Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Control Module Communication Bus "B" Off Bus Off (U007488,U010087,U010187,U012587,U012687,U015187)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Control Module Communication Bus "B" Off Bus Off (U007488,U010087,U010187,U012587,U012687,U015187)

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the ECM, steering angle sensor, yaw rate and acceleration sensor (for TFT Meter Type) and airbag sensor assembly via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U007488

Control Module Communication Bus "B" Off Bus Off

Any of the following is detected:

  • A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues for 1 second or more.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • A delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor occurs once or more within 5 seconds.

CAN communication system

U010087

Lost Communication with ECM/PCM "A" Missing Message

When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 15 km/h (9 mph), data cannot be received from the ECM for 2 seconds or more.
  • CAN communication system
  • ECM
  • Skid control ECU (brake actuator assembly)

U010187

Lost Communication with TCM Missing Message

When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 15 km/h (9 mph), data cannot be received from 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

Either of the following is detected:

  • When the +BS terminal voltage is between 9.5 and 17.4 V, data from the acceleration sensor cannot be received for 1second or more.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • Data from the acceleration sensor cannot be received once or more within 5 seconds.
  • CAN communication system
  • Acceleration sensor (airbag sensor assembly) (for Optitron Meter Type)
  • Acceleration sensor (yaw rate and acceleration sensor) (for TFT Meter Type)
  • Skid control ECU (brake actuator assembly)

U012687

Lost Communication with Steering Angle Sensor Module Missing Message

Either of the following is detected:

  • When the +BS terminal voltage is between 9.5 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • Data from the steering angle sensor cannot be received once or more within 5 seconds
  • CAN communication system
  • Steering angle sensor
  • Skid control ECU (brake actuator assembly)

U015187

Lost Communication with Restraints Control Module Missing Message

When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 7 km/h (4 mph), data cannot be received from the airbag sensor assembly for 5 seconds or more.
  • CAN communication system
  • Airbag sensor assembly
  • Skid control ECU (brake actuator assembly)
DTC Detection Conditions: U007488
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

When the +BS terminal voltage is between 9.5 and 17.4 V

-

○

○

Malfunction Status

A bus OFF state occurs once or more

○

-

-

A delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues

-

○

-

A delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor occurs once or more within 5 seconds

-

-

○

Detection Time

Within 0.1 seconds, 10 times in succession

1 second or more

10 times in succession within 60 seconds

Number of Trips

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

DTC Detection Conditions: U012587
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When the +BS terminal voltage is between 9.5 and 17.4 V

○

○

Malfunction Status

Data from the acceleration sensor cannot be received

○

-

Data from the acceleration sensor cannot be received once or more within 5 seconds

-

○

Detection Time

1 second or more

10 times in succession within 60 seconds

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: U012687
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When the +BS terminal voltage is between 9.5 and 17.4 V

○

○

Malfunction Status

Data from the steering angle sensor cannot be received

○

-

Data from the steering angle sensor cannot be received once or more within 5 seconds

-

○

Detection Time

1 second or more

10 times in succession within 60 seconds

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

PROCEDURE

1.

CLEAR DTC

(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.

NEXT

2.

RECONFIRM DTC

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

(b) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

Result

Proceed to

DTC (relating to CAN communication system) is output

A

DTC is not output

B

HINT:

If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for electronically controlled brake system) after the CAN communication system returns to normal.

Click here

A

INSPECT CAN COMMUNICATION SYSTEM

B

USE SIMULATION METHOD TO CHECK

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