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Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODES (DTC) LIST

DTC Description
DTC B2780  PUSH SWITCH/KEY UNLOCK WARNING SWITCH MALFUNCTION
DTC B2784  ANTENNA COIL OPEN/SHORT
DTC B2793  TRANSPONDER CHIP MALFUNCTION
DTC B2794  UNMATCHED ENCRYPTION CODE
DTC B2795  UNMATCHED KEY CODE
DTC B2796, B2798  NO COMMUNICATION IN IMMOBILIZER SYSTEM & COMMUNICATION MALFUNCTION NO. 2
DTC B2797  COMMUNICATION MALFUNCTION NO.1
DTC B2799  ENGINE IMMOBILIZER SYSTEM MALFUNCTION
  1. TRANSPONDER KEY ECU DIAGNOSTIC TROUBLE CODE CHART 
    Fig 1: Transponder Key ECU Diagnostic Trouble Code Chart
    G02578012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. ECM DIAGNOSTIC TROUBLE CODE CHART 
    NOTE: The DTC for the immobiliser system is specified. If the other codes are output, check the DTC chart of the engine control system.
    Fig 2: ECM Diagnostic Trouble Code Chart
    G02578013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002