Toyota Tundra Service Manual: Terminals Of Ecu

*1

Main Body ECU (Multiplex Network Body ECU)

-

-

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

*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

Terminal No. (Symbol)

J165-20 (CLTS) - Body ground

Tool Setting

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

Condition

Automatic light control system operating