2005 Ion, turn signal problem?

I have a 2005 Ion with a sick turn signal. One of the two filaments
burned out. Saturn conveniently made the replacement operation
tool-free. Replaced the bulb and it still doesn't blink.

Checked the bulb and in-headlamp assembly wiring with an ohmmeter and
by hooking it up to a 12 volt supply. That leaves the control
circuitry.

I've heard of this happening on 2003's and 2004's. Anybody run into
this on a 2005?

And last, the bulb has 2 filaments, one higher wattage than the other.
Which way is it supposed to go in? The bulb is symmetrical with no
polarity markings.

Thanks!

 

Check underhood fuse block.

Hopefully you didnt backfeed into the BCM.

Not related.

Polarity does not matter to a light bulb. One filament is for the
hazard/parking lights, the other is for the turn signal. If you still
have problems check all of your bulbs.

 

Will do, thanks!

I did the checks after taking the assembly into the house. It's dark
and cold at night. Have to say, I like how they mount the lamp
assembly. There's nothing like no-tool installation.

The phrase polarity wasn't quite right; there aren't + and - terminals
on a bulb. However, plug it in one way and the parking light gets the
brighter filament. Take it out, rotate 180 and plug back in, the
parking light gets the dimmer filament. This seems like an
application begging for a key/tab/asymmetric layout.

Thanks!

 

The center connection should be the ground, one outer one is for parking
lights, the other outer is for the turn indicator. The brighter one is
the turn signal of course. Yeah there should of been an asymmetrical tab
so it can only be inserted one way if one filament is brighter. Keep in
mind you can use your hazard lights to help see if any bulbs are burned
out.