Lexus ES manuals

Lexus ES: Control Module Communication Bus "B" Off Bus Off (U007488,...,U015187)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Gasoline Model) / Control Module Communication Bus "B" Off Bus Off (U007488,...,U015187)

DESCRIPTION

The skid control ECU (brake actuator assembly) communicates with the following ECUs and sensors via CAN communication.

  • ECM
  • TCM (ECM)
  • Yaw rate and acceleration sensor (airbag ECU assembly)
  • Steering angle sensor
  • Power steering ECU (rack and pinion power steering gear assembly)
  • Main body ECU (multiplex network body ECU)
  • Airbag ECU assembly

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U007488

Control Module Communication Bus "B" Off Bus Off

The +BS terminal voltage is between 9.6 and a 16.5 V and a bus OFF state occurs for 0.1 seconds or more.

CAN communication system

U010087

Lost Communication with ECM/PCM "A" Missing Message

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals cannot be sent to the ECM for 2 seconds or more.
  • CAN communication system
  • ECM
  • Skid control ECU (brake actuator assembly)

U010187

Lost Communication with TCM Missing Message

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals cannot be sent to the TCM (ECM) for 2 seconds or more.
  • CAN communication system
  • TCM (ECM)
  • Skid control ECU (brake actuator assembly)

U012587

Lost Communication With Multi-axis Acceleration Sensor Module Missing Message

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the yaw rate and acceleration sensor (airbag ECU assembly) cannot be received for 1 second or more.
  • CAN communication system
  • Yaw rate and acceleration sensor (airbag ECU assembly)
  • Skid control ECU (brake actuator assembly)

U012687

Lost Communication with Steering Angle Sensor Module Missing Message

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the steering angle sensor cannot be received for 1 second or more.
  • CAN communication system
  • Steering angle sensor
  • Skid control ECU (brake actuator assembly)

U013187

Lost Communication With Power Steering Control Module Missing Message

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the power steering ECU (rack and pinion power steering gear assembly) cannot be received for 2 second or more.
  • CAN communication system
  • Power steering ECU (rack and pinion power steering gear assembly)
  • Skid control ECU (brake actuator assembly)

U014087

Lost Communication with Body Control Module Missing Message

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, data cannot be received from main body ECU (multiplex network body ECU) continuously for 2 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Skid control ECU (brake actuator assembly)

U015187

Lost Communication with Restraints Control Module Missing Message

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the airbag ECU assembly cannot be received for 5 seconds or more.
  • CAN communication system
  • Airbag ECU assembly
  • Skid control ECU (brake actuator assembly)

PROCEDURE

1.

CHECK DTC OUTPUT (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(d) Press the DTC clear button.

(e) Turn the engine switch off.

(f) Turn the engine switch on (IG).

(g) Enter the following menus: System Select / Health Check.

(h) Check for DTCs.

Result

Proceed to

DTCs for related systems are output together with DTC U007488, U010087, U010187, U012587, U012687, U013187, U014087 or U015187.

A

U007488, U010087, U010187, U012587, U012687, U013187, U014087 or U015187 is output.

B

DTCs are not output.

C
A

GO TO DIAGNOSTIC TROUBLE CODE CHART (RELATED SYSTEM)
B

INSPECT CAN COMMUNICATION SYSTEM

C

USE SIMULATION METHOD TO CHECK

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