BRAKE WARNING LIGHT/ABS WARNING LIGHT/ELECTRIC VACUUM PUMP WARNING LIGHT
2016 – MX-5 – Brakes
BRAKE WARNING LIGHT/ABS WARNING LIGHT/ELECTRIC VACUUM PUMP WARNING LIGHT
Purpose/Function
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If a malfunction is detected in the system with the parking brake released, the brake system/ABS warning light illuminates to notify the driver.
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The brake system/ABS warning light illuminates during a system malfunction, and the control is as follows:
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ABS control disabled.
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ABS and EBD controls disabled.
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If the following signal malfunction is detected in the electric vacuum pump system, the electric vacuum pump warning light illuminates to notify the driver:
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Vehicle speed signal
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Engine speed signal
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Brake fluid pressure signal
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DSC system status signal
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Vacuum sensor 1 signal
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Vacuum sensor 2 signal
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The simultaneous illumination of the brake warning light and electric vacuum pump warning light notifies the driver that the power brake unit vaccum may fail and a malfunction might occur.
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The brake system warning light illuminates when the parking brake is applied,
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ABS warning light illuminated:
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ABS warning light and brake system warning light illuminated:
Construction/Operation
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The brake system/ABS/electric vacuum pump warning light is built into the instrument cluster.
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When the DSC system, electric vacuum pump system and CAN lines are functioning normally, the brake system/ABS/electric vacuum pump warning light illuminates when the ignition is switched ON to check for a burned-out bulb, and then turns off after approx. 3 s. At this time, while the parking brake is activated, the brake system warning light remains illuminated, however, it turns off after the parking brake is released.
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If a malfunction is detected in the DSC system with the parking brake released, the DSC HU/CM sends the brake system/ABS warning lights request signal. When the instrument cluster receives the brake system/ABS warning lights request signal from the DSC HU/CM, the microcomputer turns the transistor on and a ground circuit with the brake system/ABS warning light is established. Therefore, the brake system/ABS warning light illuminates.
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If a malfunction is detected in the electric vacuum pump system with the parking brake released, the electric vacuum pump CM sends the brake system/electric vacuum pump warning lights request signal. When the instrument cluster receives the brake system/electric vacuum pump warning lights request signal from the electric vacuum pump CM, the microcomputer turns the transistor on and a ground circuit with the brake system/electric vacuum pump warning light is established. Therefore, the brake system/electric vacuum pump warning light illuminates.
Fail-safe
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Function not equipped.