12.14
ELECTRICAL
BRAKE SWITCH
Function Test
Applying the brakes closes a switch to activate the brake lamps.
Use a multimeter to test for continuity when the brakes are
applied.
Replace the brake switch if function does not pass test.
AWD / ADC COILS
Operation Overview
• Battery voltage is always present at the AWD and ADC
coils when the CHASSIS relay is active.
• AWD and ADC coil voltage is protected by the 20A
DRIVE fuse.
• Battery voltage is always present at the ADC / 4x4 / 2x4
RH switch assembly whenever the CHASSIS relay is
active. The circuit is also protected by the 20A DRIVE
fuse.
• The ECU controls all ADC and AWD functions.
Diagnosing System Failures
• Verify the ADC/AWD switch is functional and that a
minimum of 11 volts is present at the hub coil
connection.
• Verify the ADC/AWD hub coil is functional. Test the
AWD hub coil using a multimeter.
• Verify the wiring harness, wiring, connectors,
connector pins and grounds are undamaged, clean and
connected properly.
• Verify continuity of wire connections with a known
good volt/ohm meter.
• Verify the coil wires are not connected or shorted to
ground.
IMPORTANT: Verify all wires and wiring connections
have been tested properly with a known good volt/
ohm meter before suspecting a component failure.
80% of all electrical issues are caused by bad
connections and/or grounds.
Brake Switch Test
Pin 1 Pin 2
Brakes Not Applied
Brakes Applied
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