Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

*1

Main Body ECU (Multiplex Network Body ECU)

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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.

Terminal No. (Symbol)

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

Body ground

Always

Below 1 Ω

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

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

*1: for LED Headlight

*2: w/ Fog Light

*3:w/ Automatic High Beam System

3H-31 (HRLY) - Body ground

B - Body ground

H-LP LO relay drive output

Light control switch in head position

Below 1 V

Light control switch not in head position

11 to 14 V

J165-1 (DIM) - Body ground

R - Body ground

DIMMER relay drive output

Headlight dimmer switch in high or high flash position

Below 1 V

Headlight dimmer switch not in high or high flash position

11 to 14 V

J165-3 (RLEW) - Body ground*1

L - Body ground

Light control ECU RH signal input

Ignition switch ON, light control switch in head position

Pulse generation

Ignition switch ON, light control switch off

11 to 14 V

J165-16 (LLEW) - Body ground*1

W - Body ground

Light control ECU LH signal input

Ignition switch ON, light control switch in head position

Pulse generation

Ignition switch ON, light control switch off

11 to 14 V

3H-28 (DRL) - Body ground

P - Body ground

DRL relay drive output

Daytime running light on

Below 1 V

Daytime running light off

11 to 14 V

3H-25 (FFGO) - Body ground*2

GR - Body ground

FGO FR relay drive output

Light control switch in tail or head position, fog light switch in front position

Below 1 V

Light control switch in tail or head position, fog light switch off

11 to 14 V

3H-32 - Body ground

V - Body ground

Front side marker lights, taillights, license plate lights drive output

Light control switch off

Below 1 V

Light control switch in tail or head position

11 to 14 V

J165-10 (HF) - Body ground

GR - Body ground

Headlight dimmer switch high flash position signal input

Headlight dimmer switch in high position

Below 1 V

Headlight dimmer switch not in high position

11 to 14 V

J165-24 (HU) - Body ground

V - Body ground

Headlight dimmer switch high position signal input

Headlight dimmer switch in high flash position

Below 1 V

Headlight dimmer switch not in high flash position

11 to 14 V

J165-8 (A) - Body ground

V - Body ground

Light control switch Auto position signal input

Light control switch in Auto position

Below 1 V

Light control switch not in Auto position

11 to 14 V

J165-12 (HEAD) - Body ground

G - Body ground

Light control switch head position input

Light control switch in head position

Below 1 V

Light control switch not in head position

11 to 14 V

J165-22 (TAIL) - Body ground

SB - Body ground

Light control switch tail position input

Light control switch in tail position

Below 1 V

Light control switch not in tail position

11 to 14 V

J165-26 (FFOG) - Body ground*2

R - Body ground

Fog light switch front position input

Fog light switch in front position

Below 1 V

Fog light switch off

11 to 14 V

J165-19 (CLTB) - J165-21 (CLTE)

B - R

Automatic light control sensor power supply output

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

J165-20 (CLTS) - Body ground

G - Body ground

Automatic light control sensor signal input

Ignition switch off

Below 1 V

Automatic light control system operating

Pulse generation

(See waveform 1)

3H-18 (PKB) - Body ground

BE - Body ground

Parking brake switch input

Parking brake switch on

Below 1 V

Parking brake switch off

11 to 14 V

J165-17 (AHBI) - Body ground*3

V - Body ground

Auto high beam main switch signal input

Auto high beam main switch on

Below 1 V

Auto high beam main switch off

11 to 14 V

J165-23 (CGSW) - Body ground

B - Body ground

Deck light switch assembly signal

Deck light switch assembly on

Below 1 V

Deck light switch assembly DOOR or off

11 to 14 V

3I-28 (RFGO) - Body ground

LG - Body ground

Deck light switch assembly signal

Deck light switch assembly off

Below 1 V

Deck light switch assembly on or DOOR

11 to 14 V

J165-6 (FLCY) - Body ground

GR - Body ground

Front door courtesy light switch assembly LH signal

Front door LH open

Below 1 V

Front door LH closed

Pulse generation

J165-27 (FRCY) - Body ground

W - Body ground

Front door courtesy light switch assembly RH signal

Front door RH open

Below 1 V

Front door RH closed

Pulse generation

3J-31 (RCTY) - Body ground

L - Body ground

Rear door courtesy light switch assembly RH signal

Rear door RH open

Below 1 V

Rear door RH closed

Pulse generation

3K-24 (LCTY) - Body ground

R - Body ground

Rear door courtesy light switch assembly LH signal

Rear door LH open

Below 1 V

Rear door LH closed

Pulse generation

3I-12 (LSFR) - Body ground

V - Body ground

Front door unlock detection switch RH signal

Front door RH unlocked

Below 1 V

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

Pulse generation

3I-13 (LSFL) - Body ground

L - Body ground

Front door unlock detection switch LH signal

Front door LH unlocked

Below 1 V

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

Pulse generation

3I-14 (LSWL) - Body ground

R - Body ground

Rear door unlock detection switch signal

Rear door LH or RH unlocked

Below 1 V

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

Pulse generation

3I-29 (ILE) - Body ground

W - Body ground

Interior lights drive output

Interior lights off (when operated by illuminated entry system)

11 to 14 V

Interior lights on (when operated by illuminated entry system)

Below 1 V

3I-9 - Body ground

B - Body ground

Interior light power supply

DOME CUT relay off

11 to 14 V

DOME CUT relay on

Below 1 V

(f) Waveform 1

Item

Content

Terminal No. (Symbol)

J165-20 (CLTS) - Body ground

Tool Setting

2 V/DIV., 10 ms./DIV.

Condition

Automatic light control system operating

HINT:

The communication waveform changes according to the surrounding brightness.

    Taillight Circuit

    Turn Signal Switch Circuit

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