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 through the Mayday ECU is replaced, replace the Mayday Assembly (Transceiver, Back-up battery, Bus buffer ECU and Mayday ECU).