DTC B1573: Short in Telephone Antenna Circuit; DTC B15CB: Telematics Transceiver Antenna Disconnected [06/2018 - 10/2019]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

These DTCs are stored when the DCM (Telematics Transceiver) detects an open or a short in the telephone and GPS antenna assembly (for Roof Side) circuit. The DCM (Telematics Transceiver) oscillates and receives 824 - 894 MHz or 1850 - 1990 MHz radio-frequency signals through the telephone and GPS antenna assembly (for Roof Side).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1573	Short in Telephone Antenna Circuit	Telephone and GPS antenna assembly (for Roof Side) impedance is lower than malfunction criterion for 10 seconds when engine switch is on (IG). (Short circuit)	DCM (Telematics Transceiver) Telephone and GPS antenna assembly (for Roof Side) Telephone and GPS antenna cord (Antenna cord sub-assembly) Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly)
B15CB	Telematics Transceiver Antenna Disconnected	Telephone and GPS antenna assembly (for Roof Side) impedance is higher than malfunction criterion for 10 seconds when engine switch is on (IG). (Open circuit)	DCM (Telematics Transceiver) Telephone and GPS antenna assembly (for Roof Side) Telephone and GPS antenna cord (Antenna cord sub-assembly) Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly)