Question about 1996 Mercedes-Benz C-Class

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The dash light remail illuminated when the car is off 1998 c180

The temperature , clock and mileage remain lit when the car is switched off

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Sounds like a relay has fused its contacts together causing this fault,but iam not sure exactly where the fault would lay without following the power source back along the feed.This could take a while depending on what has to be removed to find the feed wires

Posted on Jan 23, 2009

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I need to know what controls the lights that illuminate the radio and heater controls on a 1998 Cadillac Seville. the displays are working. Just not the buttons on each are not lit


head light switch make sure you don't have the instrument panel dimmed all the way down if so turn it up, then if that doesnt work make sure your head lights are turning on when they are suposed to, if not you may have a bad light sensor on the dash or bad headlamp switch.

Feb 24, 2015 | 1998 Cadillac Seville

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Radio, clock and dome light not working


Had this before and i found a fault on the fuse board ,no supply the printed circuit maybe as i didnt go any further i just looped it from another fuse that had power via ignition switch through the radio fuse and it all worked but the fuse for the radio wasnt the one i looped as that had power for the memory it was another one that done the interior light and a thin bit of telephone wire done the trick so check all the fuses for power ,pull them out and check with a little 12v screwdriver light thing from the chinese shop ,right star trek is about to start goodnight

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The mileage sensor is out on my 99 expedition, were can i locate it to get it to work?


I have a 1999 Ford Expedition with a 5.4L Engine and don't know what you are talking about. I searched under mileage sensor for the 99 expedition but could only find On-Board Warning Systems.

Are you talking about the Vehicle Speed Sensor?

If so, this is located near or on the transmission and has wires that go into the harness, and basically is a pickup coil that detects movement of the transmission which then controls mileage on the odometer and the speedometer.


prev.gif next.gif On-Board Warning Systems Turn on the ignition switch in almost any vehicle and watch the instrument panel. The modern automobile has an abundance of warning lights that provide valuable information. The list could include:
  • Brake system warning
  • Windshield washer fluid level
  • Coolant level
  • Brake fluid level
  • Door ajar
  • Headlamp door position
  • EGR or Check Engine
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  • ABS or Anti-lock Brake System
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  • Brake lining wear indicator light. The high price of fuel created a demand for yet another light--the fuel economy warning system. When the light comes on, it tells the driver he or she is pushing too hard on the gas pedal. High manifold vacuum equals good gas mileage and vice versa. The system simply reads manifold vacuum from a sensor, and when it drops to a predetermined level, a circuit is completed and the light is lit. This has become in many models what is known as the up-shift light. An arrow on the dash indicates the time to shift into the next gear to obtain optimum fuel economy. If a warning light comes on, you must find out why. It means there is a problem either in the system being monitored or in the warning lamp circuit. Finding the actual fault is important and not very difficult. However, a wiring diagram may be needed to prevent confusion. Looking at the typical warning light circuit, you'll see that the bulb is most often supplied with current through the ignition switch. Further examination reveals the most common way of completing the circuit and getting the bulb to light is by means of a sensor, which completes the ground connection. In this case, sensor is a fancy word for a switch that turns on or off according to specific conditions. Consider a typical oil pressure warning light system. Current from the ignition switch flows through the warning lamp and from there to ground through the oil pressure switch. This particular switch is normally closed and the circuit is complete until the switch opens in response to oil pressure in the engine. Just the opposite is true with the coolant temperature sensor. It is normally open and only completes the circuit when an internal element expands (in response to heat) to close the contacts. If the vehicle has a cold engine warning lamp, the sensor includes two sets of contacts. One set is normally closed and opens as the internal element expands. This action breaks the ground circuit to the warning lamp. The other set of contacts functions if the temperature rises far enough to close them, turning on the high temperature warning. If either of the temperature lights is lit while the engine seems normal, just unplugging the wires from the sensor will provide valuable diagnostic information. If the lights remain lit, there's a short to ground in the wiring from the lamp to the sensor. The service needed isn't to the cooling system, but to the warning system. If the lights go out with the wires unplugged and the engine seems normal, it's entirely possible that the sensor has failed and needs to be replaced. Nevertheless, don't just unplug the wires and forget about them. This could be disastrous for the vehicle owner should a cooling problem develop without warning. Fig. 1: Typical coolant temperature sending unit location 84926079.gif
    Fig. 2: Oil pressure sending units may be located in a variety of places on the engine 84926080.gif

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    When my headlights come on at night, the dash lights will not come on and the radio illumination behind the clock goes out. Why is this?


    Check the dimmer switch to your dash light. If there turned down, your dash and radio illumination light will be dime or not working at all. Keep me posted, be glad to know if it is the dimmer switch turned down or you dimmer switch has gone bad. Good luck

    Nov 02, 2009 | Pontiac Grand Am Cars & Trucks

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    Ford ranger 1998. no illumination readout for channels and clock.other lights work on radio.iS THIS REPAIRABLE?


    Please don't take this as an insult, but have you adjusted the dim switch that you can adjust the brightness of your dash lights? I have a wheel on my dash that you can turn up or down the brightness and right after I get to the brightest is turns on the dome light. Are you sure this is not your issue?

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    No heat. Blower works fine. Noticed that the temperature control knob is not illuminated. All other knobs are illuminated. The outside/recirc air actuator is working properly.


    If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox

    Tech JK
    -----

    Sep 19, 2009 | 2006 Pontiac Torrent

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    Loose bulb in dash that illuminates the vent control. How do I dis-assemble the dash to get to the bulb?


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