Symptom Chart

WARNING: This page is about a different car, the 2005 Ford Pickup. 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	Central junction box (CJB) fuse(s): 18 (10A). 107 (30A). Circuit or connection in universal asynchronous receiver transmitter (UART) based protocol (UBP) communication network. Vehicle security module.	REFER to MULTIFUNCTION ELECTRONIC MODULES .
The autolamps are inoperative	Circuitry. Headlamp switch. Light sensor. Vehicle security module.	GO to PINPOINT TEST F .
The autolamps are on continuously	Circuitry. Headlamp switch. Light sensor. Vehicle security module.	GO to PINPOINT TEST G .
The autolamp time delay is inoperative	Vehicle security module.	INSTALL a new vehicle security module. REFER to MULTIFUNCTION ELECTRONIC MODULES .
The headlamps are inoperative with autolamps on	Circuitry. Vehicle security module.	GO to PINPOINT TEST H .
The autolamps operate, but parking, rear or license lamps are inoperative	Circuitry. Vehicle security module.	GO to PINPOINT TEST O .