Normal Operation
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
When the headlamp switch is placed in the PARKING or HEADLAMP ON position, the smart junction box (SJB) supplies either a pulse width modulated (PWM) signal or 12 volts to the various backlighting sources in the instrument panel, doors and console.
- DTC B2027 (LED Backlighting Output Circuit Failure) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground on the dimmable backlighting circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- SJB