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 MANUALSFORD2010EXPLORER SPORT TRAC 4WD V8-4.6LREPAIR AND DIAGNOSISLIGHTING AND HORNSBACKUP LAMPTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWPRINCIPLES OF OPERATION
2010 Ford Explorer Sport Trac 4WD V8-4.6L
Principles Of Operation
2010 Ford Explorer Sport Trac 4WD V8-4.6LSECTION Principles Of Operation
Reversing Lamps
Principles of Operation
NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
The SJB receives transmission gear status from the PCM through the Instrument Cluster (IC) gateway, over the communication network. When a message is sent over the communication network stating the transmission is in REVERSE (R), the SJB energizes an internal relay which supplies voltage to the reversing lamps.
The PCM sets DTCs if there are any concerns with the input from the Transmission Range (TR) sensor.
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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.