Toyota 4Runner manuals

Toyota 4Runner: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK COMBINATION METER ASSEMBLY


(a) Disconnect the F14 combination meter assembly connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F14-15 (B) - Body ground

L - Body ground

Battery power supply

Always

11 to 14 V

F14-17 (IG+) - Body ground

R - Body ground

Ignition switch power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

F14-20 (E1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

2. CHECK CENTER AIRBAG SENSOR ASSEMBLY


Terminal No.

Symbol

Description

O1-10

LBE+

Front seat inner belt assembly LH (Seat belt buckle switch LH)

O1-18

LBE-

Front seat inner belt assembly LH (Seat belt buckle switch LH)

N1-16

FSR+

Occupant detection ECU

N1-24

FSR-

Occupant detection ECU

3. CHECK OCCUPANT DETECTION ECU


Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

a9-1 (+B) - a9-3 (GND)

W - W-B

Battery power supply

Always

11 to 14 V

a9-2 (DIA) - a9-3 (GND)

GR - W-B

Diagnosis (DLC3)

Ignition switch ON

Pulse generation

a9-3 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 V

a9-4 (FSR-) - a9-3 (GND)

LG - W-B

Center airbag sensor assembly communication line

Always

Below 1 V

a9-5 (BGND) - a9-3 (GND)

P - W-B

Front passenger side buckle switch ground line

Always

Below 1 V

a9-7 (IG2) - a9-3 (GND)

B - W-B

Ignition switch power supply

Ignition switch ON

11 to 14 V

a9-8 (FSR+) - a9-4 (FSR-)

L - LG

Center airbag sensor assembly communication line

Ignition switch ON

Pulse generation

a9-9 (BSW) - a9-5 (BGND)

G - P

Front passenger side buckle switch line

Always

Pulse generation

a10-1 (SGD1) - a9-3 (GND)

G - W-B

Front occupant classification sensor LH ground line

Always

Below 1 V

a10-2 (SGD2) - a9-3 (GND)

LG - W-B

Front occupant classification sensor RH ground line

Always

Below 1 V

a10-3 (SGD3) - a9-3 (GND)

W - W-B

Rear occupant classification sensor LH ground line

Always

Below 1 V

a10-4 (SGD4) - a9-3 (GND)

BR - W-B

Rear occupant classification sensor RH ground line

Always

Below 1 V

a10-11 (SVC1) - a10-1 (SGD1)

R - G

Front occupant classification sensor LH power supply line

Ignition switch ON, load applied to front occupant classification sensor LH

4.9 to 5.1 V

a10-12 (SVC2) - a10-2 (SGD2)

W - LG

Front occupant classification sensor RH power supply line

Ignition switch ON, load applied to front occupant classification sensor RH

4.9 to 5.1 V

a10-5 (SVC3) - a10-3 (SGD3)

GR - W

Rear occupant classification sensor LH power supply line

Ignition switch ON, load applied to rear occupant classification sensor LH

4.9 to 5.1 V

a10-6 (SVC4) - a10-4 (SGD4)

V - BR

Rear occupant classification sensor RH power supply line

Ignition switch ON, load applied to rear occupant classification sensor RH

4.9 to 5.1 V

a10-7 (SIG1) - a10-1 (SGD1)

P - G

Front occupant classification sensor LH signal line

Ignition switch ON, load applied to front occupant classification sensor LH

0 to 5.1 V

a10-8 (SIG2) - a10-2 (SGD2)

L - LG

Front occupant classification sensor RH signal line

Ignition switch ON, load applied to front occupant classification sensor RH

0 to 5.1 V

a10-9 (SIG3) - a10-3 (SGD3)

SB - W

Rear occupant classification sensor LH signal line

Ignition switch ON, load applied to rear occupant classification sensor LH

0 to 5.1 V

a10-10 (SIG4) - a10-4 (SGD4)

B - BR

Rear occupant classification sensor RH signal line

Ignition switch ON, load applied to rear occupant classification sensor RH

0 to 5.1 V

If the result is not as specified, the occupant detection ECU may have a malfunction.

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