Symptom Chart

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the vehicle security module	Circuit or connection in the UART-based protocol (UBP) network Vehicle security module	REFER to MULTIFUNCTION ELECTRONIC MODULES .
A single/more than one door lock is inoperative	Door lock control switchs Door lock actuators Circuitry Liftgate remote control Vehicle security module	GO to PINPOINT TEST A .
The doors do not lock/unlock using the remote keyless entry keypad	Remote keyless entry (RKE) keypad Circuitry Vehicle security module	GO to PINPOINT TEST B .
The doors do not lock/unlock using the remote keyless entry transmitter	Remote keyless entry (RKE) transmitter battery RKE transmitter RKE transmitter programming Aftermarket system High power devices TV/radio transmission towers Vehicle security module	GO to PINPOINT TEST C .
The autolock does not operate correctly	Door ajar switches Circuitry UART-based protocol (UBP) network Vehicle security module	GO to PINPOINT TEST D .
Panic feature is inoperative/does not operate correctly	Remote keyless entry (RKE) transmitter Circuitry Vehicle security module	GO to PINPOINT TEST E .
The remote keyless entry keypad illumination is inoperative	Remote keyless entry (RKE) keypad Circuitry Vehicle security module	GO to PINPOINT TEST F .
The remote keyless entry transmitter is out of synchronization	Remote keyless entry (RKE) transmitter RKE transmitter button pressed a substantial amount of time while outside the range of the vehicle Vehicle security module	GO to PINPOINT TEST G .
The smart lock does not operate correctly	Circuitry. Door lock control switches LH front door ajar switch UART-based protocol (UBP) network Vehicle security module	GO to PINPOINT TEST H .
The liftgate window glass release is inoperative	Circuitry. Liftgate window glass release switch Liftgate window glass release actuator Vehicle security module	GO to PINPOINT TEST I .
The liftgate window glass does not release using the remote keyless entry transmitter	Remote keyless entry (RKE) transmitter battery RKE transmitter Vehicle security module	GO to PINPOINT TEST J .
The remote keyless entry transmitter has poor range performance	Aftermarket systems High power devices TV/radio transmission towers Remote keyless entry (RKE) transmitter Vehicle security module	GO to PINPOINT TEST K .
The remote keyless entry (RKE) system temporarily becomes inoperative	Mechanical door latch hardware Aftermarket systems High power devices TV/radio transmission towers Remote keyless entry (RKE) transmitter Vehicle security module	GO to PINPOINT TEST L .