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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 925 (Instrument Cluster System) >> Diagnostic Tests >> Instrument Cluster (IC) >> Pinpoint Tests >> Pinpoint Test I: The Brake Warning Indicator Is Always On >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

The brake warning light is used to indicate low fluid level (base brake system concern) or a parking brake that is not fully released. The instrument cluster is hardwired to the parking brake switch through circuit CCB09 (GY/BU) for parking brake status. The instrument cluster is hardwired to the anti-lock brake system (ABS) module through the electronic brake distribution (EBD) line, circuit CCA02 (BK/BU), for brake fluid level concerns. When the parking brake is applied, the instrument cluster receives a ground and turns on the brake warning indicator. When brake fluid is low or the ABS module detects a base brake system concern, the ABS module sends the instrument cluster a signal through the EBD line and the instrument cluster turns on the brake warning indicator. If the instrument cluster detects fault condition in either the base brake system (low brake fluid level) or ABS, both the brake and ABS warning indicators are turned on.

Possible Causes

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