Pinpoint Test B : The AUTOLAMPS Are On Continuously: Notes
WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Headlamps/Autolamps for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Exterior Lighting - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1A85:21 | Ambient Light Sensor: Signal Amplitude < Minimum | A continuous memory DTC that sets when the BCM detects a short to ground from the light sensor input circuit. |
| B1A85:22 | Ambient Light Sensor: Signal Amplitude > Maximum | A continuous memory DTC that sets when the BCM detects an open or short to voltage from the light sensor input circuit. |
| B1A85:2F | Ambient Light Sensor: Signal Erratic | An on-demand DTC that sets when the BCM self-test detects an open, short to voltage or short to ground from the light sensor input circuit. This DTC sets in conjunction with B1A85:21 or B1A85:22. Follow the diagnostics for B1A85:21 or B1A85:22. |
Possible Sources
- Wiring, terminals or connectors
- Light sensor
- BCM
Visual Inspection and Diagnostic Pre-checks
- Inspect the headlamp switch for damage.
- Inspect the light sensor for damage.