Component Tests and General Diagnostics

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: ECU Power Source Circuit

ECU Power Source Circuit

DESCRIPTION

This circuit supplies power to operate the mayday ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (RADIO NO. 1, P RR-IG2, P-ACC)
(a) Remove the RADIO NO. 1, P RR-IG2 and P-ACC fuses from the passenger side junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE FUSE
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (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