Quote:
Originally Posted by dazbooker
Hi am I able to upgrade interior light bulbs on my 850 estate
I heard polarity is wrong for leds
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It won't make a lot of difference, if the LED doesn't light first time fit it the other way around i.e.remove the lamp, rotate the lamp through 180° and then re-fit it, this reverses the polarity for any wedge style or festoon type lamp {the only time it won't work is for things like brake lights/ indicator lamps/dipped beam & etc. which have either offsets or specific locating lands (flat locating pins or pegs) which will only allow the lamp to be fitted in one predetermined orientation or position for which you must buy specific LED lamps, you will also need to fit ballast resistors for brake, indicator, main and dipped beam lamps in order to balance the can-bus value - LEDs give an open circuit Can-Bus value for the non-open circuit state. The value gives the failed lamp response even though the LED is working as the current is too low to give the correct can-bus response i.e. a blown incandescent bulb has the same current parameter (limit)/ signature as an functioning LED - it is possible to adjust the the value of the shunts located in the rear cargo area, but I have yet to find a data sheet to work from. (In any event the Volvo user manual bulb/lamp guide will tell you which bulb type you need in each specific location) + (NB depending upon the year of your 850 you will get a different response if yours is an OBDI rather than the post 97 OBDII compliant model) i.e do you have to interpret flashes from the unit under the bonnet or do you get a readout in your dash?
None of the internal lamps are on the can-bus system, so you shouldn't get any issue messages if you are only going to change internal lights. If you do swop over external lighting for LEDs, side markers will not be shown on the can-bus BUT as the front markers are located within the dipped beam reflector relatively few wedge LEDs will cope with the heat generated by the dipped beam lamps.
Marker lamp LED failure will occur fairly rapidly due to the heat generated by the dipped mains in my experience.