Operation - Section 3 08/07 OM3018 Page 3-34 Operating Instructions 52. Exhaust Brake Switch (Optional) 54. Central Warning Lamp (Red Convex Lens) For operation of the Exhaust Brake Switch (52, Fig- ure 3-6), refer to the following switch positions: The exhaust brake is actuated when the foot brake is depressed or the retarder control lever is oper- ated and the torque converter is in the lockup condition. This Central Warning lamp (54, Figure 3-6) flashes whenever an abnormality has occurred in any one of the following systems:
Battery Charging Monitor Emergency Steering Monitor Parking Brake Monitor Body Float Monitor Automatic Transmission Monitor (Mechatronics) Suspension Monitor Fuel Level Monitor. Position Off The exhaust brake is actuated when the accelerator pedal is released and the torque converter is in lockup condition. Position On 53. Fog Light Switch (Optional) (Refer to “ENGINE START-UP SAFETY PRAC- TICES” and “WARNING & CAUTION LAMPS”.) This lamp flashes, and at the same time an alarm buzzer sounds intermittently , whenever an abnormal- ity has occurred in any one of the following systems:
Air Pressure Monitor; Coolant Temperature Monitor; Torque Converter Oil Temperature Monitor; Retarder Oil Temperature Monitor; Coolant Level Monitor; Engine Oil Pressure Monitor; or Transmission Oil Filter Monitor. Fog Lights are optional equipment. If truck is equipped, they are useful in foggy conditions and heavy rain. This lamp will also flash and the alarm buzzer will sound, if the parking brake is applied and range selector lever is not at Neutral . Fog lights are off when switch (53, Figure 3-6) is in this position (out/light "Off"). Depressing the switch to this position (in/light "On") turns fog lights on.