Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK OCCUPANT CLASSIFICATION ECU

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specification

Y2-1 (+B) - Y2-3 (GND)

W - W-B

Battery

Ignition switch ON

11 to 14 V

Y2-2 (DIA) - Y2-3 (GND)

GR - W-B

Diagnosis (DLC3)

Ignition switch ON

Pulse generation

Y2-3 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

Y2-4 (FSR-) - Y2-3 (GND)

Y - W-B

Center airbag sensor communication ground line

Always

Below 1 Ω

Y2-5 (BGND) - Y2-3 (GND)

P - W-B

Passenger side buckle switch ground line

Always

Below 1 Ω

Y2-7 (IG2) - Y2-3 (GND)

B - W-B

Power source (IGN fuse)

Ignition switch ON

11 to 14 V

Y2-8 (FSR+) - Y2-4 (FSR-)

L - Y

Center airbag sensor communication line

Ignition switch ON

Pulse generation

Y2-9 (BSW) - Y2-5 (BGND)

G - P

Passenger side buckle switch line

Ignition switch ON, buckle switch ON

0.12 to 0.18 A

Ignition switch ON, buckle switch OFF

0.4 to 0.7 mA

Y1-1 (SGD1) - Y2-3 (GND)

G - W-B

Front occupant detection sensor LH ground line

Always

Below 1 Ω

Y1-2 (SGD2) - Y2-3 (GND)

O - W-B

Front occupant detection sensor RH ground line

Always

Below 1 Ω

Y1-3 (SGD3) - Y2-3 (GND)

W - W-B

Rear occupant detection sensor LH ground line

Always

Below 1 Ω

Y1-4 (SGD4) - Y2-3 (GND)

BR - W-B

Rear occupant detection sensor RH ground line

Always

Below 1 Ω

Y1-11 (SVC1) - Y1-1 (SGD1)

R - G

Front occupant detection sensor LH power supply line

Ignition switch ON, load is applied to front occupant detection sensor LH

4.5 to 5.1 V

Y1-12 (SVC2) - Y1-2 (SGD2)

W - O

Front occupant detection sensor RH power supply line

Ignition switch ON, load is applied to front occupant detection sensor RH

4.5 to 5.1 V

Y1-5 (SVC3) - Y1-3 (SGD3)

GR - W

Rear occupant detection sensor LH power supply line

Ignition switch ON, load is applied to rear occupant detection sensor LH

4.5 to 5.1 V

Y1-6 (SVC4) - Y1-4 (SGD4)

V - BR

Rear occupant detection sensor RH power supply line

Ignition switch ON, load is applied to rear occupant detection sensor RH

4.5 to 5.1 V

Y1-7 (SIG1) - Y1-1 (SGD1)

P - G

Front occupant detection sensor LH signal line

Ignition switch ON, load is applied to front occupant detection sensor LH

Pulse generation

Y1-8 (SIG2) - Y1-2 (SGD2)

L - O

Front occupant detection sensor RH signal line

Ignition switch ON, load is applied to front occupant detection sensor RH

Pulse generation

Y1-9 (SIG3) - Y1-3 (SGD3)

Y - W

Rear occupant detection sensor LH signal line

Ignition switch ON, load is applied to rear occupant detection sensor LH

Pulse generation

Y1-10 (SIG4) - Y1-4 (SGD4)

B - BR

Rear occupant detection sensor RH signal line

Ignition switch ON, load is applied to rear occupant detection sensor RH

Pulse generation

  • If the result is not as specified, the ECU may have a malfunction.
    System Diagram

    Trouble in Passenger Airbag ON/OFF Indicator

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