Brake Warning Indicator

The Brake Warning Indicator illuminates when the when one or more of the following occurs:

• The EBCM performs the bulb check. The EBCM applies ground to the ABS pressure differential sensor signal circuit.
• The brake pressure differential switch is closed by a pressure differential between the front and rear brake circuits. The brake pressure differential switch applies ground to the ABS pressure differential sensor signal circuit.
• The power brake booster fluid flow and pressure are detected as being low (w/UJ1 Only). The power brake booster fluid pressure and fluid flow alarm switches both close, applying ground to the brake fluid level sensor signal circuit. In turn, the P/B Booster Fluid Flow And Pressure Alarm Delay Module applies ground to the brake warning indicator supply voltage 2 circuit. The power brake booster fluid flow alarm also sounds when this occurs.
• The park brake is engaged. The park brake warning switch applies ground to the brake warning indicator control circuit.
• The ignition is turned to START. The ignition switch applies ground to the brake warning indicator control circuit.