DRL_Bypass

DRL Bypass

April 23/2020

Here is one way to disable the DRL's on a 2009 Mazda CX-9 GT.

This method should be considered as "temporary" as it also disables the hi-beams. To keep this inconvenience to a minimum, I put the switch in the
vehicle so the DRL's can easily be turned back on if the hi-beams are needed.

This method is the same as pulling the hi-beam fuse, so you do lose operation of the hi-beams. The switch makes it so you can easily switch the
hi-beam circuit back on, having normal operation of the DRL's and hi-beams.

PARTS USED
PART	QTY	SPECS	SUPPLIER	BRAND	PART #
connector	6	14-16GA /	had in house	Pico	1851BP
connector	1	14-16ga / 1/4" eye	had in house	Pico	1806BP
fuse holder	1	16ga / 20a	Princess Auto	Power Fist	8553380
fuse holder	1	-	Lordco	Pico	9900-11
relay	1	-	had in house	Piaa	LR-18
connector	1	14-16ga / 3 pin	Lordco	Pico	2161-14
enclosure	1	ABS, 80x40x20mm	RP Electronics	Hammond Mfg	1551KBK
shrink tube	7 pieces	3/16"	had in house	-	-
shrink tube	6 pieces	1/4"	had in house	-	-
switch	1	rocker / spdt / on/on	had in house	Wiring Products.com	MRS-SPDT-ONON
wire		black / 16ga	had in house	-	-
wire		red / 16ga	had in house	-	-
wire		blue / 16ga	had in house	-	-

A bunch of parts.

To get the relay as small as possible, I cut off the mounting tab and wiring connector lock tab.

ABS enclosure.

I didn't get an image of the Pico fuse holder or the building process. Moving forward, I cut a hole in the enclosure for the fuse holder and epoxied it in place, then made up the wiring pieces.

Cram it all in there. This is the "control box".

All done the control box.

Wires trimmed to length and connector on.

Tried something new; stuck on a label from the label maker, then sprayed
some clear Plasti Dip over it to protect it and keep it from peeling off.

20a fuse in and ready to go in the car.

New harness done, except for the ground wire which is in the vehicle.

Remove the fuse box and relay box covers.

Control box stuck to the relay box cover.

Hooked up to the fuse box.

To run the ground wire through the firewall, I had to remove the battery to access the rubber grommet.

All done this part.

The ground wire goes to the switch in the dash. Another wire goes from the switch to a nut on the inside of the firewall, just behind the park-brake pedal. Now to make the switch mount.....