Prelude Headlight Woes
Discussion
My car came with some rather tacky aftermarket angel eye headleads. These seemed to have an issue with them, I did bits of continuity testing on the wiring to check it wasn't that and ordered some 2nd hand OE units.
Today I fitted them and i'm getting the same issue as before. This time I volt tested too and somethings up:
Dipped beam = Drivers side - Dipped beam bulb ON, half brightness. Gives 12v earthed to body
- Full beam bulb ON, half brightness, Shows 0 volts at connection to bulb holder
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 at connection to bulb holder
- Full beam bulb OFF, Shows 0 volts at connection to bulb holder
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, 2 of the 4 connections show continuity across pins (passenger side) and continuity from power pin to earthing bolt on the wing for either side (both), but drivers side only shows continuity earthed to body, not across the power supply pins.
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.
Low beam however is 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 the drivers side for position of one unused honda type connector set low.
Today I fitted them and i'm getting the same issue as before. This time I volt tested too and somethings up:
Dipped beam = Drivers side - Dipped beam bulb ON, half brightness. Gives 12v earthed to body
- Full beam bulb ON, half brightness, Shows 0 volts at connection to bulb holder
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 at connection to bulb holder
- Full beam bulb OFF, Shows 0 volts at connection to bulb holder
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, 2 of the 4 connections show continuity across pins (passenger side) and continuity from power pin to earthing bolt on the wing for either side (both), but drivers side only shows continuity earthed to body, not across the power supply pins.
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.
Low beam however is 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 the drivers side for position of one unused honda type connector set low.
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