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When the ASTC indicator lamp flashes at a rate of 2 Hz, the ASTC is prohibited.
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This operation is performed for the following reasons and is not a malfunction.
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- ASTC-ECU calculates the estimated temperature of the brake pad. In general,
as the brake pad temperature increases, the coefficient of friction for the brake pad becomes
smaller, resulting in the reduced braking force. When the estimated temperature of the brake
pad reaches the specified value or more, ASTC-ECU flashes the ASTC indicator lamp at a rate
of 2 Hz to warn the driver that the brake controllability by ASTC is decreased by the reduced braking
force. Consequently, ASTC-ECU prohibits the ASTC control until it determines that the estimated temperature
of the brake pad is normal.
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