CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the vehicle ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Safety Connect System(for Hv Model): Backup Battery Degradation (B15EC)
DESCRIPTION This DTC is set when the DCM (Telematics Transceiver) detects either of the following conditions. The BUB (Back-Up Battery) charge level becomes less than the criteria. The BUB (Back-up Battery) was used for Automatic Collision Notification (ACN). When this DTC is set, the BUB (Back-Up B ...