Pinpoint Test H : The Ambient Lighting Is Inoperative Or Always On: 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 Interior Lamps for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Interior Lighting - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1088:86 | LIN Bus "B": Signal Invalid | A continuous memory DTC that sets when the BCM loses communication with the ambient lighting module over the LIN circuit. |
| B1088:88 | LIN Bus "B": Bus Off | A continuous memory DTC that sets when the BCM loses communication with the ambient lighting module over the LIN circuit. |
| B1390:83 | Ambient Light Control Module: Value of Signal Protection Calculation Incorrect | A continuous memory DTC that sets when the BCM determines a communication error has occurred on the LIN. This DTC may be caused by an open in the ambient light control module power or ground circuit or an open in the LIN circuit between the ambient light control module and the BCM. |
| B1390:87 | Ambient Light Control Module: Missing Message | A continuous memory DTC that sets when the BCM loses communication with the ambient lighting module over the LIN circuit. |
Possible Sources
- Wiring, terminals or connectors
- Ambient lighting LED
- BCM