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Home >> Lexus >> 2019 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (Ext) - Diagnostic Codes (3 Of 3), Symptom Tests & Circuit Tests (1 Of 2) >> Lighting System >> DTC U0073: Control Module Communication Bus "A" Off; DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0130: Lost Communication with Steering Effort Control Module; DTC U0132: Lost Communication with Ride Level Control Module; DTC U0134: Lost Communication with DRS Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0182: Lost Communication With Lighting Control Module Front; DTC U0242: Lost Communication With Headlamp Control Module "B" [12/2017 - 10/2020] >> Description
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DTC U0073: Control Module Communication Bus "A" Off; DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0130: Lost Communication with Steering Effort Control Module; DTC U0132: Lost Communication with Ride Level Control Module; DTC U0134: Lost Communication with DRS Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0182: Lost Communication With Lighting Control Module Front; DTC U0242: Lost Communication With Headlamp Control Module "B" [12/2017 - 10/2020]: Description

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
U0073 Control Module Communication Bus "A" Off The headlight ECU sub-assembly does not send/receive data. CAN communication system AFS -
U0100 Lost Communication with ECM / PCM "A" The headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
  • Headlight ECU sub-assembly LH
 AFS -
U0101 Lost Communication with TCM The headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
  • Headlight ECU sub-assembly LH
 AFS -
U0126 Lost Communication with Steering Angle Sensor Module The headlight ECU sub-assembly does not receive data from the steering sensor for approximately 10 seconds or more.
  • CAN communication system
  • Steering sensor
  • Headlight ECU sub-assembly LH
 AFS -
U0129 Lost Communication with Brake System Control Module
  • The headlight ECU sub-assembly LH does not receive data from the skid control ECU assembly for approximately 10 seconds or more.*1
  • The headlight ECU sub-assembly LH does not receive data from the brake actuator assembly (skid control ECU) for approximately 10 seconds or more.*2
  • CAN communication system
  • Skid control ECU assembly*1
  • Brake actuator assembly (skid control ECU)*2
  • Headlight ECU sub-assembly LH
 AFS -
U0130 Lost Communication with Steering Effort Control Module The headlight ECU sub-assembly LH does not receive data from the front steering control ECU for approximately 10 seconds or more
  • CAN communication system
  • Front steering control ECU
  • Headlight ECU sub-assembly LH
 AFS -
U0132 Lost Communication with Ride Level Control Module The headlight ECU sub-assembly LH does not receive data from the absorber control ECU for approximately 10 seconds or more
  • CAN communication system
  • Absorber control ECU
  • Headlight ECU sub-assembly LH
 AFS -
U0134 Lost Communication with DRS Module The headlight ECU sub-assembly LH does not receive data from the rear steering control ECU for approximately 10 seconds or more
  • CAN communication system
  • Rear steering control ECU
  • Headlight ECU sub-assembly LH
 AFS w/ Rear Dynamic Steering System
U0142 Lost Communication with Body Control Module "B" The headlight ECU sub-assembly does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Headlight ECU sub-assembly LH
 AFS -
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The headlight ECU sub-assembly does not receive data from the combination meter assembly circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Headlight ECU sub-assembly LH
 AFS -
U0182 Lost Communication With Lighting Control Module Front The headlight ECU sub-assembly RH does not receive data from the headlight ECU sub-assembly LH circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Headlight ECU sub-assembly RH
 AFS (Sub) -
U0242 Lost Communication With Headlamp Control Module "B" The headlight ECU sub-assembly LH does not receive data from the headlight ECU sub-assembly RH circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Headlight ECU sub-assembly LH
 AFS -
DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
U0073 Control Module Communication Bus "A" Off The headlight ECU sub-assembly does not send/receive data. CAN communication system AFS (Sub) -
U0100 Lost Communication with ECM / PCM "A" The headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
  • Headlight ECU sub-assembly LH
 AFS -
U0101 Lost Communication with TCM The headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
  • Headlight ECU sub-assembly LH
 AFS -
U0126 Lost Communication with Steering Angle Sensor Module The headlight ECU sub-assembly does not receive data from the steering sensor for approximately 10 seconds or more.
  • CAN communication system
  • Steering sensor
  • Headlight ECU sub-assembly RH
 AFS (Sub) -
U0129 Lost Communication with Brake System Control Module
  • The headlight ECU sub-assembly LH does not receive data from the skid control ECU assembly for approximately 10 seconds or more.*1
  • The headlight ECU sub-assembly LH does not receive data from the brake actuator assembly (skid control ECU) for approximately 10 seconds or more.*2
  • CAN communication system
  • Skid control ECU assembly*1
  • Brake actuator assembly (skid control ECU)*2
  • Headlight ECU sub-assembly LH
 AFS -
U0130 Lost Communication with Steering Effort Control Module The headlight ECU sub-assembly LH does not receive data from the front steering control ECU for approximately 10 seconds or more
  • CAN communication system
  • Front steering control ECU
  • Headlight ECU sub-assembly LH
 AFS -
U0132 Lost Communication with Ride Level Control Module The headlight ECU sub-assembly LH does not receive data from the absorber control ECU for approximately 10 seconds or more
  • CAN communication system
  • Absorber control ECU
  • Headlight ECU sub-assembly LH
 AFS -
U0134 Lost Communication with DRS Module The headlight ECU sub-assembly LH does not receive data from the rear steering control ECU for approximately 10 seconds or more
  • CAN communication system
  • Rear steering control ECU
  • Headlight ECU sub-assembly LH
 AFS w/ Rear Dynamic Steering System
U0142 Lost Communication with Body Control Module "B" The headlight ECU sub-assembly does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Headlight ECU sub-assembly RH
 AFS (Sub) -
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The headlight ECU sub-assembly does not receive data from the combination meter assembly circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Headlight ECU sub-assembly RH
 AFS (Sub) -
U0182 Lost Communication With Lighting Control Module Front The headlight ECU sub-assembly RH does not receive data from the headlight ECU sub-assembly LH circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Headlight ECU sub-assembly RH
 AFS (Sub) -
U0242 Lost Communication With Headlamp Control Module "B" The headlight ECU sub-assembly LH does not receive data from the headlight ECU sub-assembly RH circuit plate for approximately 10 seconds or more.
  • CAN communication system
  • Headlight ECU sub-assembly LH
 AFS -
  1. *1: w/o Vacuum Brake Booster
  2. *2: w/ Vacuum Brake Booster
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