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Old 22nd January 2020, 17:53   #1
planenut
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Default Side Light Fault

Sorry all, this is a bit lower league, my nearside front side light appeared not to be working and the fault was highlighted by the fault light on the dash.

Eventually, I got the bulb out though it looked okay, and I replaced it with a new bulb, this did not work either. It's one bulb, so I wasn't looking for a fuse fault.

Tried both the bulbs linked but out of the socket, but neither would illuminate. The terminals are clean and not corroded.

I realize that this will lead to the bumper coming off, but are there any suggestions as to the route of the wiring please and possible connections?
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Old 22nd January 2020, 19:49   #2
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I realize that this will lead to the bumper coming off, but are there any suggestions as to the route of the wiring please and possible connections?
Bumper off is the only way to verify whether it's due to the common problem of harness chafing.
A severe case:


The nearside harness crosses the sharp welded seam. Vibration does the rest.

This typically causes issues with the nearside headlamp system. The hot spot is forward of the screen wash reservoir.

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Old 24th January 2020, 17:11   #3
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sadly, having taken the bumper surround off, so that I could check the wiring; taken out the air filter and hoses, I could not find any chafing (that's not a swear word, though I was using them) evidence. Due to the wiring differential, I might as well be colourblind.

The internal wires to the bulb are only red and black. The wiring coming in to the multiplug is of many colour combinations. Logically, those coming in serve different purposes.

All fuses and relays in the engine bay fuse box are okay, though I never imagined that one would only serve one light bulb.

I really cannot imagine a dodgy wire being anywhere but from the light unit to the loom. The wiriing diagrams that i've found vary, and don't exactly let me pin down one wire.

Covered it all up and will have another go tomorrow.
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Old 24th January 2020, 17:41   #4
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sadly, having taken the bumper surround off, so that I could check the wiring; taken out the air filter and hoses, I could not find any chafing (that's not a swear word, though I was using them) evidence. Due to the wiring differential, I might as well be colourblind.



The internal wires to the bulb are only red and black. The wiring coming in to the multiplug is of many colour combinations. Logically, those coming in serve different purposes.



All fuses and relays in the engine bay fuse box are okay, though I never imagined that one would only serve one light bulb.



I really cannot imagine a dodgy wire being anywhere but from the light unit to the loom. The wiriing diagrams that i've found vary, and don't exactly let me pin down one wire.



Covered it all up and will have another go tomorrow.
The damaged wiring pictured above was actually hidden below the headlamp, only being apparent when the lamp unit was removed.

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Old 24th January 2020, 17:55   #5
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The damaged wiring pictured above was actually hidden below the headlamp, only being apparent when the lamp unit was removed.

Sent from my SM-A600FN using Tapatalk
Thanks, the wiring comes in from the loom to a multiplug fitted behind the headlight unit. The wiring that drops below on mine goes to fog lights.

I will keep searching, but am having trouble with diagrams.
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Old 24th January 2020, 18:31   #6
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Thanks, the wiring comes in from the loom to a multiplug fitted behind the headlight unit. The wiring that drops below on mine goes to fog lights.

I will keep searching, but am having trouble with diagrams.
Fred, it may be stating the obvious, but have you checked the bulb for a break in the little wire connector?
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Old 24th January 2020, 18:35   #7
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Fred, it may be stating the obvious, but have you checked the bulb for a break in the little wire connector?
Thanks, yes, I was hopeful again that it was both bulbs but no, they're fine.
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Old 24th January 2020, 19:02   #8
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sadly, having taken the bumper surround off, so that I could check the wiring; taken out the air filter and hoses, I could not find any chafing
That's the nearside wing area. Have you checked the harness by the screenwash reservoir?


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Old 24th January 2020, 21:09   #9
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Thanks, yes, I was hopeful again that it was both bulbs but no, they're fine.
My car had a similar problem quite a few years ago now. It turned out to be slightly corroded connectors in the plug on the light switch module.

Easy to get out and check. I sprayed the pins in the socket with WD 40 and it's worked perfectly ever since.---
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Old 24th January 2020, 23:18   #10
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My car had a similar problem quite a few years ago now. It turned out to be slightly corroded connectors in the plug on the light switch module.

Easy to get out and check. I sprayed the pins in the socket with WD 40 and it's worked perfectly ever since.---
Thanks, I'll check that out tomorrow. I hadn't been to the switch yet.
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