10. Theft-Alarm Horn Activation Circuit

DESCRIPTION OF OPERATION
The ECU transistor is turned ON if the vehicle door. etc. are opened without use of the key. This energizes the theft-alarm horn relay to activate the horn.





CHECKING THE HORN ACTIVATION CIRCUIT
Disconnect the connector of the ECU, then short-circuit terminal No. 10 (LB line), and activate the theft-alarm horn relay.