DTC P1779-49: Gear Shift Control Module Backup Power Supply Internal Electronic Failure [09/2023 - ]: Procedure

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

CHECK DTC OUTPUT (SUB BATTERY SYSTEM)

Pre-procedure1

Turn the ignition switch to ON.
Procedure1

Check for DTCs.

Body Electrical > Sub Battery System > Trouble Codes

Result

Proceed to
NEXT

Post-procedure1

Turn the ignition switch off.

Result:

NEXT

GO TO SUB BATTERY SYSTEM. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2023 - 12/2023] , or refer to DIAGNOSTIC TROUBLE CODE CHART [12/2023 - ]