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Four-Wheel Drive Systems
The automatic 4-wheel drive transfer case system consists of the following:
Automatic 4WD indicator light
Brake pedal position (BPP) switch
Integrated wheel ends (IWE) solenoid
Torque on demand (TOD) relay
4WD control module — integral to the powertrain control module (PCM)
4WD high indicator light
4WD low indicator light
4WD mode select switch (MSS)
Shift position sensor
Throttle position output (TPO) from the PCM
Transmission range sensor
Average front and rear wheel speed signals from the anti-lock brake system
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