U0198

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: U0198: Lost Communication with Telematic Control Module

DTC U0198 - Lost Communication with Telematic Control Module

DESCRIPTION

This DTC is output when communication stops between the mayday ECU and bus buffer ECU.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)




(a) Disconnect the R24 and L93 ECU connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (MAYDAY ECU - VEHICLE BATTERY AND BODY GROUND)




(a) Disconnect the R24 ECU connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard voltage:





Standard resistance





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION