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Install LED Day Running Lights (DRLs) in Fog lights 2009 Volvo V50
Disclaimer: Don't try this if you are not
knowledgeable with electric
circuits or not a qualified auto electrician.
This only applies to cars that have no
DRL switched on by Factory, they can be switched On or Off by
software update at Volvo Dealers.
My aim was to use automatically switched On and Off Day Running
Lights in the Fog Lights without costing so much such as the
aftermarket Volvo supplied package. After studying the
schematics I finally came up with the following system which works
well for me;
Start engine > DRLs ON
(no
other lights are on, front or back)
Stop engine > DRLs OFF after a short delay, when engine
management shuts down
Parking lights On > DRLs OFF
Headlights ON > DRLs OFF
The LED DRLs I use are not suitable as Fog lights, the fog light
switch will be redundant.
Materials required apart from Patience, common sense,
time:
New Change Over Relay. Tyco type V230774A1001A403 12VDC (approx.
US$10)
Multi LED lights, available on Ebay.com
Wiring, terminals, schematics below.
No programming necessary
at the Dealers workshop
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 |
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| Lights
OFF > DRLs ON |
Lights
ON > DRLs OFF |
Wiring |
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 |
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| Remove
Fog light cover |
Replace
bulbs |
Multi
LED DRL lights |
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| Download
Wiring Diagrams |
Schematic
1, page 80 |
Schematic
2, page 88 |
As
you can see most of the wiring is done in the engine bay's fuse box;
Schematic 1: Remove fuse F29 is now redundant. Pull out relay R4 is
now redundant.
Use the new Tyco relay (R4) and wire it as shown in red in both
schematics 1 and 2.
Description:
Power for the LED DRLs (very low current) is coming from the engine
management fuse F33 (Do not use the existing fog light bulbs because
of the much higher current rating)
R4 contact 4 will be connected to the old R4 relay base terminal 5
which is wired to both fog lights. Please use the appropriate
terminals on the wiring
R4 contact (3 and 4) is a normally closed contact (NC) so as soon as
engine management is switched on > power to LEDs.
As soon as parking lights are switched ON and therefore also with
the headlights on, relay R4 will be energised and the contact of R4
opens and DRL LEDs switch OFF.
The relay R4 coil (terminal 1=pos) is connected directly into the
front fog light wire, terminal 7 on the plug, make sure you have the
right wire in the bundle.
The relay R4 coil (terminal 2=neg) is connected to any chassis
terminal nearby.
See also:
Volvo Installation instructions, accessories, Daytime Running Light LED, V50
201
Comments: If
you want to keep the fog lights and install new aftermarket LEDs the
installation is more straightforward;
Description:
You still
need the new Tyco relay or similar with a normally closed (NC) or change over
(CO) contact I have called it R40 in the Schematic:
Do not touch
anything in the Fog light circuits: leave fuse F29 and relay R4 inplace.
Power for the LED DRLs (very low current) is coming from the engine
management fuse F33
R40 contact 4 will be connected to the + of both new LEDs. Please use the appropriate
terminals on the wiring. Neg LEDs will be connected to chassis.
R40 contact (3 and 4) is a normally closed contact (NC) so as soon as
engine management is switched on > power to LEDs.
As soon as parking lights are switched ON and therefore also with
the headlights on, relay R40 will be energised and the contact of R40
opens and DRL LEDs switch OFF.
The relay R4 coil (terminal 1=pos) is connected directly into the
front fog light wire, terminal 7 on the plug, make sure you have the
right wire in the bundle.
The relay R4 coil (terminal 2=neg) is connected to any chassis
terminal nearby.
The best way to wire it all is to run all
LED wiring individually to the fuse box in the engine bay and make all
connection there. The schematic is not a wiring diagram, just a schematic,
wiring will be very easy but check polarity well before testing. Happy wiring
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