Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

(a) The DCM (telematics transceiver) control the vehicle safety connect system functions. Safety connect system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3). In some cases, a malfunction may be occurring in the safety connect system. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.

CHECK DLC3

(a) Check the DLC3.

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INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery.

CHECK INDICATOR

(a) When a malfunction is detected in the safety connect system, the manual (SOS) switch red indicator on the manual (SOS) switch illuminates to inform the driver of the malfunction.

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    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of ...

    Terminals Of Ecu
    TERMINALS OF ECU Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition J157-1 (+B) - J157-20 (E) Y - W-B Power source (+B) Always 11 to 14 V ...

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    TERMINALS OF ECU DCM (TELEMATICS TRANSCEIVER) *a to Telephone Antenna (Sub) *b to GPS Antenna *c to Telephone Antenna (Main) - - Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition J168-1 (USB-) - USB communication line - ...

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