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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System (Aga0F) - Diagnostic Codes (2 Of 5) >> Electronic Shift Lever System >> DTC P1779-96: Gear Shift Control Module Backup Power Supply Component Internal Failure [10/2023 - ] >> Description

DTC P1779-96: Gear Shift Control Module Backup Power Supply Component Internal Failure [10/2023 - ]: Description

The integration control supply backs up the electronic shift lever system is used to prevent vehicle roll-away when supply power from the auxiliary battery is lost.

The integration control supply starts based on the IG (ON) signal.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P1779-96 Gear Shift Control Module Backup Power Supply Component Internal Failure An external malfunction is detected by the integration control supply
(1 trip detection logic)
  • Integration control supply
  • Brake control power supply assembly
  • Transmission floor shift assembly (shift control ECU)
  • Wire harness or connector
Does not come on
  • Master Warning Light
    • Does not come on
  • Multi-information Display Error Message
    • Displayed