RE: 2007 DRL - Daytime Running Lights Disabled!
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RE: 2007 DRL - Daytime Running Lights Disabled! - 6/5/2008 6:56:37 AM
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afeudale
Posts: 6
Joined: 2/29/2008
Status: offline
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Good post, but I have some reservations about it...
1) You are tapping straight into the Headlight signal that comes from the ECU. This signal has no fuse and no protection. If you wire something wrong, you will blow your ECU - guaranteed. Say goodbye to $1000... :-(
2) The signal going to the standard automotive relay is still flickering at 65Hz which means the relay will also flicker at 65Hz. This could lead to voltage spikes on the ECU line (Back EMF from the relay coil discharge) killing the ECU, OR premature relay failure from the flickering, OR premature bulb failure due to flicker OR premature ballast failure due to voltage flicker.
Just my 2 cents.
I''ve done quite a bit of investigating on DRL (I wrote the thread on disabling DRL''s for HID linked by rtrackr99 above)
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RE: 2007 DRL - Daytime Running Lights Disabled! - 6/5/2008 8:50:19 AM
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2g0s0r1
Posts: 42
Joined: 1/21/2008
Status: offline
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#1. It has the same protection it already had... no more, no less.
#2. My relay is not flickering, and my steady reading voltmeter confirms the stability across the circuit.
As you stated though... you were researching the HID version.
oh and #3.... everything has been working great for months. I figure if i hadnt disabled the DRLs a while back, i would have already went past the lamplife (actual) of my aftermarket bulbs.
_____________________________
2007 Outlander LS AWD (MoDiFiEd)
Enjoying the ride.....
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RE: 2007 DRL - Daytime Running Lights Disabled! - 6/6/2008 7:34:09 AM
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afeudale
Posts: 6
Joined: 2/29/2008
Status: offline
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2g0s0r1,
On closer inspection of your original photos, I misinterpreted them and thought you were driving the relay from the ECU output. My mistake - so most of what I originally said is moot - i.e. no flickering. However, that said, people should be forewarned that by removing the MOSFET (DRL "Relay"), they are wide open to all sorts of mishaps. There are 4 pins exposed when removing the MOSFET, 2 of them you are using with the relay to drive the headlights, one goes to 12V and the other goes to the ECU (and is an unfused, unprotected pin). If someone were to miswire your setup and utilize that 4th pin instead of the proper 2, they could say bye to their ECU altogether.
So although you did not remove any inherent protection so-to-speak, by removing the MOSFET and leaving the ECU pin open and vulnerable, this does introduce considerable risk...
Good write up though :-)
< Message edited by afeudale -- 6/6/2008 7:56:18 AM >
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