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Home >> Lexus >> 2023 >> LX 600 Base >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System - Diagnostic Codes (3 Of 3), Circuit Tests And Symptom Tests >> Air Conditioning System >> DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0131-87: Lost Communication with Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0155-87: Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message; DTC U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0201-87: Lost Communication with "Door Control Module C" Missing Message; DTC U1114-87: Lost Communication with Driver Seat Switch Control Module Missing Message [12/2021 - ] >> Description
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DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0131-87: Lost Communication with Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0155-87: Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message; DTC U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0201-87: Lost Communication with "Door Control Module C" Missing Message; DTC U1114-87: Lost Communication with Driver Seat Switch Control Module Missing Message [12/2021 - ]: Description

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from Priority
U0100-87 Lost Communication with ECM/PCM "A" Missing Message Diagnosis Condition:
  1. IG voltage is 8.5 V or more

Malfunction Status:

  1. No communication with ECM

Detection Time:

  1. Continuously for 10 seconds or more
  • CAN communication system
  • ECM
  • Air conditioning amplifier assembly
 Memorized Air Conditioner B
U0131-87 Lost Communication with Power Steering Control Module Missing Message Diagnosis Condition:
  1. IG voltage is 8.5 V or more

Malfunction Status:

  1. No communication with power steering ECU assembly

Detection Time:

  1. Continuously for 10 seconds or more
  • CAN communication system
  • Power steering ECU assembly
  • Air conditioning amplifier assembly
 Memorized Air Conditioner B
U0140-87 Lost Communication with Body Control Module Missing Message Diagnosis Condition:
  1. IG voltage is 8.5 V or more

Malfunction Status:

  1. No communication with main body ECU (multiplex network body ECU)

Detection Time:

  1. Continuously for 10 seconds or more
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Air conditioning amplifier assembly
 Memorized Air Conditioner B
U0155-87 Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message Diagnosis Condition:
  1. IG voltage is 8.5 V or more

Malfunction Status:

  1. No communication with combination meter assembly

Detection Time:

  1. Continuously for 10 seconds or more
  • CAN communication system
  • Combination meter assembly
  • Air conditioning amplifier assembly
 Memorized Air Conditioner B
U0163-87 Lost Communication with Navigation Control Module Missing Message Diagnosis Condition:
  1. IG voltage is 8.5 V or more

Malfunction Status:

  1. No communication with radio and display receiver assembly

Detection Time:

  1. Continuously for 10 seconds or more
  • CAN communication system
  • Radio and display receiver assembly
  • Air conditioning amplifier assembly
 Memorized Air Conditioner B
U0201-87 Lost Communication with "Door Control Module C" Missing Message Diagnosis Condition:
  1. IG voltage is 8.5 V or more

Malfunction Status:

  1. No communication with position control ECU

Detection Time:

  1. Continuously for 10 seconds or more
  • CAN communication system
  • Position control ECU
  • Air conditioning amplifier assembly
 Memorized Air Conditioner B
U1114-87 Lost Communication with Driver Seat Switch Control Module Missing Message Diagnosis Condition:
  1. IG voltage is 8.5 V or more

Malfunction Status:

  1. No communication with integration control sub-assembly

Detection Time:

  1. Continuously for 10 seconds or more
  • CAN communication system
  • Integration control sub-assembly
  • Air conditioning amplifier assembly
 Memorized Air Conditioner B
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