Normal Operation
WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
When the alarm system is armed, the Smart Junction Box (SJB) monitors the hood ajar switch. If the hood is opened while the alarm is armed, the hood ajar switch removes ground from the signal circuit. This signals the SJB that an unauthorized intrusion to the engine compartment has occurred and the SJB activates the perimeter alarm.
- DTC B1520 (Hood Switch Circuit Open) - an on-demand DTC that sets when the SJB detects an open in the hood switch circuit during the self-test. This DTC sets if the hood is open during a self-test.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Hood switch
- SJB