DTC 6-4

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: 6-4: Backup Battery Connection Error

DTC 6-4 - Backup Battery Connection Error

DESCRIPTION

After the ignition switch is turned ON and 10 seconds or more have passed, if the mayday ECU assembly does not recognize the mayday battery (backup battery), this DTC is output.
HINT: This DTC is only a historic DTC.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (MAYDAY ECU ASSEMBLY - MAYDAY BATTERY)




(a) Disconnect the M16 ECU connector.
(b) Disconnect the M19 battery connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. REPLACE MAYDAY BATTERY (BACKUP BATTERY)
(a) Perform registration Programming and Relearning.
(b) Check for DTC again.
OK:
No DTCs output.
OK -- END
NG -- Continue to next step.
3. REPLACE MAYDAY ECU ASSEMBLY
(a) Replace the mayday ECU assembly Removal.
NEXT -- Continue to next step.
4. PERFORM REGISTRATION
(a) Perform registration Programming and Relearning.
NEXT -- END