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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 96 (Smart Access System (For Start) - Diagnostic Codes (1 Of 2)) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, except Gasoline Model) >> DTC B2799-86: Engine Immobilizer System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [09/2023 - ] >> Description

DTC B2799-86: Engine Immobilizer System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [09/2023 - ]: Description

WARNING: This page is about a different car, the 2024 Lexus TX 550h+ and 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.

If there is a communication malfunction between the hybrid vehicle control ECU assembly and ID code box (immobilizer code ECU), or when the communication ID codes do not match, the hybrid vehicle control ECU assembly stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority Note
B2799-86 Engine Immobilizer System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid Either of the following conditions is met (1 trip detection logic*):
  • A malfunction is detected in the communication or communication lines between the hybrid vehicle control ECU assembly and ID code box (immobilizer code ECU).
  • The communication ID codes of the hybrid vehicle control ECU assembly and ID code box (immobilizer code ECU) do not match.
  • ID code box (immobilizer code ECU)
  • Hybrid vehicle control ECU assembly
  • Wire harness or connector
 Hybrid Control A DTC output confirmation operation (Perform either of the following):
  • Start the hybrid control system and wait for 10 seconds. If there is a malfunction, the hybrid control system will stop (communication begins within 3 seconds of the hybrid control system start operation being performed, and DTCs are stored after 6 seconds).
  • Connect the cable to the negative (-) auxiliary battery terminal, start the hybrid control system and wait for 10 seconds (communication begins within 3 seconds of the ignition switch being turned to ON, and DTCs are stored after 6 seconds).
  1. *: Only output while a malfunction is present.
VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED

Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Hybrid control system cannot be started -
RELATED DATA LIST AND ACTIVE TEST

DTC No. Data List and Active Test
B2799-86 -
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