a) Disconnect the switch connector. Ground the connector terminal.
b) turn on the ignition: the indicator lamp should light.
2. Checking the operation of the brake fluid level switch sensor.
a) check for conductivity between the sensor terminals when the float is raised.
b) check for conductivity between the sensor terminals with the float lowered.
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Replace the sensor switch if necessary.
3. Checking the operation of the parking brake switch.
(yY, YH series)
a) Check for continuity between the switch terminals when the parking brake lever is raised.
b) check for continuity between the terminals of the switch with the parking brake lever lowered.
(lY, LH series)
Check the switch circuits according to the table.
If the conductivity of the circuits differs from the specified one, replace the switch.
4. Checking the operation of the vacuum circuit breaker.
a) check for the absence of conductivity between the switch terminals when the vacuum on the switch is 270-325 mm Hg.
b) check for conductivity between the switch terminals in the absence of vacuum.
