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 MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1272 (ANTI-THEFT SYSTEM - PERIMETER)DIAGNOSIS AND TESTINGANTI-THEFTSYMPTOM TABLE

2010 Mercury Mariner Hybrid, AWD

Symptom Table

2010 Mercury Mariner Hybrid, AWDSECTION Symptom Table

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM TABLE

Condition	Possible Sources	Action
No communication with the Smart Junction Box (SJB)	Fuse(s) Wiring, terminals or connectors SJB	REFER to PINPOINT TEST U: THE SMART JUNCTION BOX (SJB) DOES NOT RESPOND TO THE SCAN TOOL .
The alarm system does not arm/disarm - using the Integrated Keyhead Transmitter (IKT) key	IKT key concern Anti-theft system concern SJB	Arm the alarm system using one of the IKT keys, then disarm the alarm system using the same IKT key. Repeat this process with the second IKT key. If the alarm system arms and disarms correctly with both IKT keys, the vehicle is operating to design intent. INSTRUCT the customer on the correct operation of the vehicle and the perimeter alarm system. If the alarm system does not arm and/or disarm correctly with both IKT keys, INSTALL a new SJB. REFER to INSTALLATION . CLEAR the DTCs. REPEAT the self-test. TEST the system for correct operation. NOTE: It may be necessary to verify the perimeter alarm system is armed by opening a door using an interior door handle after the pre-arm phase has completed. If checking the vehicle for being correctly disarmed, it is only necessary to press the unlock button on the IKT key, then open the door using an interior door handle.
The alarm system does not arm/disarm - using the keyless entry keypad	Keyless entry keypad SJB	REFER to PINPOINT TEST A: ALL DOOR LOCKS ARE INOPERATIVE .
The alarm system does not operate correctly - from the driver door	Door ajar switch(es) SJB	Go to PINPOINT TEST A .
The alarm system does not operate correctly - alarm does not activate with hood ajar/open	Wiring, terminals or connectors Hood switch SJB	Go to PINPOINT TEST B .
The alarm system does not operate correctly - flashers or horn do not cycle during anti-theft activation	Horn system concern Turn signals system concern SJB	Go to PINPOINT TEST C .
The alarm system does not operate correctly - the alarm does not inhibit from the luggage compartment lid disarm switch	Wiring, terminals or connectors Luggage compartment lid disarm switch SJB	Go To PINPOINT TEST D .

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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.