DTC 4-1

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: 4-1: Red LED Error

DTC 4-1 - Red LED Error

DESCRIPTION

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the red LED is malfunctioning; or 3) the wire harness between the mayday ECU and the map light (mayday switch) is open or short.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MAYDAY ECU - MAP LIGHT (MAYDAY SWITCH))




(a) Disconnect the R23 ECU connector.
(b) Disconnect the X6 map light connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR THEN CLEAR HISTORIC DTC
OK -- Continue to next step.

2. CHECK MAP LIGHT ASSEMBLY (RED LED OPERATION)
(a) Temporarily replace the map light with a new or normally functioning one for standard body Removal or long body Removal.
(b) Check that the system operates normally.
OK:
Red LED operates normally.
NG -- REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION
OK -- END (MAP LIGHT (RED LED) IS FAULTY; CLEAR HISTORIC DTC)