Instruments and Controls Identification Manual Override Push Button, Optional Engine Shutdown System 1 2 3 4 5 If the vehicle is equipped with an engine shutdown system with a manual override push button ( Fig. 2.4 ), simultaneously depress the engine start button and the manual override push button. Once the engine has started, release the engine start but- ton, but continue to depress the override push button until the warning bell stops. 01/18/95 f600068a 1. Ignition Switch 2. Engine Start Button 3. Manual Override Push Button 4. Mirror Heat Switch 5. Right-Side Power Mirror Switch Mirror Heat Switch, Optional Fig.
2.4, Ignition/Start/Override/Mirror Switches One or both outside door mirrors can be heated to keep them defrosted. Whenever the mirror heat switch ( Fig. 2.4 ) is on, an indicator light illuminates on the warning and indicator light module. system, air dryer, backup lights, and all of the electri- cal systems that are operable in the "Off" position are operable in the "Accessory" position. In the "On" position, the key is turned clockwise. All electrical systems are operable. Low air- and oil- pressure warning lights and buzzer operate until the engine is started and pressure is built up. The engine can be started and operated only when the ignition switch is on.
Power Mirrors Both outside mirrors can be equipped with an electri- cal remote control. Move the toggle switch ( Fig. 2.4 ) to adjust the mirror. Detroit Diesel Electronic Engine Control (DDEC) Operator Control For vehicles built to operate in Canada, switching on the ignition and releasing the parking brakes auto- matically activates the headlight low beams (later model vehicles) or high beams (earlier model ve- hicles) at half voltage as daytime running lights. The daytime running lights will operate until the parking brakes are applied; then they will switch off. Turning on the regular headlights will override the daytime running lights.
The vehicle cannot be driven unless either the headlights or daytime running lights are activated. The DDEC system is centered around a computer that is programmed to automatically control engine timing and fuel injection, providing maximum engine performance and fuel economy. Some DDEC II ® systems have an automatic engine shutdown option. This option will shut down the en- gine if potentially damaging conditions are detected. An override button (on DDEC II engines, this button is labelled "Override") is provided for emergency situ- ations. It is mounted to the right of the ignition switch, and provides the driver with an extra 30 sec- onds of engine operating time.
Engine Start Button CAUTION Standard DDEC III ® systems will shut down the en- gine if sensors indicate an emergency engine condi- tion such as low coolant level, high coolant tempera- ture, or high oil temperature. If such a condition occurs, the yellow "Check Engine" light in the lightbar will glow. If the problem gets bad enough to cause possible engine damage, the DDEC III will gradually cut engine power down to 70 percent of original power. At that point, the red "Shutdown Engine" light will turn on, and 30 seconds later, DDEC III will shut down the engine. Do not push the engine start button with the en- gine running. To do so could result in starter damage.
With the ignition switch on, push the engine start but- ton ( Fig. 2.4 ) to engage the electric or air starter. See the applicable engine operating instructions in Chapter 7 for complete starting instructions. On vehicles equipped with a Neutral start switch, the transmission must be in Neutral before the engine can be started. 2.3