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 MANUALSLINCOLN2006ZEPHYRREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSHANDLES, LOCKS, LATCHES AND ENTRY SYSTEMSDIAGNOSIS AND TESTINGLOCKS, LATCHES AND ENTRY SYSTEMSSYMPTOM CHART

2006 Lincoln Zephyr

Symptom Chart

2006 Lincoln ZephyrSECTION Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the smart junction box (SJB)	Fuse(s) Circuitry SJB	REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES .
No communication with the driver door module (DDM)	Fuse(s) Circuitry DDM	REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES .
The door locks do not operate correctly from one or more switches - without memory	Circuitry Door lock control switches Smart junction box (SJB)	GO to PINPOINT TEST A .
The door locks do not operate correctly from one or more switches - with memory	Circuitry Door lock control switches Driver door module (DDM) Smart junction box (SJB)	GO to PINPOINT TEST B .
The luggage compartment lid is inoperative - from the luggage compartment lid release switch	Circuitry Luggage compartment lid release switch Luggage compartment lid latch Smart junction box (SJB)	GO to PINPOINT TEST C .
All door locks are inoperative	Fuse(s) Circuitry Smart junction box (SJB)	GO to PINPOINT TEST D .
A single/more than one door lock is inoperative - without memory	Circuitry Door lock actuator Smart junction box (SJB)	GO to PINPOINT TEST E .
A single/more than one door lock is inoperative - with memory	Circuitry Door lock actuator Driver door module (DDM) Smart junction box (SJB)	GO to PINPOINT TEST F .
The doors do not lock/unlock using the remote keyless entry (RKE) keypad	Circuitry RKE keypad Driver door module (DDM) Smart junction box (SJB)	GO to PINPOINT TEST G .
The doors do not lock/unlock using the remote keyless entry (RKE) transmitter	RKE transmitter RKE transmitter battery RKE transmitter programming Aftermarket system High power devices TV/radio transmission towers Smart junction box (SJB)	GO to PINPOINT TEST H .
The autolock does not operate correctly	Ignition switch Door ajar switches Vehicle speed signal Transmission range (TR) sensor Smart junction box (SJB)	GO to PINPOINT TEST I .
The smart lock does not operate correctly	Door ajar switch(es) Key-in-ignition switch Smart junction box (SJB)	GO to PINPOINT TEST J .
The luggage compartment lid is inoperative using the remote keyless entry (RKE) transmitter	Circuitry RKE transmitter Smart junction box (SJB)	GO to PINPOINT TEST K .
The remote keyless entry (RKE) transmitter is out of synchronization	RKE transmitter button pressed substantial amount of times while outside the range of the vehicle RKE transmitter Smart junction box (SJB)	GO to PINPOINT TEST L .
Panic feature is inoperative/does not operate correctly	Horn Turn signal lamps RKE transmitter Smart junction box (SJB)	GO to PINPOINT TEST M .
The remote keyless entry (RKE) keypad illumination is inoperative	Circuitry RKE keypad Smart junction box (SJB)	GO to PINPOINT TEST N .
The remote keyless entry (RKE) transmitter has poor range performance	RKE transmitter Aftermarket system High power devices TV/radio transmission towers SJB antenna Smart junction box (SJB)	GO to PINPOINT TEST O .
The auto unlock does not operate correctly	Vehicle speed signal Door ajar switches Smart junction box (SJB)	GO to PINPOINT TEST P .
The memory seat does not operate correctly using the remote keyless entry transmitter	Remote memory activation Driver door module (DDM) Smart junction box (SJB)	ACTIVATE the remote memory activation. REFER to REMOTE MEMORY ACTIVATION . TEST the system for normal operation. If it is still inoperative, REFER to SEATING to diagnose the memory seat.

RENDER: 1.0x

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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.