Possible Causes
Visual Inspection and Diagnostic Pre-checks
Inspect the hood latch for damage.
PINPOINT TEST A : THE ALARM SYSTEM DOES NOT ACTIVATE FROM AN UNAUTHORIZED ENTRY
AT THE HOOD
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
A1 MONITOR THE BCM (BODY CONTROL MODULE) HOOD AJAR SWITCH (HOOD_SW) PID (PARAMETER IDENTIFICATION)
Ignition ON. Using a diagnostic scan tool, view the BCM Parameter Identifications (PIDs). Using a diagnostic scan tool, monitor the BCM HOOD_SW PID. Disconnect Hood Ajar Switch C127.
Does the PID read AJAR when the switch is disconnected?
Yes | INSTALL a new hood latch. REFER to: Hood Latch (501-14 Handles, Locks, Latches and Entry Systems, Removal and Installation). |
|---|---|
No | GO to A2 |
A2 CHECK THE HOOD AJAR SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
Ignition OFF. Disconnect BCM C2280F. Measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C127-2 | Ground |
Is the resistance greater than 10,000 ohms?
Yes | GO to A3 |
|---|---|
No | REPAIR the circuit. |
A3 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
Disconnect and inspect all BCM connectors. Repair:
corrosion (install new connector or terminals – clean module pins) damaged or bent pins – install new terminals/pins pushed-out pins – install new pins as necessary
Reconnect all BCM connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present.
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.