It does everything.
- Door open light
- Interior lights on/off with door
- Puddle light
- Headlights on warning with door open
- Keys in ignition warning with door open
I've even heard it can trigger your fuel pump when the door is opened, in a way to prime the system. Not sure if thats right but my car has in the past had problems starting for no apparent reason, so this may have fixed that too.
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