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Home >> Lexus >> 2009 >> LS 460 AWD >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Pre-Collision - Supplemental Restraint System >> Pre-Collision System >> DTC U0100 Lost Communication with ECM/PCM "A"; DTC U0122 Lost Communication with Vehicle Dynamics Control Module; DTC U0123 Lost Communication with Yaw Rate Sensor Module; DTC U0126 Lost Communication with Steering Angle Sensor Module; DTC U0140 Lost Communication with Main Body ECU; DTC U0151 Lost Communication with Airbag ECU; DTC U0235 Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1104 Lost Communication with Driving Support ECU >> Description
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DTC U0100 Lost Communication with ECM/PCM "A"; DTC U0122 Lost Communication with Vehicle Dynamics Control Module; DTC U0123 Lost Communication with Yaw Rate Sensor Module; DTC U0126 Lost Communication with Steering Angle Sensor Module; DTC U0140 Lost Communication with Main Body ECU; DTC U0151 Lost Communication with Airbag ECU; DTC U0235 Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1104 Lost Communication with Driving Support ECU: Description

The driving support ECU uses the front millimeter wave radar sensor to detect obstacles in front of and behind the vehicle, and detect the direction that the driver's head is facing. Based on this information, the driving support ECU sends pre-collision control operation signals.

This DTC is output when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-collision control.

DTC DETECTION CONDITION CHART

DTC Code DTC Detection Condition Trouble Area
U0100 While vehicle speed is 5 km/h (3 mph) or more, communication stop between ECM and driving support ECU continues for 1 sec. or more
  • ECM
  • CAN communication system
  • Driving support ECU
U0122 While engine switch is on (IG), communication stop between skid control ECU and driving support ECU or seat belt control ECU continues for 1 sec. or more
  • Skid control ECU
  • CAN communication system
  • Seat belt control ECU
  • Driving support ECU
U0123 While engine switch is on (IG), communication stop between yaw rate sensor and driving support ECU continues for 1 sec. or more
  • Yaw rate sensor
  • CAN communication system
  • Driving support ECU
U0126 While engine switch is on (IG), communication stop between steering angle sensor and driving support ECU continues for 1 sec. or more
  • Steering angle sensor
  • CAN communication system
  • Driving support ECU
U0140 While engine switch is on (IG), communication stop between main body ECU and driving support ECU continues for 1 sec. or more
  • Main body ECU
  • CAN communication system
  • Driving support ECU
U0151 While engine switch is on (IG), communication stop between center airbag sensor and driving support ECU continues for 1 sec. or more
  • Center airbag sensor
  • CAN communication system
  • Driving support ECU
U0235 While engine switch is on (IG), communication stop between front millimeter wave radar sensor and driving support ECU continues for 1 sec. or more
  • Front millimeter wave radar sensor
  • CAN communication system
  • Driving support ECU
U1104 While engine switch is on (IG), communication stop between driving support ECU and front millimeter wave radar sensor or seat belt control ECU continues for 1 sec. or more
  • Driving support ECU
  • CAN communication system
  • Front millimeter wave radar sensor
  • Seat belt control ECU
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