Service Notes

PRE-CHECK

NOTE: If the ignition switch is turned ON with the airbag ECU connectors disconnected, or if a vehicle battery is removed with the ignition switch ON or if the +B circuit is OPEN within 10 sec. after the ignition switch is turned OFF, the system will determine this condition as a failure and it will automatically call the call center.

To prevent this, perform the following when working on operation related to the airbag ECU or a battery:
- Disconnect the connectors of the telephone ECU (Mayday ECU)and the back-up battery before disconnecting the airbag ECU connector. (Disconnect the connectors of the vehicle harness and the LEXUS LINK System assembly.)
- Be sure that the ignition switch is OFF when removing a vehicle battery.

HINT:
- When an accidental call is made automatically, access to the call center and ask them to cut off the line.
- If no signal has been received from the airbag ECU since the ignition switch was turned ON, a service call will be made.
- If signal reception from the airbag ECU is interrupted while the ignition switch is ON, an emergency call will be made.