Toyota Avalon Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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(b) Reconnect the instrument panel junction block assembly connectors.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

MB-31 (BECU) - Body ground

-

Auxiliary battery power supply

Power switch off

11 to 14 V

MB-32 (IG) - Body ground

-

Ignition power supply (IG signal)

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

MB-30 (ACC) - Body ground

-

Ignition power supply (ACC signal)

Power switch on (ACC)

11 to 14 V

Power switch off

Below 1 V

MB-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

MB-2 (RCTY) - Body ground

-

Rear door courtesy light switch RH input

Rear door RH closed (OFF)

10 kΩ or higher

Rear door RH open (ON)

Below 1 Ω

MB-13 (LCTY) - Body ground

-

Rear door courtesy light switch LH input

Rear door LH closed (OFF)

10 kΩ or higher

Rear door LH open (ON)

Below 1 Ω

CHECK COMBINATION METER ASSEMBLY

(a) Disconnect the G16 combination meter assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G16-40 (B) - Body ground

LA-B - Body ground

Auxiliary battery power supply

Power switch off

11 to 14 V

G16-39 (IG+) - Body ground

GR - Body ground

Ignition power supply

Power switch off

Below 1 V

Power switch on (IG)

11 to 14 V

G16-21 (ES) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

G16-24 (RLSB) - Body ground

SB - Body ground

Rear LH seat belt buckle switch signal

Rear LH seat belt fastened

10 kΩ or higher

Rear LH seat belt unfastened

Below 1 Ω

G16-26 (RRSB) - Body ground

LG - Body ground

Rear RH seat belt buckle switch signal

Rear RH seat belt fastened

10 kΩ or higher

Rear RH seat belt unfastened

Below 1 Ω

G16-25 (RCSB) - Body ground

B - Body ground

Rear center seat belt buckle switch signal

Rear center seat belt fastened

10 kΩ or higher

Rear center seat belt unfastened

Below 1 Ω

(c) Reconnect the G16 combination meter assembly connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G16-18 (RLMT) - Body ground

BE - Body ground

Rear LH seat belt warning light output signal

Power switch on (IG), rear seat belt warning light (LH) off

11 to 14 V

Power switch on (IG), rear seat belt warning light (LH) on

Below 1 V

G16-20 (RRMT) - Body ground

G - Body ground

Rear center seat belt warning light output signal

Power switch on (IG), rear seat belt warning light (center) off

11 to 14 V

Power switch on (IG), rear seat belt warning light (center) on

Below 1 V

G16-19 (RCMT) - Body ground

R - Body ground

Rear RH seat belt warning light output signal

Power switch on (IG), rear seat belt warning light (RH) off

11 to 14 V

Power switch on (IG), rear seat belt warning light (RH) on

Below 1 V

AIRBAG ECU ASSEMBLY

Terminal No.

Terminal Symbol

Destination

K29-28

LBE+

Front seat inner belt assembly LH

K29-27

LBE-

Front seat inner belt assembly LH

CHECK OCCUPANT DETECTION ECU

(a) 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

R7-10 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 V

R7-6 (IG) - R7-10 (GND)

B - W-B

Power source

Power switch on (IG)

11 to 14 V

R7-9 (BGND) - R7-10 (GND)

P - W-B

Front passenger buckle switch ground

Always

Below 1 V

R7-7 (BSW) - R7-9 (BGND)

G - P

Front passenger buckle switch signal

Always

Pulse generation

R8-1 (SVC1) - R8-5 (SGD1)

R - G

Front occupant classification sensor LH power supply

Power switch on (IG)

11 to 14 V

R8-2 (SVC3) - R8-6 (SGD3)

GR - W

Rear occupant classification sensor LH power supply

Power switch on (IG)

11 to 14 V

R8-3 (SIG1) - R8-5 (SGD1)

P - G

Front occupant classification sensor LH signal

Power switch on (IG)

Pulse generation

R8-4 (SIG3) - R8-6 (SGD3)

Y - W

Rear occupant classification sensor LH signal

Power switch on (IG)

Pulse generation

R8-5 (SGD1) - R7-10 (GND)

G - W-B

Front occupant classification sensor LH ground

Always

Below 1 V

R8-6 (SGD3) - R7-10 (GND)

W - W-B

Rear occupant classification sensor LH ground

Always

Below 1 V

    System Diagram

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