LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis (Single Page) >> Restraints >> Seat Belts >> Seat Belt System - Diagnostic Codes & Circuit Tests >> Seat Belt System >> DTC U0075-88: Control Module Communication Bus "C" Off Bus Off; DTC U0129-87: Lost Communication With Brake System Control 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 U1173-87: Lost Communication with Pre-Collision Control Module Missing Message; DTC U1184-87: Lost Communication with Advanced Drive Control Module Missing Message [10/2020 - 11/2021] >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC U0075-88: Control Module Communication Bus "C" Off Bus Off; DTC U0129-87: Lost Communication With Brake System Control 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 U1173-87: Lost Communication with Pre-Collision Control Module Missing Message; DTC U1184-87: Lost Communication with Advanced Drive Control Module Missing Message [10/2020 - 11/2021]: Description

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Note
U0075-88 Control Module Communication Bus "C" Off Bus Off Bus off condition is detected 25 times or more CAN communication failure PCS Warning Light:
Blinks
"Active Assist for Seat Belt Malfunction Visit Your Dealer" is displayed on the multi information display (in the combination meter assembly)
U0129-87 Lost Communication With Brake System Control Module Missing Message w/o Advanced Drive 
  1. Communication is lost between the seat belt control ECU and the skid control ECU assembly for approximately 3 seconds or more

w/ Advanced Drive 

  1. Communication is lost between the seat belt control ECU and the brake actuator assembly (No. 2 skid control ECU) for approximately 3 seconds or more
CAN communication failure PCS Warning Light:
Blinks
"Active Assist for Seat Belt Malfunction Visit Your Dealer" is displayed on the multi information display (in the combination meter assembly)
U0140-87 Lost Communication with Body Control Module Missing Message Communication is lost between the seat belt control ECU and the main body ECU (multiplex network body ECU) for approximately 6 seconds or more CAN communication failure PCS Warning Light:
Blinks
"Active Assist for Seat Belt Malfunction Visit Your Dealer" is displayed on the multi information display (in the combination meter assembly)
U0151-87 Lost Communication with Restraints Control Module Missing Message Communication is lost between the seat belt control ECU and the airbag ECU assembly for approximately 6 seconds or more CAN communication failure PCS Warning Light:
Blinks
"Active Assist for Seat Belt Malfunction Visit Your Dealer" is displayed on the multi information display (in the combination meter assembly)
U1173-87 Lost Communication with Pre-Collision Control Module Missing Message Communication is lost between the seat belt control ECU and the driving support ECU for approximately 2 seconds or more CAN communication failure PCS Warning Light:
Blinks
"Active Assist for Seat Belt Malfunction Visit Your Dealer" is displayed on the multi information display (in the combination meter assembly)
U1184-87 Lost Communication with Advanced Drive Control Module Missing Message Communication is lost between the seat belt control ECU and the advanced drive ECU assembly for approximately 2 seconds or more CAN communication failure PCS Warning Light:
Blinks
"Active Assist for Seat Belt Malfunction Visit Your Dealer" is displayed on the multi information display (in the combination meter assembly)