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 MANUALSMERCURY2005MARINER 2WD V6-3.0L VIN 1REPAIR AND DIAGNOSISBODY AND FRAMELOCKSPOWER LOCKSTESTING AND INSPECTIONPINPOINT TESTSTEST I: THE DOOR LOCKS OPERATE ONLY ONE WAY
2005 Mercury Mariner 2WD V6-3.0L VIN 1
Test I: The Door Locks Operate Only One Way
2005 Mercury Mariner 2WD V6-3.0L VIN 1SECTION Test I: The Door Locks Operate Only One Way
PINPOINT TEST I: THE DOOR LOCKS OPERATE ONLY ONE WAY
Normal Operation
The door lock control switches supply a ground signal to the smart junction box (SJB). When the SJB receives a door lock control switch lock command through circuit 1088 (PK/WH), it supplies voltage to the door lock actuators through circuit 117 (PK/BK), while grounding circuit 118 (PK/OG) and circuit 163 (RD/OG) to lock all the doors. When the SJB receives a door lock control switch unlock command through circuit 1088 (PK/WH), it supplies voltage to the door lock actuators through circuit 118 (PK/OG) and circuit 163 (RD/OG), while grounding circuit 117 (PK/BK) to unlock all the doors. The driver door lock control switch and passenger door lock control switch circuits are spliced together within the wiring harness.
Possible Causes
- circuit 117 short to ground or short to voltage
- circuit 118 short to ground or short to voltage
- circuit 163 short to ground or short to voltage
- SJB
I1-I2:
I2-I4:
I5-I6:
Normal Operation
The door lock control switches supply a ground signal to the smart junction box (SJB). When the SJB receives a door lock control switch lock command through circuit 1088 (PK/WH), it supplies voltage to the door lock actuators through circuit 117 (PK/BK), while grounding circuit 118 (PK/OG) and circuit 163 (RD/OG) to lock all the doors. When the SJB receives a door lock control switch unlock command through circuit 1088 (PK/WH), it supplies voltage to the door lock actuators through circuit 118 (PK/OG) and circuit 163 (RD/OG), while grounding circuit 117 (PK/BK) to unlock all the doors. The driver door lock control switch and passenger door lock control switch circuits are spliced together within the wiring harness.
Possible Causes
- circuit 117 short to ground or short to voltage
- circuit 118 short to ground or short to voltage
- circuit 163 short to ground or short to voltage
- SJB
RENDER: 1.0x
NO RELATED
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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.