Supra Liftback L6-2997cc 3.0L DOHC MFI Twin-Turbo (1997)
Alarm Horn Relay: Testing and Inspection
HORN RELAY CIRCUIT
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch ON and OFF in approximately 0.2 sec. cycles. This switches the horn
relay ON and OFF, thus the horns blow (See the wiring diagram).
In this condition, if any of the following operations is done, the Tr in the ECU goes OFF and the horn relay switches OFF, thus the horns stop blowing.
1. The front LH or RH door is unlocked with a key.
2. The ignition switch is turned to the ACC or ON position.
3. Approximately 1 minute elapses.
Horn Relay Circuit
WIRING DIAGRAM
