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Code A094 - Brake Switch Contacts Always Closed: Notes

This test is run to determine proper operation of brake switch. This is important because ABS is activated when brake switch is on and turned off when brake switch is off. If brake switch is always on, ABS operation will always be requested, resulting in potential modulator cycling on rough roads. This failure will result in a dead battery, due to brake lights staying on. ABS warning light will flash to indicate malfunction, but ABS will not be disabled.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This checks if malfunction is currently present.
  2. This step isolates cause of malfunction to either a malfunctioning or misadjusted brake switch, or a short to voltage in brake switch circuitry.
  3. This step checks for unwanted voltage on brake switch input circuit.
  4. This step checks for a possible intermittent malfunction.
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