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Home >> Lexus >> 2024 >> LX 600 F Sport >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (3 Of 3) & Symptom Tests >> Electronically Controlled Brake System >> DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0114-87: Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U025E-87: Lost Communication with Electronic Brake Booster Control Module "A" Missing Message; DTC U1159-87: Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message; DTC U115C-87: Lost Communication with ECM/PCM "A" (ch5) Missing Message [12/2021 - ] >> Description
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DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0114-87: Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U025E-87: Lost Communication with Electronic Brake Booster Control Module "A" Missing Message; DTC U1159-87: Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message; DTC U115C-87: Lost Communication with ECM/PCM "A" (ch5) Missing Message [12/2021 - ]: Description

The yaw rate and acceleration sensor has a built-in airbag sensor with ECU assembly.

The No. 2 skid control ECU (brake actuator assembly) receives signals from the ECM, TCM, 4 wheel drive control ECU, yaw rate and acceleration sensor (airbag sensor with ECU assembly), steering sensor, No. 1 skid control ECU (brake booster with master cylinder assembly) and airbag sensor with ECU assembly via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority Note
U0100-87 Lost Communication with ECM/PCM "A" Missing Message When data from the ECM cannot be received continuously for 2 seconds or more
  • CAN communication line
  • ECM
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0101-87 Lost Communication with TCM Missing Message When data from the TCM cannot be received continuously for 2 seconds or more
  • CAN communication line
  • TCM
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0114-87 Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V, data from the 4 wheel drive control ECU cannot be received for 1 second or more.
  • CAN communication line
  • 4 wheel drive control ECU
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0125-87 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V, data from the acceleration sensor cannot be received for 1 second or more.
  • CAN communication line
  • Yaw rate and acceleration sensor (airbag sensor with ECU assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0126-87 Lost Communication with Steering Angle Sensor Module Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V, data from the steering sensor cannot be received for 1 second or more.
  • CAN communication line
  • Steering sensor
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0140-87 Lost Communication with Body Control Module Missing Message When terminal IG1 voltage is 10 V or more, data from the main body ECU cannot be received for 2 seconds or more.
  • CAN communication line
  • Main body ECU (multiplex network body ECU)
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0151-87 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 with ECU assembly for 5 seconds or more.
  • CAN communication line
  • Airbag sensor with ECU assembly
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U025E-87 Lost Communication with Electronic Brake Booster Control Module "A" Missing Message When the voltage at terminal IG1 is 10 V or more, communication between the No. 1 skid control ECU (brake booster with master cylinder assembly) and No. 2 skid control ECU (brake actuator assembly) is not possible for 2 seconds or more.
  • CAN communication line
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U1159-87 Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message When the voltage at terminal IG1 is 10 V or more, communication between the No. 1 skid control ECU (brake booster with master cylinder assembly) and No. 2 skid control ECU (brake actuator assembly) is not possible for 2 seconds or more.
  • CAN communication line
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U115C-87 Lost Communication with ECM/PCM "A" (ch5) Missing Message When data from the ECM cannot be received continuously for 2 seconds or more
  • CAN communication line
  • ECM
  • No. 2 skid control ECU (brake actuator assembly)
 Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
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