LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2025 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (Smart Access System (For Start) - Diagnostic Codes & Symptom Tests (1 Of 2)) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, HEV Model) >> DTC B2790-46: ID-BOX Calibration / Parameter Memory Failure [11/2021 - ] >> Description

DTC B2790-46: ID-BOX Calibration / Parameter Memory Failure [11/2021 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.

When an internal malfunction occurs in the ID code box (immobiliser code ECU), the certification ECU (smart key ECU assembly) stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2790-46 ID-BOX Calibration / Parameter Memory Failure An internal malfunction occurs in the ID code box (immobiliser code ECU) (EEPROM access malfunction) (1 trip detection logic*).
  • ID code box (immobiliser code ECU)
  • Certification ECU (smart key ECU assembly)
 DTC output confirmation operation: 
  1. An immobiliser set/unset operation is performed (the ignition switch is turned off or to ON while the electrical key transmitter sub-assembly is being carried).
  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
  • Ignition switch ON (READY): Hybrid control system cannot be started next time
  • Hybrid control system stopped: Hybrid control system cannot be started
 -
RELATED DATA LIST AND ACTIVE TEST

DTC No. Data List and Active Test
B2790-46 -
scientia non olet · About LEMON Manuals