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Home >> Lexus >> 2009 >> IS F >> Repair and Diagnosis (Single Page) >> Steering >> Steering Column >> Power Tilt And Power Telescopic Steering Column System (Diagnostic Codes & Circuit Tests) >> Power Tilt And Power Telescopic Steering Column System >> DTC B2621: Communication Interruption >> Description

DTC B2621: Communication Interruption: Description

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a specified signal (periodic signal) onto the communication bus on a regular schedule. The multiplex tilt and telescopic ECU detects the connection of each ECU based on the signal.

DTC No. Detection Item Trouble Area
B2621 Periodic signal from the specified ECU has stopped.
  • Multiplex communication system
  • Main body ECU RH (Cowl side junction block RH)
  • Front power seat switch LH (Position control ECU)
  • Windshield wiper switch assembly (Combination switch ECU)
  • Power source control ECU
  • Multiplex tilt and telescopic ECU
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