Clutch Safety Switch Inputs

Clutch Safety Switch Schematic:

Clutch Safety Switch Voltage Signals:

OPERATION
Because range shifts should only be made with the manual transmission clutch fully depressed, the clutch safety switch informs the Transfer Case Control Module (TCCM) that the vehicle clutch pedal is fully depressed or released. The clutch safety switch is connected to TCCM connector pin D16. When the clutch pedal is released, the contacts of the clutch safety switch are open. When these contacts are open, a battery voltage signal is seen at TCCM connector pin D16. The TCCM interprets this signal to mean the clutch is released. When the clutch is fully depressed, the contacts of the clutch safety switch are closed. When the contacts are closed, voltage is pulled low to 0 at TCCM connector pin D16. The TCCM interprets this signal to mean the clutch pedal is fully depressed. Because TCCM connector pin D2 is not connected when the vehicle is equipped with a manual transmission, the TCCM reads a 0-volt signal at pin D2 at all times. All readings are taken while back-probing the TCCM pins with the ignition in the "Run" position. A reading of less than 0.5 volt is considered to be zero.