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

(d) Install the main body ECU (multiplex network body ECU) to the driver side junction block assembly.

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(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

3J-41 (KSW) - Body ground

G - Body ground

Unlock warning switch assembly signal

No key in ignition key cylinder

11 to 14 V

Key in ignition key cylinder

Below 1 V

J165-6 (FLCY) - Body ground

GR - Body ground

Front door courtesy light switch LH input

Front door LH open

Below 1 V

Front door LH closed

Pulse generation

    System Diagram

    Power Door Lock Control System

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