[moloudbass]

hey guys i have a 1996 ford mustang with factory anti theft alarm.. recently the alarm decides to go off a few seconds after arming. I checked the hood sensors since those seem to go out often. and i believe its fine. Also checked the door sensors and those are fine. Anything else i should check?


is there any windows sensors on this car? or is there a motion sensor i can disconnect? let me know thanks.

[phantom]

Components


The system is composed of the following components:

• anti-theft alarm control (19A366)
• alarm indicator lamp (located in instrument cluster (10849)
• door lock cylinder switch (220A40) right hand, door lock cylinder switch (220A41) left hand
• luggage compartment door lock cylinder switch
• ignition lock anti-theft switch (19A438)
• relay mounting panel (14B144) assembly
• anti-theft control bracket and switch (19A434)

The following components already exist in the vehicle and are used in the anti-theft alarm system:

• door lock switch (14028)
• lamp switch (13713)
• horn relay and bracket (13853) and horns (13832)
• low beam headlamp bulbs (13007)
• rear lamps (13404) and parking lamps (13200)
• starter relay (14N089)
• electronic door lock control processor

The alarm system operating sequences are designed to be passive; therefore, the system can be armed or disarmed when following normal vehicle entrance and exit procedures. Following is a detailed description of the system operation:

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System Triggering


NOTE: Within three minutes after the system has been triggered, the horns (13832) and exterior lamps will shut off automatically. The system will then reset to an armed state and will trigger again if another intrusion occurs. However, the vehicle's starter circuit will remain disabled until the system is disarmed.


The alarm system will be activated if any of the following actions occur after the system has been armed:

• opening either front door (20124) without first unlocking with door key
• removing luggage compartment door lock cylinder
• tampering with ignition key lock cylinder (3.8L vehicles only)
• opening the hood

[phantom]

Section 13-11A: Anti-Theft Alarm System
1996 Mustang Workshop Manual
DIAGNOSIS AND TESTING
Procedure revision date: 05/18/2000

Electrical Schematic



Anti-Theft Alarm System






Connector End Views






Pin NumberCircuitCircuit Function1196 (DB/O)Battery213 (R/BK)Low Beam Headlamp Output3627 (BK/O)Set Alarm Input (From Electronic Door Lock Control Processor)4296 (W/P)HOT in RUN/ACC523 (T/LG)Luggage Compartment Door Lock Cylinder Tamper Switch625 (DG/P)Door Disarm Switches7118 (PK/O)Unlock All Doors (Unlock Passenger Door Only with Remote Keyless Entry)15343 (DB/LG)Alarm Warning Lamp16196 (DB/O)Battery1713 (R/BK)Low Beam Headlamp Output186 (Y/LG)Horn Relay Output19—Not Used20—Not Used






Pin NumberCircuitCircuit Function8163 (R/O)Unlock Driver Door (with Remote Keyless Entry Only)9117 (PK/BK)Lock All Doors10936 (DG/W)Ignition Tamper Sensor11—Not Used1233 (W/PK)Starter Interrupt Input13—Not Used1424 (DB/O)Lamp Switches2114 (BR)Parking Lamps2214 (BR)Parking Lamps23938 (BK/LG)Ignition Sensor Ground Input2432 (R/LB)Starter Interrupt Output25—Not Used26397 (BK/W)Ground






Pin NumberCircuitCircuit Function125 (DG/P)Anti-Theft Switch Disarm224 (DB/O)Anti-Theft Switch Arm3934 (R/Y)Receive Signal4933 (BK/O)Transmit Signal5936 (DG/W)Key Cylinder Sensor to Module657 (BK)Ground






Pin NumberCircuitCircuit Function13 (LG/W)Left Turn Indicator2932 (GY/W)Hi Beam Indicator3343 (DB/LG)Anti-Theft Indicator454 (LG/Y)Battery Power5679 (GY/BK)Vehicle Speed Sensor (VSS)6676 (PK/O)Speedometer Ground7640 (R/Y)12V Input8911 (W/LG)Transmission Control Indicator Lamp9658 (PK/LG)Malfunction Indicator Lamp (MIL) Feed10904 (LG/R)Charge Indicator1116 (R/LG)Ignition Switch Feed1257 (BK)Ground1329 (Y/W)Fuel Gauge Feed1439 (R/W)Engine Coolant Temperature Gauge Feed15563 (O/Y)Ground16640 (R/Y)12V Input

[phantom]

Section 13-11A: Anti-Theft Alarm System
1996 Mustang Workshop Manual
DIAGNOSIS AND TESTING
Procedure revision date: 05/18/2000

Inspection and Verification

1. Verify the customer's concern by operating the anti-theft alarm system to duplicate the condition.

1. Inspect to determine if one of the following mechanical or electrical concerns apply:
   
   
   VISUAL INSPECTION CHART MechanicalElectrical
   • Damaged luggage compartment door lock cylinder.
   • Open fuses:
     • Power Distribution Box (Engine Compartment) - Horn/HAZ (20A), F-Pan (40A Maxi) Fuse Junction - 5 (10A), INT LPS (15A), ACC (10A)
     • In-Line Fuse - 20A
   • Loose connections.
   • Corroded connections.

1. If the inspection reveals obvious concern(s) that can be readily identified, service as required.

1. If the concern(s) remains after the inspection, determine the symptom(s) and go to the Symptom Chart.

1. 
   NOTE: This quick test quickly provides the capability to identify a shorted to ground condition for the door lock cylinder switches, hood switch, ignition lock anti-theft switch or the associated circuits.
   
   Perform the following anti-theft, on-board diagnostic test as follows:
   • Turn ignition switch to ACCESSORY. If the THEFT indicator lamp comes on solid for 10 seconds, service the ignition lock anti-theft switch and/or Circuit 936 (DG/W).
   • Activate power door UNLOCK button five times within 10 seconds.
   • Count the number of flashes of the anti-theft warning indicator lamp (repeats every 10 seconds). Refer to table for results and action to take.
   • 
     NOTE: Diagnostic mode will automatically cancel after two minutes or by turning key to OFF.
     
   
   Number of FlashesAction To Take1Door lock cylinder switches and hood switch inputs normal.2Door lock cylinder switch input shorted. Service door lock cylinder switches and/or Circuit 25 (DG/P).3Hood switch/luggage compartment tamper switch input shorted. Service hood switch and/or luggage lock cylinder switch and/or Circuit 23 (T/LG).4Both inputs shorted. Service door lock cylinder switches and/or Circuit 25 (DG/P). Service hood switch and/or luggage compartment lock cylinder switch and/or Circuit 23 (T/LG).