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Home >> Lexus >> 2022 >> LS 500h AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Advanced Park) - Diagnostic Codes (5 Of 5) & Symptom Tests >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Advanced Park) >> DTC U0074-88: Control Module Communication Bus "B" Off Bus Off; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0110-87: Lost Communication with Drive Motor Control Module "A" 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 U0293-87: Lost Communication with Hybrid/EV Powertrain Control Module Missing Message; DTC U1107-87: Lost Communication with Power Management Module Missing Message; DTC U111A-87: Lost Communication with ECM/PCM "A" (ch2) Missing Message; DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message; DTC U1159-87: Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message; DTC U1308-57: Software Incompatibility with Pre-collision Control Module Invalid / Incompatible Software Component [11/2021 - 10/2023] >> Description

DTC U0074-88: Control Module Communication Bus "B" Off Bus Off; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0110-87: Lost Communication with Drive Motor Control Module "A" 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 U0293-87: Lost Communication with Hybrid/EV Powertrain Control Module Missing Message; DTC U1107-87: Lost Communication with Power Management Module Missing Message; DTC U111A-87: Lost Communication with ECM/PCM "A" (ch2) Missing Message; DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message; DTC U1159-87: Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message; DTC U1308-57: Software Incompatibility with Pre-collision Control Module Invalid / Incompatible Software Component [11/2021 - 10/2023]: Description

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

The No. 2 skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag ECU assembly), hybrid vehicle control ECU assembly, steering sensor, certification ECU (smart key ECU assembly), hybrid motor control inverter assembly, No. 1 skid control ECU (brake booster with master cylinder assembly), object recognition camera, airbag ECU assembly and ECM via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note
U0074-88 Control Module Communication Bus "B" Off Bus Off When the +BS terminal voltage is between 9.5 and 17.4 V, a delay in receiving data from the yaw rate sensor and steering sensor continues for 1 second or more. CAN communication line Comes on
  • SAE Code: U0074
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0100-87 Lost Communication with ECM/PCM "A" Missing Message When terminal IG2 voltage is 10 V or more, data cannot be received from the ECM for 2 seconds or more.
  • CAN communication line
  • ECM
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on
  • SAE Code: U0100
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0110-87 Lost Communication with Drive Motor Control Module "A" Missing Message When terminal IG1 voltage is 10 V or more and IGP_PT2 signal is on, data cannot be received from the hybrid motor control inverter assembly for 2 seconds or more.
  • CAN communication line
  • Hybrid motor control inverter assembly
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on
  • SAE Code: U0110
  • 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 ECU assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on
  • SAE Code: U0125
  • 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)
 Does not come on
  • SAE Code: U0126
  • 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)
 Comes on 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 ECU assembly for 5 seconds or more.
  • CAN communication line
  • Airbag ECU assembly
  • No. 2 skid control ECU (brake actuator assembly)
 Does not come on 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)
 Comes on
  • SAE Code: U025E
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0293-87 Lost Communication with Hybrid/EV Powertrain Control Module Missing Message When terminal IG1 voltage is 10 V or more and IGP_PT2 signal is on, data from the hybrid vehicle control ECU assembly cannot be received for 2 seconds or more.
  • CAN communication line
  • Hybrid vehicle control ECU assembly
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on
  • SAE Code: U0293
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U1107-87 Lost Communication with Power Management Module Missing Message When the voltage at terminal IG1 is 10 V or more, the certification ECU (smart key ECU assembly) cannot communicate for 3 seconds or more.
  • CAN communication line
  • Certification ECU (smart key ECU assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on
  • SAE Code: U1107
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U111A-87 Lost Communication with ECM/PCM "A" (ch2) Missing Message When terminal IG2 voltage is 10 V or more, data cannot be received from the ECM for 2 seconds or more.
  • CAN communication line
  • ECM
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on
  • SAE Code: U111A
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U1150-87 Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message When terminal IG1 voltage is 10 V or more and IGP_PT2 signal is on, data from the hybrid vehicle control ECU assembly cannot be received for 2 seconds or more.
  • CAN communication line
  • Hybrid vehicle control ECU assembly
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on
  • SAE Code: U1150
  • 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)
 Does not come on Output ECU: No. 2 skid control ECU (brake actuator assembly)
U1308-57 Software Incompatibility with Pre-collision Control Module Invalid / Incompatible Software Component Either of the following is detected:
  • The variation and destination information sent from the object recognition camera do not match the information stored in the No. 2 skid control ECU (brake actuator assembly).
  • No system information stored in the No. 2 skid control ECU (brake actuator assembly).
  • CAN communication line
  • Forward recognition camera*1
  • Object recognition camera*2
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
 Does not come on Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0125-87 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status When the +BS terminal voltage is between 9.5 and 17.4 V, data from the acceleration sensor cannot be received ◦ -
When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs:
- 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.

U0126-87 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status When the +BS terminal voltage is between 9.5 and 17.4 V, data from the steering sensor cannot be received ◦ -
When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs:
- Data from the steering 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.

U1308-57 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status The variation and destination information sent from the object recognition camera do not match the information stored in the No. 2 skid control ECU (brake actuator assembly) ◦ -
No system information stored in the No. 2 skid control ECU (brake actuator assembly) - ◦
Detection Time - -
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.

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