Lexus ES manuals

Lexus ES: Control Module Communication Bus OFF (U0073,U0100,U0124,U0129,U0293)

Lexus ES (XZ10) Service Manual / Brake / Parking Brake / Electric Parking Brake System (for Hv Model) / Control Module Communication Bus OFF (U0073,U0100,U0124,U0129,U0293)

DESCRIPTION

The parking brake ECU (brake actuator assembly) communicates with the hybrid vehicle control ECU assembly, skid control ECU (brake booster with master cylinder assembly) and deceleration sensor (airbag ECU assembly) via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

U0073

Control Module Communication Bus OFF

Both of following conditions are met:

  • Power switch on (IG)
  • Bus is off (communication with other ECUs is not possible).

CAN communication system

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

U0100

Lost Communication With ECM/PCM "A"

Both of following conditions are met:

  • Vehicle being driven at 6 km/h (4 mph) or more.
  • Parking brake ECU (brake actuator assembly) cannot receive signals from the ECM for approximately 15 seconds.
  • CAN communication system
  • ECM

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

U0124

Lost Communication With Lateral Acceleration Sensor Module

Both of following conditions are met:

  • Vehicle is being driven at 6 km/h (4 mph) or more.
  • Parking brake ECU (brake actuator assembly) cannot receive signals from the deceleration sensor (airbag ECU assembly) for approximately 15 seconds.
  • CAN communication system
  • Deceleration sensor (Airbag ECU assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

U0129

Lost Communication with Brake System Control Module

Both of following conditions are met:

  • Power switch on (IG).
  • Parking brake ECU (brake actuator assembly) cannot receive signals from the skid control ECU (brake booster with master cylinder assembly) for approximately 15 seconds or 30 seconds (malfunction duration differs depending on the signal).
  • CAN communication system
  • Skid control ECU (brake booster with master cylinder assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

U0293

Lost Communication With Hybrid Vehicle Control System

Both of following conditions are met:

  • Vehicle being driven at 6 km/h (4 mph) or more.
  • Parking brake ECU cannot receive signals from the hybrid vehicle control ECU for approximately 15 seconds.
  • CAN communication system
  • Hybrid vehicle control ECU

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

PROCEDURE

1.

GO TO CAN COMMUNICATION SYSTEM

(a) Go to CAN communication system.

Click here

NEXT

END

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