Toyota Tundra Service Manual: 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) 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 ckeck for pulses according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

*1: w/o Jam Protection Function

*2: w/ Jam Protection Function

J165-2 (UL3) - Body ground

B - Body ground

Driver door key-linked unlock input

Driver door key cylinder turned to neutral position → on (unlock)

Pulse generation → Below 1 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

J165-29 (L2) - Body ground

L - Body ground

Driver door key-linked lock input

Driver door key cylinder turned to neutral position → on (lock)

Pulse generation → Below 1 V

3J-39 (UL1) - Body ground*1

GR - Body ground

Door control switch assembly input

Both door control switch assemblies off

Pulse generation

Either door control switch assembly on (unlock)

Below 1 V

3J-39 (UL1) - Body ground*2

GR - Body ground

Door control switch assembly input

Door control switch assembly RH off

Pulse generation

Door control switch assembly RH on (unlock)

Below 1 V

3I-16 (L1) - Body ground*1

B - Body ground

Door control switch assembly input

Both door control switch assemblies off

Pulse generation

Either door control switch assembly on (lock)

Below 1 V

3I-16 (L1) - Body ground*2

B - Body ground

Door control switch assembly input

Door control switch assembly RH off

Pulse generation

Door control switch assembly RH on (lock)

Below 1 V

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

11 to 14 V

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

    System Diagram

    Rear Door Lock(for Crewmax)

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