Theft Warning Alarm

WARNING: This page is about a different car, the 2019 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

The theft warning alarm function activates horns and headlamps intermittently when BCM detects that any door, hood or trunk lid is opened by unauthorized means, while the system is in the ARMED state.
Security indicator lamp on combination meter always blinks when ignition switch is any position other than ON. Security indicator lamp blinking warns that the vehicle is equipped with a vehicle security system.

Operation Flow

Courtesy of NISSAN NORTH AMERICA, INC.

No.	System state	Switching condition
	DISARMED to PRE-ARMED	When all conditions of A and one condition of B is satisfied.	A	B
			Ignition switch: OFF All doors: Closed Hood: Closed Trunk lid: Closed	All doors are locked by: Door key cylinder LOCK switch LOCK button of Intelligent Key Door request switch
	PRE-ARMED to ARMED	When none of the following conditions are satisfied for 30 seconds.	Ignition switch: ACC/ON Door key cylinder UNLOCK switch: ON UNLOCK button of Intelligent Key: ON Door request switch: ON UNLOCK switch of door lock and unlock switch: ON Any door: Open Hood: Open Trunk lid: Open
	ARMED to ALARM	When one condition of A and one condition of B are satisfied.	Any door: Open Hood: Open Trunk lid: Open
	DISARMED to PRE-RESET	When all conditions of A and one condition of B is satisfied.	A	B
			Ignition switch: OFF All doors: Closed Hood and/or Trunk lid: Open	All doors are locked by: Door key cylinder LOCK switch LOCK button of Intelligent Key Door request switch
	PRE-ARMED to PRE-RESET	When one of the following conditions is satisfied.	Hood: Open Trunk lid: Open
	ARMED to PRE-RESET	When one of the following conditions is satisfied.	Trunk lid opener request switch: ON TRUNK OPEN button of Intelligent Key: ON
	ALARM to PRE-RESET
	PRE-RESET to DISARMED	When one of the following conditions is satisfied.	Ignition switch: ACC/ON Door key cylinder UNLOCK switch: ON UNLOCK button of Intelligent Key: ON Door request switch: ON UNLOCK switch of door lock and unlock switch: ON Hold the outside handle grip (one touch unlock sensor: ON) Any door: Open
	PRE-RESET to PRE-ARMED	When all conditions of A are satisfied, and all conditions of B are satisfied.	A	B
			Ignition switch: OFF All doors: Closed	Hood: Closed Trunk lid: Closed
	PRE-ARMED to DISARMED	When one of the following condition is satisfied.	Ignition switch: ACC/ON Door key cylinder UNLOCK switch: ON UNLOCK button of Intelligent Key: ON Door request switch: ON UNLOCK switch of door lock and unlock switch: ON Hold the outside handle grip (one touch unlock sensor: ON) Any door: Open
	ARMED to DISARMED	When one of the following condition is satisfied.	Ignition switch: ACC/ON Door key cylinder UNLOCK switch: ON UNLOCK button of Intelligent Key: ON Hold the outside handle grip (one touch unlock sensor: ON) Door request switch: ON
	ALARM to DISARMED
	RE-ALARM	When one of the following condition is satisfied after the ALARM operation is finished.	Any door: Open Hood: Open Trunk lid: Open

NOTE:

BCM ignores the door key cylinder UNLOCK switch signal input for 1 second after the door key cylinder LOCK switch signal input.
To lock/unlock all doors or trunk lid by operating remote controller button of Intelligent Key or door/trunk lid opener request switch, Intelligent Key must be within the detection area of outside key antenna. For details, refer to System Description .

DISARMED Phase

The vehicle security system is not set in the DISARMED phase. The vehicle security system stays in this phase while any door is open, because it is assumed that the owner is inside or nearby the vehicle. Security indicator lamp blinks every 2.4 seconds.

When the vehicle security system is reset, each phase switches to the DISARMED phase directly.

PRE-ARMED Phase

The PRE-ARMED phase is the transient state between the DISARMED phase and the ARMED phase. This phase is maintained for 30 seconds, so that the owner can reset the setting due to a mis-operation. This phase switches to the ARMED phase when vehicle conditions are not changed for 30 seconds. Security indicator lamp illuminates while being in this phase.

To reset the PRE-ARMED phase, refer to the switching condition of No. 10 in the table above.

ARMED Phase

The vehicle security system is set, and BCM monitors all necessary inputs. If any door, hood, or trunk lid is opened without using Intelligent Key or mechanical key, vehicle security system switches to the ALARM phase. Security indicator lamp blinks every 2.4 seconds.

To reset the ARMED phase, refer to the switching condition of No. 11 in the table above.

ALARM Phase

BCM transmits "Theft Warning Horn Request" signal and "High Beam Request" signal intermittently to IPDM E/R via CAN communication. In this phase, horns and headlamps are activated intermittently for approximately 50 seconds to warn that the vehicle is accessed by unauthorized means. ON/OFF timings of horns and headlamps are synchronized. After 50 seconds, the vehicle security system returns to the ARMED phase. At this time, if BCM still detects unauthorized access to the vehicle, the system is switched to the ALARM phase again. This RE-ALARM operation is carried out a maximum of 2 times.

To cancel the ALARM operation, refer to the switching condition of No. 12 in the table above.

NOTE: If a battery terminal is disconnected during the ALARM/ARMED phase, theft warning alarm stops. But when the battery terminal is reconnected, theft warning alarm is activated again.

PRE-RESET Phase

The PRE-RESET phase is the transient state between each phase and DISARMED phase. If only the condition of hood or trunk lid is not satisfied, the system switches to the PRE-RESET phase. Then, when any condition is changed, the system switches to the DISARMED phase or PRE-ARMED phase.