S10/T10 Blazer 4WD V6-262 4.3L VIN Z (1994)
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An open in circuit 75, or an open in the Turn/BU fuse would also cause this condition.
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Additionally, a park/neutral position switch that is out of adjustment may prevent a range shift in park.
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.
Vehicle Speed Input
