Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Lost Communication with ECM / PCM "A" (U0100,U0129,U0131,U0140,U0151,U0163,U0182,U023A)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Lost Communication with ECM / PCM "A" (U0100,U0129,U0131,U0140,U0151,U0163,U0182,U023A)

DESCRIPTION

The combination meter assembly communicates with the ECM, brake actuator assembly (skid control ECU), power steering ECU assembly, main body ECU (multiplex network body ECU), airbag sensor assembly, radio receiver assembly, headlight ECU sub-assembly LH* and forward recognition camera via CAN communication.

  • *: w/ Automatic Headlight Beam Level Control System

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

U0100

Lost Communication with ECM / PCM "A"

Diagnosis Condition:

  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • No communication with ECM

Malfunction Time:

  • 2 seconds or more
  • ECM
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0129

Lost Communication with Brake System Control Module

Diagnosis Condition:

  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • No communication with brake actuator assembly (skid control ECU)

Malfunction Time:

  • 3 seconds or more
  • Brake actuator assembly (skid control ECU)
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0131

Lost Communication with Power Steering Control Module

Diagnosis Condition:

  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • No communication with power steering ECU with motor assembly

Malfunction Time:

  • 3 seconds or more
  • Power steering ECU assembly
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0140

Lost Communication with Body Control Module

Diagnosis Condition:

  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • No communication with main body ECU (multiplex network body ECU)

Malfunction Time:

  • 3 seconds or more
  • Main body ECU (Multiplex network body ECU)
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0151

Lost Communication with Restraints Control Module

Diagnosis Condition:

  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • No communication with airbag sensor assembly

Malfunction Time:

  • 10 seconds or more
  • Airbag sensor assembly
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0163

Lost Communication with Navigation Control Module

Diagnosis Condition:

  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • No communication with radio receiver assembly

Malfunction Time:

  • 3 seconds or more
  • Radio receiver assembly
  • CAN communication system
  • Combination meter assembly

DTC stored

-

U0182

Lost Communication with Lighting Control Module Front

Diagnosis Condition:

  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • No communication with No. 1 headlight ECU sub-assembly LH

Malfunction Time:

  • 10 seconds or more
  • Headlight ECU sub-assembly LH
  • CAN communication system
  • Combination meter assembly

DTC stored

w/ Automatic Headlight Beam Level Control System

U023A

Lost Communication with Front Camera Module

Diagnosis Condition:

  • The engine switch is on (IG)
  • IG power source voltage is 9.5 V or more

Malfunction Status:

  • No communication with forward recognition camera

Malfunction Time:

  • 10 seconds or more
  • Forward recognition camera
  • CAN communication system
  • Combination meter assembly

DTC stored

-

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication DTCs are output.

Click here

Result

Proceed to

CAN communication DTCs are output

A

CAN communication DTCs are not output

B

A

GO TO CAN COMMUNICATION SYSTEM

B

USE SIMULATION METHOD TO CHECK

    Entire Combination Meter does not Operate
    DESCRIPTION This circuit is the power source circuit for the combination meter assembly. This circuit provides two types of power sources; one is a constant power source, and the other is an IG power ...

    Speedometer Malfunction
    DESCRIPTION The combination meter assembly receives vehicle speed signals from the brake actuator assembly (skid control ECU) via CAN communication. The speed sensor detects the wheel speed and sends ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

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