Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

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

(a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

Click here

(b) Connect the driver side junction block assembly connectors.

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

A-32 (IG) - Body ground

None - Body ground

Ignition power supply

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

A-31 (BECU) - Body ground

None - Body ground

Battery power supply

Always

11 to 14 V

A-30 (ACC) - Body ground

None - Body ground

ACC power supply

Ignition switch ACC

11 to 14 V

Ignition switch off

Below 1 V

A-11 (GND1) - Body ground

None - Body ground

Ground

Always

Below 1 Ω

(d) Install the main body ECU (multiplex network body ECU).

Click here

(e) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

3H-29 (BZR) - Body ground

R - Body ground

Wireless door lock buzzer

Wireless door lock buzzer OFF → ON

Below 1 V → 11 to 14 V

J165-6 (FLCY) - Body ground

GR - Body ground

Front courtesy light switch LH input

Front door LH open

Below 1 V

Front door LH closed

Pulse generation

J165-27 (FRCY) - Body ground

W - Body ground

Front courtesy light switch RH input

Front door RH open

Below 1 V

Front door RH closed

Pulse generation

3I-1 (ACT-) - Body ground

LA-P - 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

3K-8 (ACT-) - Body ground

LA-R - 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

3I-2 (ACT+) - Body ground

W - Body ground

Door lock motor lock drive output

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

Below 1 V → 11 to 14 V → Below 1 V

3K-6 (ACT+) - Body ground

LA-B- Body ground

Door lock motor lock drive output

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

Below 1 V → 11 to 14 V → Below 1 V

3I-4 (ACTD) - Body ground

P - 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

3K-24 (LCTY) - Body ground

LA-R - Body ground

Rear courtesy light switch LH input

Rear door LH open

Below 1 V

Rear door LH closed

Pulse generation

3J-31 (RCTY) - Body ground

L - Body ground

Rear courtesy light switch RH signal

Rear door RH open

Below 1 V

Rear door RH closed

Pulse generation

3J-41 (KSW) - Body ground

G - Body ground

Unlock warning switch assembly input

Key in ignition key cylinder

Below 1 V

No key in ignition key cylinder

Pulse generation

3I-14 (LSWL) - Body ground

R - Body ground

Rear door unlock detection switch input

Either of rear door LH or RH unlocked

Below 1 V

Both of rear door LH and RH locked

Pulse generation

3I-12 (LSFR) - Body ground

V - Body ground

Front door RH unlock detection switch input

Front door RH unlocked

Below 1 V

Front door RH locked

Pulse generation

3I-13 (LSFL) - Body ground

L - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

Front door LH locked

Pulse generation

J165-4 (RDA) - Body ground

BE - Body ground

Signal input from door control receiver

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

J165-5 (PRG) - Body ground

LG - Body ground

Signal output to door control receiver

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

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

    System Diagram

    Engine Hood / Door

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