Lexus NX manuals

Lexus NX: Lost Communication with ECM / PCM "A" (U0100,U0142,U023A)

Lexus NX Service Manual / Vehicle Interior / Meter / Gauge / Display / Headup Display System / Lost Communication with ECM / PCM "A" (U0100,U0142,U023A)

DESCRIPTION

  • U0100: The meter mirror sub-assembly receives signals from the ECM via CAN communication.
  • U0142: The meter mirror sub-assembly receives signals from the main body ECU (multiplex network body ECU) via CAN communication.
  • U023A: The meter mirror sub-assembly receives signals from the forward recognition camera via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

U0100

Lost Communication with ECM / PCM "A"
  • DTC Detection Condition: IG+ voltage 9.5 to 11.5 V or higher
  • Malfunction Status: Lost communication with ECM
  • Malfunction Duration: 3.6 seconds or more
  • ECM
  • CAN communication system
  • Meter mirror sub-assembly

DTC stored

U0142

Lost Communication With Body Control Module "B"
  • DTC Detection Condition: IG+ voltage 9.5 to 11.5 V or higher
  • Malfunction Status: Lost communication with main body ECU (multiplex network body ECU)
  • Malfunction Duration: 5 seconds or more
  • Main body ECU (multiplex network body ECU)
  • CAN communication system
  • Meter mirror sub-assembly

DTC stored

U023A

Lost Communication With Image Processing Module "A"
  • DTC Detection Condition: IG+ voltage 9.5 to 11.5 V or higher
  • Malfunction Status: Lost communication with forward recognition camera
  • Malfunction Duration: 5 seconds or more
  • Forward recognition camera
  • CAN communication system
  • Meter mirror sub-assembly

DTC stored

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Head Up Display > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check if CAN communication DTCs are output.

Click here

Body Electrical > Head Up Display > Trouble Codes

HINT:

  • If CAN communication system malfunction DTCs are output, they may also be output for other systems.
  • If the CAN communication system has been inspected and repaired in other systems, the DTC will not be output when rechecking for DTCs.
  • If the DTC is output frequently, duplicate the conditions that cause the problem symptoms and perform the check again, even though the DTC was not output when rechecking for DTCs.

    Click here

OK:

DTC U0100, U0142 and U023A are not output

OK

USE SIMULATION METHOD TO CHECK

NG

GO TO CAN COMMUNICATION SYSTEM

READ NEXT:

 Main Switch Circuit

DESCRIPTION The headup display switch assembly and meter mirror sub-assembly are connected via direct line. The meter mirror sub-assembly can be turned off and on by operating the headup display switc

 Light Control Rheostat

 Components

COMPONENTS ILLUSTRATION *1 INSTRUMENT SIDE PANEL LH *2 NO. 1 INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY *3 TRIP SWITCH (LIGHT CONTROL RHEOSTAT) - -

SEE MORE:

 Open in One Side of Bus 5 Branch Line

DESCRIPTION When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Communication Bus Check" screen changes in

 No Response from ID BOX (B2789)

DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more. DTC No. Detection Item DTC Detection Condition Trouble Area B2789 No Response from ID BOX No communicatio

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