DTC 3-1

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: 3-1: GPS Antenna Error

DTC 3-1 - GPS Antenna Error

DESCRIPTION

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the telephone antenna (GPS antenna) is malfunctioning; or 3) the antenna cord is malfunctioning.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT TELEPHONE ANTENNA ASSEMBLY (GPS ANTENNA) AND ANTENNA CORD SUB-ASSEMBLY





(a) Disconnect the antenna cord connector from the ECU.
(b) Measure the resistance of the connector.
Standard resistance:






OK -- CHECK OPERATION OF MAYDAY ECU
NG -- Continue to next step.
2. INSPECT ANTENNA CORD SUB-ASSEMBLY





(a) Disconnect the antenna cord connector from the ECU.
(b) Disconnect the antenna cord connector from the telephone antenna.
(c) Measure the resistance of the antenna cord.
Standard resistance:






NG -- REPLACE ANTENNA CORD SUB-ASSEMBLY THEN CLEAR HISTORIC DTC
OK -- Continue to next step.
3. CHECK OPERATION OF MAYDAY ECU
(a) Temporarily replace the mayday ECU and mayday battery with a new one.
(b) Check for the current DTC again.
OK:
System operates normally (red LED off).
NG:
Current DTC 3-1 exists
NG -- REPLACE TELEPHONE ANTENNA ASSEMBLY (GPS ANTENNA) THEN CLEAR HISTORIC DTC
OK -- END (MAYDA ECU IS FAULTY; PERFORM REGISTRATION)