Pinpoint Test H : The Brake Warning Indicator Is Always On: 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 Instrument Cluster for schematic and connector information.
Normal Operation and Fault Conditions
See Brake Warning Indicator and ABS/Brake/Stability-Traction Control System Indication descriptions and see Brake Fluid Level Switch component description. Refer to: Instrument Panel Cluster (IPC) - System Operation and Component Description .
If the brake (red) warning indicator request, brake fluid level low request or parking brake (red) warning indicator request messages are missing for 5 seconds or longer, the IPC defaults the brake warning indicator on.
BCM DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1048:01 | Brake Fluid Level Switch: General Electrical Failure | A continuous and on-demand DTC that sets in the BCM when the BCM detects an open on the brake fluid level switch input. |
| B1048:7B | Brake Fluid Level Switch: Low Fluid Level | An on-demand DTC that sets in the BCM if the BCM detects a low brake fluid level input from the brake fluid level switch. |
Possible Sources
- Wiring, terminals or connectors
- Brake fluid level switch
- Parking brake position switch
- Communication concern
- ABS concern
- BCM
- IPC
Visual Inspection and Diagnostic Pre-checks
Inspect the:
- base brake system and the parking brake system for correct operation.
- brake fluid level switch connection and check for signs of connector terminal damage, corrosion or pushed-out pins.
- brake fluid level switch wiring for signs of a cut or opened circuit.
- brake fluid level switch for signs of any external damage.