Horn Circuit
THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Horn Circuit
- Horn Circuit
DESCRIPTION
When the theft deterrent system is in the alarm sounding state, the main body ECU outputs a signal repeatedly at 0.4 second intervals, causing the horn(s) to sound.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK HORN OPERATION
(a) Press the horn switch and check if the horn(s) sound.
OK:
Horn(s) operate normally.
NG -- GO TO HORN SYSTEM Symptom Related Diagnostic Procedures
OK -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (VEHICLE HORN)
(a) Operate the Techstream according to the steps on the display and select Active Test Theft Deterrent System.
Main Body
OK:
Horn(s) operate normally.
NG -- CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU)
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Theft Deterrent System
3. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU)
(a) Disconnect the 1C relay connector.
(b) Remove the main body ECU Removal.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal