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| Illustration 1 | g06202281 |
The key switch is a three position switch with two inputs into the Chassis ECM. When the key switch is moved to the ON position, a system voltage input is provided to the Chassis ECM. The presence of this voltage input will cause the ECM to transition from the "sleep mode" to the operational mode. When this mode change occurs, the ECM will initialize and then become operational.
When the key switch is moved to the OFF, the system voltage is no longer present at the ECM contact. The absence of the system voltage signals the ECM to transition from the operational mode to the sleep mode. The ECM will perform some internal power down procedures and then enter the sleep mode.
The transition period from the sleep mode to the operational mode happens in a short time. When the key switch is moved to the start position, a system voltage input will be provided to the Chassis ECM start contact. When the ECM detects this voltage and the machine system start status is correct, the ECM will initiate the engine cranking sequence.
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| Illustration 2 | g03329411 |
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Engine Speed Sensor | |
The engine speed sensor is an analog speed sensor. The sensor measures the rotational speed of the engine by generating a frequency from a passing gear tooth. This signal is sent back to both the Chassis ECM and Brake ECM.
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| Illustration 3 | g06202311 |
The headlight switch controls the operation of the headlights, taillights, and parking lights. The switch is a three-position switch. The lowest switch position does not turn on any lights. The middle switch position turns on the taillights and parking lights. The top position turns on the taillights, parking lights, and headlights.
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| Illustration 4 | g06202335 |
The fog lamp switch controls the operation of the fog lamps. This switch is a two-position switch.
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| Illustration 5 | g06202372 |
The curb vision lamp switch controls the operation of the lamps along the bottom left and right side of the machine. This switch is a two-position switch.
Work Lamps / Rear Side Lamps Switch
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| Illustration 6 | g06202403 |
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Work Lamp / Rear Side Lamps Switch | |
This dual position switch is used to turn on the Work lamps (when toggled at the top) or the Rear Side lamps (when toggled at the bottom). When the switch is in the center position the lamps are off.
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| Illustration 7 | g06202832 |
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Stairway Lamp Switch | |
This two-position switch is used to turn on the lamp for illuminating the retractable stairway at the cab.
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| Illustration 8 | g03329555 |
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Backlight Dimmer Switch | |
The Backlight Dimmer switch controls the brightness level of the backlights in the cab. The switch is a momentary switch with an increment and a decrement contact. When the switch is placed into either the increment or decrement states, the corresponding ECM contact is momentarily connected to ground. When the switch is not being activated, the ECM contacts float to a high-voltage state. The ECM determines the operator request from this switch and then changes the output level accordingly.
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| Illustration 9 | g06202855 |
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Hazard Switch | |
RH Window Switch / LH Window Switch
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| Illustration 10 | g06202429 |
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Window Control Switch | |
The windows inside the cab are each controlled by a momentary switch that is mounted on the armrest of the door. Press the switch and release the switch when the desired window height is observed.
RH Door Switch / LH Door Switch
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| Illustration 11 | g06202412 |
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Door switch and electrical schematic representation | |
The switches are mounted inside the door jam on each of the doors of the cab. When either of the doors are opened, the dome light is turned on.
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| Illustration 12 | g06202449 |
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The wire connections for the switch (not shown here) are distinguished by color. (1) Mirror 1 Up or Down (Wire Color: Yellow) (2) Battery (Wire Color: Red) (3) Ground (Wire Color: Black) (4) Mirror 2 Up or down (Wire Color: Green) (5) Mirror 1 Left or right (Wire Color: Orange) (6) Common (Wire Color: White) (7) LED (Wire Color: Purple) (8) Mirror 2 Left or Right (Wire Color: Blue) | |
This switch can be used to control both of the mirrors for the truck in all directions (up, down, left and right).
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| Illustration 13 | g06202785 |
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Heated Mirror Switch | |
This monetary switch will activate a heating element within the mirror for a fixed period of time.
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| Illustration 14 | g06202805 |
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Right-hand Map Lamp Switch | |
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| Illustration 15 | g06202894 |
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Ultrasonic Fuel Level Sensor | |
The level in the fuel tank is measured using an ultrasonic emitter. After the signal is received by the ultrasonic sensor, the time difference between the signal launch and return signal is calculated by the Chassis ECM. The greater the time between sending and receiving the signal, the higher the fuel level in the tank. The Chassis ECM communicates with the Advisor to update the fuel level display. The performance screen in Advisor also displays a digital readout of the percentage of fuel remaining.
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| Illustration 16 | g03329482 |
The heated mirrors switch is a single pole switch. The switch controls the operation of the heated mirrors. When the switch is activated, the heated mirrors are activated.
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| Illustration 17 | g03329483 |
The backup alarm is a speaker driven by the ECM. The alarm sounds when the transmission is placed into REVERSE to warm that the vehicle may move in the reverse direction.
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| Illustration 18 | g03329494 |
The starter relay controls the operation of the starter motor. The relay acts as an electrical switch. The ECM energizes the relay which then allows a connection from the battery to the starter motor.
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| Illustration 19 | g03329533 |
The machine lockout lamp is an indicator light which informs the operator when the machine has been locked out. The chassis ECM energizes the light by acting as the return line for the light.
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| Illustration 20 | g03329533 |
The crank lockout lamp is an indicator light which informs the operator when the starter has been locked out. The chassis ECM energizes the light by acting as the return line for the light.
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| Illustration 21 | g03323937 |
The rear WAVS relay controls the operation of the reverse lights. The relay acts as an electrical switch. The ECM energizes the relay, which then allows a power source to flow to the lights.
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| Illustration 22 | g03323937 |
The heated mirror relay controls the operation of the heater coils in the mirrors. The relay acts as an electrical switch. The ECM energizes the relay, which then allows a power source to flow through the heater coils.
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| Illustration 23 | g03329581 |
The crank lockout switch controls the operation of the starter. When the crank lockout switch is not engaged, the machine functions normally with the starter being controlled by the key switch. When the switch is activated, power is provided to the ECM the same as a key ON position, but the starter cannot be activated. The switch is a two pole switch. The ECM contact floats to a high-voltage state when the switch is open. The ECM contact is pulled to a low voltage state when the switch is closed.
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| Illustration 24 | g03329585 |
The machine lockout switch prevents the machine from operating when the switch is activated. The switch is a single pole switch. The ECM contact floats to a high-voltage state when the switch is open and is pulled to a low voltage state when the switch is closed.