Introduction
This service bulletin addresses various issues with the Data Communication Module (DCM) in certain Lexus models, including the ES250, ES350, UX200, and UX250h.
Some of the symptoms include:
- Diagnostic Trouble Code (DTC) B15A804
- Red SOS LED staying on after bulb check
- Lexus app inoperative or showing errors
- Remote start and remote services issues
- Depleted 12V vehicle battery
Warranty Information
This repair is covered under the Lexus Basic Warranty, which is in effect for 48 months or 50,000 miles, whichever occurs first.
Required Tools & Equipment
The following tools and equipment are required:
- Techstream ADVI or Techstream Lite
- Battery Diagnostic Tool (DCA-8000P)
DCM Reset and Firmware Update Procedure
The procedure involves moving the vehicle to an area with good DCM signal reception, performing a Health Check using Techstream, and clearing all DTCs.
Manual:
Download: 2021-2022 Lexus ES250, ES350, UX200, UX250h DCM Reset and Firmware Update (LG) Service Bulletin
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