Normal Operation
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The Smart Junction Box (SJB) sends a voltage signal to the headlamp switch and the light sensor.
When the headlamp switch is placed in the AUTOLAMPS ON position, the voltage signal is routed to ground. When the SJB detects the headlamp switch in the AUTOLAMPS ON position, the SJB monitors the light sensor input. The light sensor determines the amount of light based on the input received from the ambient lighting conditions. When the ambient level has reached a point (determined by the internal programming of the SJB ), the SJB provides voltage to the headlamps, parking and license plate lamps.
DTC DESCRIPTION CHART
| DTC Description | Fault Trigger Conditions |
|---|---|
|
An on-demand DTC that may set when the SJB detects a short to ground from the autolamps on input circuit. |
|
An on-demand DTC that sets when the SJB detects an open from the light sensor input circuit. |
|
A continuous and on-demand DTC that sets when the SJB detects a short to ground from the light sensor input circuit. |
|
An on-demand DTC that sets when the SJB detects a short to ground from the wipers on input circuit. |
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Light sensor
- Headlamp switch
- Wiper motor
- SJB