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.

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(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

J165-6 (FLCY) - Body ground

GR - Body ground

Front courtesy light switch LH input

Front door LH closed (OFF) → open (ON)

10 kΩ or higher → Below 1 Ω

J165-27 (FRCY) - Body ground

W - Body ground

Front courtesy light switch RH input

Front door RH closed (OFF) → open (ON)

10 kΩ or higher → Below 1 Ω

A-13 (LCTY) - Body ground

None - Body ground

Rear courtesy light switch LH input

Rear door LH closed (OFF) → open (ON)

10 kΩ or higher → Below 1 Ω

A-2 (RCTY) - Body ground

None - Body ground

Rear courtesy light switch RH signal

Rear door RH closed (OFF) → open (ON)

10 kΩ or higher → Below 1 Ω

J165-11 (HCTY) - Body ground

R - Body ground

Engine hood courtesy switch input signal

Engine hood open (OFF) → closed (ON)

10 kΩ or higher → Below 1 Ω

A-3 (KSW) - Body ground

None - Body ground

Unlock warning switch assembly input

No key in ignition key cylinder → key in ignition key cylinder

10 kΩ or higher → Below 1 Ω

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

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(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

*: w/ Glass Breakage Sensor

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

J165-15 (IND) - Body ground

P - Body ground

Security indicator signal

Security indicator illuminates

3 to 10 V

3H-26 (SH) - Body ground

BE - Body ground

Security horn drive

Security horn sounding (Theft deterrent system is in alarm sounding state)

Pulse generation (Below 1 V ←→ 11 to 14 V)

J165-7 (GBS) - Body ground*

L - Body ground

Glass breakage sensor ECU signal

Armed state

Below 1 V

Glass breakage sensor ECU signal system is in alarm sounding state

Pulse generation

3H-27 (HORN) - Body ground

V - Body ground

Vehicle horn drive

Vehicle horns sounding (Theft deterrent system is in alarm sounding state)

Pulse generation (Below 1 V ←→ 11 to 14 V)

    System Diagram

    Theft Warning Ecu

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