DTC 4

DTC 4 "CODE 4 Telephone ECU Failure"

CIRCUIT DESCRIPTION

This DTC is output when there is a failure in the telephone ECU (Mayday ECU). In this case replace the telephone ECU (Mayday ECU).

INSPECTION PROCEDURE

Replace the telephone ECU (Mayday ECU).

HINT: If DTC is not cleared even though the Mayday ECU is replaced, replace the Mayday Assembly (Transceiver, Back-up battery, Bus buffer ECU and Mayday ECU).