Headlights not working MKV Prelude
Posted: Tue May 28, 2019 4:41 pm
Seems the issue wasnt the nasty aftermarket headlights. I found a replacement OE set and this is what happens.
Dipped beam = Drivers side - Dipped beam bulb ON, half brightness. Gives 12v earthed to body
- Full beam bulb ON, half brightness, Shows 0 volts
Passenger side - Dipped beam bulb ON, full brightness, Gives 12v earthed to body
- Full beam bulb ON, half brightness. Gives 12v earthed to body
Full beam = Drivers side - Dipped beam bulb OFF, Shows 0 volts
- Full beam bulb OFF, Shows 0 volts
Passenger side - Dipped beam on, full brightness, Gives 12v earthed to body
- Full beam on, full brightness. Gives 12v earthed to body
All bulbs and holders in headlights have continuity. Wierdly as do all the connections that plug into the back of the headlights, each of the 4 connections show continuity across pins and continuity from power pin to earthing bolt on the wing for either side.
What am I looking at with all this? Is it wiring or relay issues? Its as though both of the bulbs in the passenger side are acting as high beam, which is why drivers side is turning off completely, with low beam spread across all 4 main bulbs although passenger side low beam is at full level brightness. Yet the two are seperate sections of loom, they dont bridge under the bumper support like they do on other cars. The driver side loom seems to do drivers side headlight, driver side fan switch and both horns, it also has one unused honda type connector set low and one unused single round pin conenctor similar to a HT lead. Passenger does passenger headlight and passenger side fan switch, AC motor and has mirrored one unused honda type connector set low.
Dipped beam = Drivers side - Dipped beam bulb ON, half brightness. Gives 12v earthed to body
- Full beam bulb ON, half brightness, Shows 0 volts
Passenger side - Dipped beam bulb ON, full brightness, Gives 12v earthed to body
- Full beam bulb ON, half brightness. Gives 12v earthed to body
Full beam = Drivers side - Dipped beam bulb OFF, Shows 0 volts
- Full beam bulb OFF, Shows 0 volts
Passenger side - Dipped beam on, full brightness, Gives 12v earthed to body
- Full beam on, full brightness. Gives 12v earthed to body
All bulbs and holders in headlights have continuity. Wierdly as do all the connections that plug into the back of the headlights, each of the 4 connections show continuity across pins and continuity from power pin to earthing bolt on the wing for either side.
What am I looking at with all this? Is it wiring or relay issues? Its as though both of the bulbs in the passenger side are acting as high beam, which is why drivers side is turning off completely, with low beam spread across all 4 main bulbs although passenger side low beam is at full level brightness. Yet the two are seperate sections of loom, they dont bridge under the bumper support like they do on other cars. The driver side loom seems to do drivers side headlight, driver side fan switch and both horns, it also has one unused honda type connector set low and one unused single round pin conenctor similar to a HT lead. Passenger does passenger headlight and passenger side fan switch, AC motor and has mirrored one unused honda type connector set low.