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 telephone ECU assembly.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (TEL, IGN, ACC)
(a) Remove the TEL and IGN fuses from the engine room relay block.
(b) Remove the ACC fuse from the cowl side junction block LH.
(c) 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 P2 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 -- Continue to next step.
3. REPLACE TELEPHONE ECU ASSEMBLY TOGETHER WITH MAYDAY BATTERY
NEXT -- PERFORM REGISTRATION