One Or Both Low Beams Are On Continuously - Except China
Refer to Wiring Diagrams Cell 85 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).
DTC Fault Trigger Conditions
Description | Fault Trigger Conditions | |||
|---|---|---|---|---|
DTC | ||||
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. | ||
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. | ||
B1D00:15 Left Low Beam: Circuit Short to Battery or Open | A continuous memory and on-demand DTC that sets when the BCM detects a short to voltage from the LH low beam output circuit. | |||
B1D01:15 Right Low Beam: Circuit Short to Battery or Open | A continuous memory and on-demand DTC that sets when the BCM detects a short to voltage from the RH low beam output circuit. | |||
Possible Sources
Wiring, terminals or connectors Headlamp switch BCM
Visual Inspection and Diagnostic Pre-checks
Inspect the headlamp switch for damage.
PINPOINT TEST D : ONE OR BOTH LOW BEAMS ARE ON CONTINUOUSLY - EXCEPT CHINA
D1 CHECK LOW BEAMS OPERATION
Ignition ON. Place the headlamp switch in the OFF position. Observe the operation of the LH and RH low beam.
Are both low beams illuminated?
Yes | GO to D2 |
|---|---|
No | GO to D7 |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.