2005 V70 light weirdness car has ESP

IslandV70 · Post by **IslandV70** » 02 Feb 2019, 17:36

My car has the orange side marker lights behind the front wheels. They were on all the time. I thought to myself the other day I might try and rewire them as turn signal lights.
Today - they ARE turn signal lights.

Are they going to randomly change back?

Post by **abscate** » 02 Feb 2019, 18:44

Is this on the 2005?

Those lights run on the CANBUS so it isn't a simple power/ground troubleshooting

The side markers should flash with the turn signals

IslandV70 · Post by **IslandV70** » 02 Feb 2019, 18:45

They do flash with the turn signals - NOW. Prior to tonight they were just on.

Post by **RickHaleParker** » 02 Feb 2019, 23:32

Cognitive bias, factually they always have been turn signals.

Post by **abscate** » 03 Feb 2019, 03:21

You've fixed them by posting. Powerful stuff, this internet thingy.

Post by **jimmy57** » 03 Feb 2019, 08:12

Those can come on if there is an issue with connections in front turn/park light bulbs or sockets. If they have LEDs in them (original are not LED) then they can be on dimly then flash as normal as turn signals.
The CAN bus doesn't run any bulbs as it is only communication but the modules on CAN bus run the bulbs. The "CAN error free" term used for bulbs is not accurate. The modules on CAN equipped vehicles in most cases use transistor direct control for some (99-2004) or almost all (2005->) bulbs. The transistor circuitry is what is finicky about bulbs. The transistor circuits also diagnose bulb issues and that is done by applying low amperage, low voltage in the bulb circuits. Also the transistor controlled circuits can have the theatrical lighting effect where bulbs fade in and fade out when switched on and off. The diagnostic low current can light some LED bulbs dimly. LEDs usually are polarized and use pulsing circuits to control LED voltage. Bulbs installed wrong polarity won't work and the pulsing circuit can give feedback that can not only make the circuit go off but could cause unusual issues with other lights not working properly or at all. The error free bulbs sold have filtering to stop the pulse feedback and also can have resistor fitted to give similar load as regular filament bulb so the low current doesn't set bulb codes. Some circuits will shut off power if the bulb load is wrong.

IslandV70 · Post by **IslandV70** » 04 Feb 2019, 10:47

Light weirdness Part II. When I bought the car, the LED side markers in the right rear tail light lens were out. The dealer got another lens and it didn't work either. They got another lens after that and it did work - until now. The LEDs are dead again. What the.....
Am I just having bad luck with lenses or is their an LED specific connection or setting to check?
Thanks!
In other light news, it was so foggy this morning I could hardly see one end of the car from the other end. I used my rear fog light for the first time. That one works at least

Post by **abscate** » 04 Feb 2019, 11:06

I think putting LEDs in these was the mistake. They are designed for operation with and monitoring of standard bulbs.

IslandV70 · Post by **IslandV70** » 04 Feb 2019, 12:37

There is no choice in the matter - the LEDs are molded into the lens. They point to the side.

Post by **jimmy57** » 04 Feb 2019, 20:44

on the later V70 lamps the side marker feature of the rear lamps is a card with a few, maybe 4, LEDs.