tail light bulb?
03-15-05, 08:36 PM
#1
tail light bulb?
hi, my tail light signal on my dash lighted so i changed the bulb, however that signal still stays on but on occasion goes away ,.,. then comes on again?
this is all night driving,.,.
doesnt come on at all when my lights are off.,,.
i doubt there is a loose connection?
anyone witht he same trouble?
thanks
this is all night driving,.,.
doesnt come on at all when my lights are off.,,.
i doubt there is a loose connection?
anyone witht he same trouble?
thanks
03-16-05, 05:22 PM
#4
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only explaination could be a loose connection somewhere if it's that... because i had that when i first got the car.. then i changed out the bulb and doesn't have the symbol anymore.
i would just check the car when it DOES have the symbol on and replace that particular bulb and see if it does it again.. if that doesn't work.. then iono...
i would just check the car when it DOES have the symbol on and replace that particular bulb and see if it does it again.. if that doesn't work.. then iono...
03-16-05, 08:34 PM
#6
Originally Posted by Dx3
Actually,
It is more than likely because there is a bulb in there that is too high/low wattage. This will set it off.
Jonny
It is more than likely because there is a bulb in there that is too high/low wattage. This will set it off.
Jonny
actually this makes a lot of sense,,, first off i figure these phillips 12v 194 bulbs would be a good idea to last longer but i realize it may be too strong because when that indicator is on and i roll windows up, the light goes away,.,. funny isnt it?
03-16-05, 08:39 PM
#7
Originally Posted by 96sc3
actually this makes a lot of sense,,, first off i figure these phillips 12v 194 bulbs would be a good idea to last longer but i realize it may be too strong because when that indicator is on and i roll windows up, the light goes away,.,. funny isnt it?
Jonny
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03-17-05, 06:10 PM
#9
The problem you have described sounds like one I had on my '95 SC300. The tail lamp bulbs are supposed to be type 192, not type 194. The voltage rating for both lamps is the same (14.0V). The difference between the two bulbs are their lifetime and current draw. The 194's draw less current than the 192's (.27 Amps/bulb versus .33 Amps/bulb). Since there are six tail lamp bulbs, the total current drawn if 192's are used would be 6 x .33 Amps or 1.98 Amps. With one bulb burnt out, the current would drop to 5 x .33 Amps or 1.65 Amps. If the 194's are used in place of the 192's, the total current drawn with six bulbs working would be 6 x .27 Amps or 1.62 Amps. This is less than the current that would be drawn if one of the 192's was burnt out which is why the tail lamp fault indicator comes on.
03-17-05, 06:26 PM
#10
Lexus Champion
Originally Posted by dhnash
The problem you have described sounds like one I had on my '95 SC300. The tail lamp bulbs are supposed to be type 192, not type 194. The voltage rating for both lamps is the same (14.0V). The difference between the two bulbs are their lifetime and current draw. The 194's draw less current than the 192's (.27 Amps/bulb versus .33 Amps/bulb). Since there are six tail lamp bulbs, the total current drawn if 192's are used would be 6 x .33 Amps or 1.98 Amps. With one bulb burnt out, the current would drop to 5 x .33 Amps or 1.65 Amps. If the 194's are used in place of the 192's, the total current drawn with six bulbs working would be 6 x .27 Amps or 1.62 Amps. This is less than the current that would be drawn if one of the 192's was burnt out which is why the tail lamp fault indicator comes on.
good explaination. I think that's my problem.
03-19-05, 07:42 AM
#13
A few things to keep in mind when troubleshooting these problems:
1. Bulbs that look alike may not necessarily be alike. Bulb types 158, 161, 168, 192 and 194 all look the same and are rated to operate at 14.0V, but have different lifetimes and current draws. The Lexus owner’s manual is a good place to check before buying replacements since it lists the type of bulb used in each location.
2. As bulbs age, the filament wires get thinner due to evaporation of the tungsten from their surfaces. This thinning reduces the current flow through the filament which could eventually cause the total current flow through the tail lamp bulbs to drop below the point where the tail lamp fault indicator is triggered. Also, as you may have seen happen with lights in your home, the filament can break and then re-attach creating an intermittent open circuit which sometimes the fault indicator to come on when driving over bumps.
3. Bulbs have a rated lifetime based on the results of tests to determine their mean time between failure (MTBF). Chances are that if six new bulbs were originally installed in the tail lamp assemblies and at some future point one of the bulbs burns out, the remaining bulbs are likely to burn out within a relatively short span of time. That’s why it makes sense to change them all at the same time or expect to be changing them one by one over a period of several months.
1. Bulbs that look alike may not necessarily be alike. Bulb types 158, 161, 168, 192 and 194 all look the same and are rated to operate at 14.0V, but have different lifetimes and current draws. The Lexus owner’s manual is a good place to check before buying replacements since it lists the type of bulb used in each location.
2. As bulbs age, the filament wires get thinner due to evaporation of the tungsten from their surfaces. This thinning reduces the current flow through the filament which could eventually cause the total current flow through the tail lamp bulbs to drop below the point where the tail lamp fault indicator is triggered. Also, as you may have seen happen with lights in your home, the filament can break and then re-attach creating an intermittent open circuit which sometimes the fault indicator to come on when driving over bumps.
3. Bulbs have a rated lifetime based on the results of tests to determine their mean time between failure (MTBF). Chances are that if six new bulbs were originally installed in the tail lamp assemblies and at some future point one of the bulbs burns out, the remaining bulbs are likely to burn out within a relatively short span of time. That’s why it makes sense to change them all at the same time or expect to be changing them one by one over a period of several months.
03-19-05, 03:36 PM
#15
Lexus Champion
Originally Posted by 96sc3
well.. i got it fixed, i used the 168 bulb, and it fixed my problem