Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2010MUSTANG BASE, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSANTI-THEFT SYSTEM - PERIMETERDIAGNOSIS AND TESTINGANTI-THEFTDTC CHARTSSMART JUNCTION BOX (SJB) DTC CHART
2010 Ford Mustang Base, 2D Coupe, Automatic
Smart Junction Box (SJB) DTC Chart
2010 Ford Mustang Base, 2D Coupe, AutomaticSECTION Smart Junction Box (SJB) DTC Chart
SMART JUNCTION BOX (SJB) DTC CHART
| DTC | Description | Action |
|---|---|---|
| B1520 | Hood Switch Circuit Open | GO to PINPOINT TEST F . |
| B2100 | Door Driver Key Cylinder Switch Failure | GO to PINPOINT TEST A . |
| B2108 | Trunk Key Cylinder Switch Failure | DISREGARD the DTC. The vehicle is not equipped with a luggage compartment lock cylinder or a luggage compartment lock cylinder disarm switch. CLEAR the DTCs. REPEAT the self-test. If DTC B2108 is retrieved again, the Smart Junction Box (SJB) may be incorrectly configured. CARRY OUT the Programmable Module Installation (PMI) procedure. REFER to MODULE CONFIGURATION . |
| B2494 | Anti-Theft Horn Output Circuit Short to Battery |
NOTE:
The fault trigger conditions for this DTC is either a short to battery or an open on the anti-theft horn output circuit. If the anti-theft horn is inoperative, GO to PINPOINT TEST B .If the anti-theft horn is on continuously, GO to PINPOINT TEST C . |
| B2496 | Anti-Theft Horn Output Circuit Short to Gnd | GO to PINPOINT TEST B . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC ) Control Module | REFER to MULTIFUNCTION ELECTRONIC MODULES to diagnose the SJB . |
| All other DTCs | - | REFER to the DIAGNOSTIC TROUBLE CODE (DTC) CHART . |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.