NIGHT VIEW SYSTEM, Diagnostic DTC:B2821

DTC Code DTC Name
B2821 Body Multiplex Signal Abnormal Condition

DESCRIPTION

The No. 1 night view ECU receives headlight dimmer switch signals from the main body ECU via CAN communication.

This DTC is stored when an abnormal combination of headlight dimmer switch signals are detected.

Tech Tips

While DTCs are stored, the night view system does not operate and a warning message is displayed on the accessory meter assembly.

DTC Code DTC Detection Condition Trouble Area
B2821 The No. 1 night view ECU detects an abnormal combination of headlight dimmer switch signals.

  • CAN communication system

  • Lighting system

  • No. 1 night view ECU

WIRING DIAGRAM

A01H1TQE05

INSPECTION PROCEDURE

Note

When the No. 1 night view ECU is replaced, perform object recognition camera (night view camera) adjustment Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally.


      OK
      CAN communication system DTCs are not output.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. READ VALUE USING GTS


    1. Using the GTS, read the Data List Click here.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG SW Power switch on (IG) signal / ON or OFF

      ON: Power switch on (IG)

      OFF: Power switch off

      		 "OFF" is also displayed for this item when the power switch is on (ACC).
      Dimmer SW Headlight dimmer switch high position signal / ON or OFF

      ON: Headlight dimmer switch in high or high flash position

      OFF: Headlight dimmer switch in low position

      		 -
      Passing Light SW Headlight dimmer switch high flash position (pass) signal / ON or OFF

      ON: Headlight dimmer switch in high flash position

      OFF: Headlight dimmer switch not in high flash position

      		 -
      Auto Light SW Headlight dimmer switch AUTO position signal / ON or OFF

      ON: Headlight dimmer switch in AUTO position

      OFF: Headlight dimmer switch not in AUTO position

      		 -
      Head Light SW (Head) Headlight dimmer switch head position signal / ON or OFF

      ON: Headlight dimmer switch in head position

      OFF: Headlight dimmer switch not in head position

      		 -
      Head Light SW (Tail) Headlight dimmer switch tail position signal / ON or OFF

      ON: Headlight dimmer switch in tail or head position

      OFF: Headlight dimmer switch in neither tail nor head position

      		 -
      OK
      The display is as specified in the normal condition column.

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

    REPLACE NO. 1 NIGHT VIEW ECU Click here