Lexus ES manuals

Lexus ES: Terminals Of Ecu

TERMINALS OF ECU

CHECK PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

*a

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

-

-

(a) Disconnect the A54 parking brake 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

A54-9 (BEPB) - Body ground

R - Body ground

Parking brake power supply

Power switch off

11 to 14 V

A54-26 (IG) - Body ground

B - Body ground

IG power supply

Power switch on (IG)

8 to 16 V

A54-2 (EGND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A54-14 (SWI1) - Body ground

P - Body ground

Electric parking brake switch assembly

-

-

A54-24 (SWI2) - Body ground

W - Body ground

Electric parking brake switch assembly

-

-

A54-20 (SWO1) - Body ground

SB - Body ground

Electric parking brake switch assembly

-

-

A54-22 (SWO2) - Body ground

V - Body ground

Electric parking brake switch assembly

-

-

A54-4 (MRR+) - Body ground

LA-Y - Body ground

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

-

-

A54-3 (MRR-) - Body ground

LA-L - Body ground

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

-

-

A54-7 (MRL+) - Body ground

LA-G - Body ground

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

-

-

A54-8 (MRL-) - Body ground

LA-W - Body ground

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

-

-

A54-27 (SPD) - Body ground

L - Body ground

Vehicle speed direct input

-

-

A54-12 (CANH) - Body ground

B - Body ground

CAN communication line H

-

-

A54-11 (CANL) - Body ground

W - Body ground

CAN communication line L

-

-

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 Rear Sensor Communication Malfunction (C1AED)

DESCRIPTION This DTC is stored when there is an open or short circuit in the communication line between the rear sensors and the ECU, or when there is a malfunction in a rear sensor. DTC No. Detection Item DTC Detection Condition Trouble Area C1AED Rear Sensor Communication Malfunctio

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DESCRIPTION This DTC is stored when the blind spot monitor sensor RH judges that there is a communication problem with the blind spot monitor sensor LH. DTC No. Detection Item DTC Detection Condition Trouble Area U0232 Lost Communication with Blind Spot Monitor Slave Module The blin

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