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Re: the dash light remail illuminated when the car is off...
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
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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.
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
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.
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
Brake fluid level
Headlamp door position
EGR or Check Engine
High beam indicator
Cold engine warning
ABS or Anti-lock Brake System
SRS or Supplemental Restraint System
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
Fig. 2: Oil pressure sending units may be located in a variety of places on the engine
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
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?
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
For general awareness, the outside air temperature sensor is located above the inside mirror. Try to reset the temperature measurement unit:1. Switch engine on.2. Press and hold clock minute (min) and hour (h) buttons simultaneoutly longer than 3 seconds. The display will show new temperature measurement unit.