Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK COMBINATION METER ASSEMBLY

(a) Disconnect the J28 combination meter assembly connector.

(b) Disconnect the J28 combination meter assembly connector.

(c) Measure the resistance and voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J28-2 (IG+) - Body ground

B - Body ground

Ignition power supply

(IG signal)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

J28-1 (B) - Body ground

LG - Body ground

Battery power supply

Always

11 to 14 V

J28-24 (ES) - Body ground

BR - Body ground

Ground

Always

Below 1 Ω

(d) Reconnect the J28 combination meter assembly connector.

(e) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J28-30 (SI) - Body ground

LG - Body ground

Speed signal (input)

Ignition switch ON, wheel turned slowly

Pulse generation

2. CHECK CENTER AIRBAG SENSOR ASSEMBLY

Terminal No.

Terminal Symbol

Destination

P20-28

LBE+

Front seat inner belt assembly LH

P20-27

LBE-

Front seat inner belt assembly LH

Q15-32

FSR+

Occupant detection ECU

Q15-31

FSR-

Occupant detection ECU

3. CHECK OCCUPANT DETECTION ECU

(a) Measure the voltage according to the value(s) in the table below.

HINT:

Since the occupant detection ECU uses waterproof connectors, the voltage and waveform cannot be inspected directly. Standard voltage readings and waveforms are indicated for reference only.

Terminal No. (Symbol)

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

    System Diagram

    Tongue Plate Stopper

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