors closed and front door RH locked

(i) Using an oscilloscope, check waveform 5.

Waveform 5 (Reference)

Item

Content

Terminal No. (Symbol)

2F-25 (LSWL) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Ignition switch off, all doors closed and rear door LH locked

(j) Using an oscilloscope, check waveform 6.

Waveform 6 (Reference)

Item

Content

Terminal No. (Symbol)

2F-25 (LSWL) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Ignition switch off, all doors closed and rear door LH locked

(k) Using an oscilloscope, check waveform 7.

Waveform 7 (Reference)

Item

Content

Terminal No. (Symbol)

F10-2 (LSWR) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Ignition switch off, all doors closed and rear door RH locked

(l) Using an oscilloscope, check waveform 8.

Waveform 8 (Reference)

Item

Content

Terminal No. (Symbol)

F10-2 (LSWR) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Ignition switch off, all doors closed and rear door RH locked

2. CHECK MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)


(a) Disconnect the V2 multiplex network door ECU (back door P/W) connector.

(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

V2-1 (BDR) - Body ground

B - Body ground

Battery power supply

Always

11 to 14 V

V2-7 (BECU) - Body ground

L - Body ground

Battery power supply

Always

11 to 14 V

V2-8 (SIG) - Body ground

G - Body ground

Engine switch power supply

Engine switch on (IG)

11 to 14 V

V2-8 (SIG) - Body ground

G - Body ground

Engine switch power supply

Engine switch off

Below 1 V

V2-6 (GND) - 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 V2 multiplex network door ECU (back door P/W) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

W10-10 (BDCY) - W10-18 (CTYE)

P - G

Back door courtesy switch input

Back door closed

Pulse generation (see waveform 1 or 2)

W10-10 (BDCY) - W10-18 (CTYE)

P - G

Back door courtesy switch input

Back door open

Below 1 V

If the result is not as specified, the multiplex network door ECU (back door P/W) may have a malfunction.

(e) Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item

Content

Terminal No. (Symbol)

W10-10 (BDCY) - W10-18 (CTYE)

Tool Setting

5 V/DIV., 10 ms/DIV.

Condition

Back door closed

(f) Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item

Content

Terminal No. (Symbol)

W10-10 (BDCY) - W10-18 (CTYE)

Tool Setting

5 V/DIV., 10 ms/DIV.

Condition

Back door closed

3. CHECK CERTIFICATION ECU


(a) Disconnect the F79 certification ECU connector.

(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

F79-1 (+B) - F79-15 (E)

V - W-B

+B power supply

Always

11 to 14 V

F79-15 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

F79-16 (IG) - F79-15 (E)

W - W-B

IG power supply

Engine switch off → Engine switch on (IG)

Below 1 V → 11 to 14 V

F79-17 (CUTB) - F79-15 (E)

L - W-B

+B power supply

Always

11 to 14 V

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

(c) Reconnect the F79 certification ECU connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F78-5 (RCO) - F79-15 (E)

L - W-B

Door control receiver power source

Engine switch off, all doors closed and transmitter switch not pressed → pressed

Below 1 V → 4.5 to 5.5 V

F78-15 (RDA) - F79-15 (E)

G - W-B

Door control receiver data input signal

Engine switch off

11 to 14 V pulse generation at regular intervals

F78-16 (RSSI) - F79-15 (E)

P - W-B

Door control receiver electric wave existence signal

All doors locked, all doors closed and transmitter switch not pressed → pressed

11 to 14 V → Below 2 V

  • If the result is not as specified, the certification ECU may have a malfunction.
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