Daytime Running Lights (DRLs) for the 2010 UK Honda Jazz - Civinfo
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post #1 of 9 (permalink) Old 4th August 2012, 13:00 Thread Starter
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Daytime Running Lights (DRLs) for the 2010 UK Honda Jazz

OK, so I've done one final mod for now... I thought I'd add DRLs to make it look a bit "fresher".

Before I start, I've seen many "odd" implementations of DRLs around the web, so I thought I'd start off by clarifying that UK and EU law state there are only 2 allowable methods of implementing DRLs.

1) They turn ON with ignition and turn OFF when the sidelights/headlights turn on
2) They turn ON with ignition and DIM to more than 50% when sidelights/headlights turn on

They should NOT be separately controllable (i.e. no wierd and wonderful switches in the cabin which other countries may allow).
They should either be OFF or 50% dim with the main lights (so we're not allowed to keep them at the same intensity when the sidelights or main beam turn on)
They should be electrically separate to the fog lights (because the fog lights are "cabin controllable" whereas DRLs are not allowed to be) - so no splicing into the existing foglight wiring either.

A variation on 2) is what Audi do where, along with dimming, they alternate amber blinking with the indicator lights as well - in effect doubling as "extra indicators".

Anyway, I decided to do the "standard" type 1) DRL's which turn off when the sidelights or mainlights come on, and I simply used the shroud for the foglights to physically house them in so that they look more OEM and less like I've gone to Halfraud's with some birthday vouchers .

So here are the DRLs I bought from eBay for about 14 total, along with the relay needed to make them work for 8:

...and here they are close up:

They're 1.5W long throw LEDs sealed into a screw and bolt, for easy mounting.

I got them as I thought they'd look good and more OEM in the plastic shroud around the foglight:

The plastic shroud has a screw in the bottom hole holding it on and two on the side so it's easy to remove without disturbing the foglight itself or it's wiring:

Notice the two upper holes are simply blind ending (presumably there to make it look nicer).so I thought I could house the LED's into them. I drilled through them (easy as it's plastic) and then bolted in the leds which secured nicely from behind and came sealed/waterproof so no worries about getting surface water in there:

I then routed the wiring up to the bonnet area and soldered the 4 LEDs in parallel. These were then connected to the appropriate leads on the relay. Here is the wiring diagram for how to wire them up:

Remember to tie wrap to existing wiring cables (so the DRL ones are routed away from hot parts of the engine).

The LEDs have a narrow beam which is important because they need to be bright head on so that people crossing down the road can easily see you in daylight, but rapidly dim off axis so that you don't blind other road users.
You see this trait with OEM ones (e.g. Audi), where they're bright when far down the road and you're looking at them more "on-axis" but rapidly dim as they pass you. This is why specific spot LEDs are better than standard strip lights off of ebay imho as those spread the light more and therefore look good as "styling lights" but no good as "daytime running lights".

So apart from the +ve and -ve of the LEDs, the relay was ground to the chassis, and the signal wire (that turns the LEDs off) was tapped off of the sidelight +ve feed. The trickiest part was finding an IGN+ feed to power the LEDs. The fusebox is in the cabin (there is none under the bonnet) so I had to route it into the passenger side of the cabin running along with the sub positive wire through an existing grommet.
I then routed back across to the drivers side to the fusebox and ended up splicing it with my alarm LED which is protected by a fuse and is IGN+. I used a 5A amp fuse for protection (they're only LEDs) and I strongly suggest if you route the power lead to elsewhere other than the fusebox, to protect it with an inline fuse instead.

Anyway, so here it is all done, looking fairly OEM from a few paces away:

...and here it is with them on...nice and bright for daytime use:

They turn on with ignition and off with sidelights/headlights for a total cost of 22 and look a bit more OEM than most off-the-shelf stuff imo.
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post #2 of 9 (permalink) Old 4th August 2012, 13:32
Type EX,A guy called Mark
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Nice work.

Do you have a ebay link or item number?.
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post #3 of 9 (permalink) Old 4th August 2012, 16:40
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very nice mate
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post #4 of 9 (permalink) Old 4th August 2012, 20:00 Thread Starter
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Thanks guys .

Yep, the items are:
DRLR1 relay from gl-automotion.
They also sell the other type of relay that dim the DRLs instead to 50% plus the ones that allow them to act as an indicator (provided you have the correct type LEDs)

The LEDs are from automore2011 and are sold in pairs.
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post #5 of 9 (permalink) Old 4th August 2012, 22:01
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Great job mate...
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post #6 of 9 (permalink) Old 11th August 2012, 19:15
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Excellent write up and a job well done.
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post #7 of 9 (permalink) Old 30th October 2012, 15:58
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Originally Posted by Gaffer View Post
Thanks guys .

Yep, the items are:
DRLR1 relay from gl-automotion.
which one?
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post #8 of 9 (permalink) Old 30th October 2012, 16:01
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Originally Posted by s33s View Post
which one?
The DRLR1 isn't listed - drop them an email.

The guys there are helpful - I had a conversation with them about linking a DRLR1 and a DRLR3 plus we drew up some additional circuitry to do what I needed - but I still can't find any LEDs that look good to me.
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post #9 of 9 (permalink) Old 6th November 2012, 12:32 Thread Starter
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Yep, they do DRLR1 (drl only on with ignition), DRLR2 (as above but dim with lights not just shut off), and DRLR3 which is as 2 but also works as indicators provided you have the correct type of DRLs.

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