DTC 4-6

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: 4-6: SERVICES, PHONE or PTT Button has Connection Error

DTC 4-6 - SERVICES, PHONE or PTT Button has Connection Error

DESCRIPTION

This DTC is stored when one of the following occurs: 1) the telephone ECU assembly is malfunctioning; 2) the mayday switch on the map light assembly is malfunctioning; or 3) the wire harness between the telephone ECU assembly and the map light is open.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (TELEPHONE ECU ASSEMBLY - MAP LIGHT ASSEMBLY)





(a) Disconnect the P3 ECU connector.
(b) Disconnect the R7 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. INSPECT MAP LIGHT ASSEMBLY (MAYDAY SWITCH)





(a) Remove the map light Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE MAP LIGHT ASSEMBLY (MAYDAY SWITCH) THEN CLEAR HISTORIC DTC
OK -- Continue to next step.
3. REPLACE TELEPHONE ECU ASSEMBLY TOGETHER WITH MAYDAY BATTERY
NEXT -- PERFORM REGISTRATION