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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (Electronic A/T Shift Lever System - Diagnostic Codes & Circuit Tests) >> Electronic Shift Lever System >> DTC P1779-49: Gear Shift Control Module Backup Power Supply Internal Electronic Failure [10/2022 - ] >> Description

DTC P1779-49: Gear Shift Control Module Backup Power Supply Internal Electronic Failure [10/2022 - ]: Description

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The integrated capacitor backs up the electronic shift lever system, remote parking system and electric door lock system and is used to prevent vehicle roll-away, occupant lock-in during a collision, and ensures braking force when supply power from the auxiliary battery is lost.

The integrated capacitor starts based on the IG (ON) signal.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate DTC Output from Priority Note
P1779-49 Gear Shift Control Module Backup Power Supply Internal Electronic Failure An internal malfunction is detected by the integrated capacitor
(1 trip detection logic)
  • Integration control supply (integrated capacitor)
  • Power distribution box assembly
  • Brake control power supply assembly
  • Wire harness or connector
Does not come on Multi-information Display Error Message 
  • Displayed
Hybrid Control A SAE: P1779