Pinpoint Test C : One Or Both Low Beams Are On Continuously: Notes

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Wiring Diagram Headlamps/Autolamps for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Exterior Lighting - Overview .

REFER to: Exterior Lighting - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
B143B:11	Autolamp On Input: Circuit Short to Ground	An on-demand DTC that sets when the BCM detects a short to ground on the autolamp on input circuit.
B143C:11	Headlamp Off Input: Circuit Short to Ground	An on-demand DTC that sets when the BCM detects a short to ground on the headlamp off input circuit.
B143D:11	Headlamp On Input: Circuit Short to Ground	An on-demand DTC that sets when the BCM detects a short to ground on the headlamp on input circuit.
B143E:11	Headlamp Switch Input: Circuit Short to Ground	A continuous memory DTC that sets when the BCM detects a short to ground on the headlamp switch input circuits.
B143E:15	Headlamp Switch Input: Circuit Short to Battery or Open	A continuous memory DTC that sets when the BCM detects an open or short to voltage on the headlamp switch input circuits.
B1447:11	Parklamp On Switch Input: Circuit Short to Ground	An on-demand DTC that sets when the BCM detects a short to ground on the parklamps on input circuit.
B1087:00	LIN Bus "A": No Sub Type Information	A continuous memory and on-demand DTC that sets in the HCM if communication is lost with the adaptive front lighting module.
B1088:00	LIN Bus "B": No Sub Type Information	A continuous memory and on-demand DTC that sets in the HCM if communication is lost with the adaptive front lighting module.

Possible Sources

Wiring, terminals or connectors
Headlamp switch
BCM

Visual Inspection and Diagnostic Pre-checks

Inspect the headlamp switch for damage.