Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

*a

Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

-

-

(a) Disconnect the A28 skid control ECU (brake actuator assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A28-1 (+BM) - Body ground

B - Body ground

Parking brake power supply

Always

11 to 14 V

A28-30 (+BS) - Body ground

G - Body ground

Parking brake motor power supply

Always

11 to 14 V

A28-36 (IG1) - Body ground

B - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

A28-46 (GND1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A28-14 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A28-2 (MRR+) - Body ground

Y - Body ground

Parking brake motor RH (parking brake actuator assembly RH) (+)

-

-

A28-3 (MRR-) - Body ground

L - Body ground

Parking brake motor RH (parking brake actuator assembly RH) (-)

-

-

A28-13 (MRL+) - Body ground

G - Body ground

Parking brake motor LH (parking brake actuator assembly LH) (+)

-

-

A28-12 (MRL-) - Body ground

W - Body ground

Parking brake motor LH (parking brake actuator assembly LH) (-)

-

-

A28-35 (POL) - Body ground

L - Body ground

Electric parking brake switch indicator light

-

-

A28-31 (SWI1) - Body ground

P - Body ground

Electric parking brake switch (electric parking brake switch assembly)

-

-

A28-15 (SWI2) - Body ground

W - Body ground

Electric parking brake switch (electric parking brake switch assembly)

-

-

A28-32 (SWO1) - Body ground

SB - Body ground

Electric parking brake switch (electric parking brake switch assembly)

-

-

A28-16 (SWO2) - Body ground

V - Body ground

Electric parking brake switch (electric parking brake switch assembly)

-

-

A28-5 (CANH) - Body ground

Y - Body ground

CAN communication line H

-

-

A28-19 (CANL) - Body ground

W - Body ground

CAN communication line L

-

-

    System Diagram

    Test Mode Procedure

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