BE–132 BODY ELECTRICAL SYSTEM – THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM 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 below). 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 stopping the horns from blowing: (1) The front LH or RH door is unlocked with a key. (2) The ignition switch is turned to ACC or ON position. (3) Approximately 1 minute elapses. WIRING DIAGRAM T9 Theft Deterrent and Door Lock ECU R/B NO.2 HORN Relay W 2 2 1 2 L-R 16 L-R 14 L-R HORN IB2 IF2 24 3 2 L-B L-R Horn Switch R/B No.2 HAZ-HORN L-B L-B 2A 1 B Battery Horn N08546