Datsun78

'00 stock XJ. I am considering installing a kill switch in the ASD relay wiring using an OEM fog light switch. A few questions:

1) Does it matter which ASD wire I install the switch into?

2) Will this wiring keep the preset radio/clock settings when off?

3) Will the OEM fog light switch handle the electrical load in the ASD wiring?

Thanks!

Mark

Saudade

Depends whether you prefer the B+ side or ground side. The fused sides of the ASD are Fuse 11 in the junction block (20a). and Fuse 8 in the PDC (30a). I'm not sure how much current the fog lamp switch will carry but I would not put it on the load side of the relay (30a)

The fog lamp switch is wired into the B+ coil side of the fog relay but is protected by a 10a fuse (#7)

Pin D4 on the ASD relay comes from Fuse 11 (20a). So that would be the B+ side. Pin D6 is the ground side and goes to the PCM.

If on the B+ side, the "ON" indicator would still work so you have that to verify it's "ON". Not sure if the indicator can work if the switch is on the ground side. Not sure you really need the indicator as the switch's position would tell you it's on.

awg

I was personally thinking of using the fuel pump wiring under the vehicle, for 2 reasons

1) I can easily cut and spice a wire and run it up near the driver seat, I may have to make a small watertight hole in the floor

2) I want external daytime driving LEDs that only alight with the engine running, I can get the trigger from the fuel pump

Datsun78

I need help getting this OEM fog light switch to act as a kill switch. (My '00 XJ does not have OEM fog lights). I connected the switch's light blue and violet wires to interrupt the ASD blue/white ground wire at the fuse box; vehicle does not start with switch in off or on position. My Haynes manual does not indicate what the switch's black and orange wires do. Can anyone offer any advice? Thanks!

bluejeep2001

The purpose of a relay is so you can send lots of power through the primary power contacts...pins B6 and B7 in the fog light relay...but it takes minimal power to control it through the coil / energizing contacts pins B10 and B8...I used that relay as an example because it was there. They ALL work the same. You can energize the cooling fan relay with less than an amp but it sends 30 or 40 amps to the fan.. It does not matter which side of the control circuit you want to interrupt with your switch, control power in or coil ground out...it needs both to function. If you interrupt the power to the coil, then you have to bring the power in to your switch and send it back out to the ASD relay..if you interrupt the ground you only need the ground from the ASD coil thru your switch and any good ground in the dash will work for you..hope that helps

awg

You should always use a multimeter and/or test light and 12V to make sure you understand what the wires on any switch or relay you install is doing.
That is the sure and certain way. Write it down on a piece of paper till you understand. Hooking up a switch wrong can cause bad things

bluejeep2001

I did not read all of your text so i jumped the gun. I was up in the attic tonight and found my fog light switch on a shelf. Since the wires on your switch block the text detailing the lower wire on the print i have to go by your description. The violet wire is the input wire, and the light blue is the out wire. Between them they are open when the top of the switch is depressed (off) and they show continuity when the switch is pressed down (on). The other two show resistance ( low) to either the violet or light blue depending on switch position even though not shown in your print. The black and orange should be capped off separately...what did you do with yours. 2 ndly where did you tap off your ASD wires and exaxtly how did you connect to the switch. If you don't have fog lights, there should be no fog light relay, thus all your circutry dead ends at the relay port. Need a few more prints detailing exactly where you tied it all together for me to help

Datsun78

bluejeep2001:

I extended the switches' light blue and violet wires and connected them to the blue/white ASD ground wire I cut below the fuse box. Does it matter which side of the ASD wire I connected the light blue and violet switch wires to? I capped the switches' black and orange wires. Is that enough info? Would it be better to cut one of the other ASD wires to connect my switch to? Thanks for the help!

Mark

bluejeep2001

I will check the prints tomorrow to see whats up with the ASD wires you spliced into..when you say capped the black and orange...they were capped separately i hope and not twisted together and capped. So if i get you, you only used the fog light switch, lt blue and violet wires and did not tie into any of the fog light circutry

Datsun78

bluejeep2001,

Correct on all your inquiries.

Mark

bluejeep2001

I will check the asd wiring print tomorrow...did you ever put a multimeter on the lt blue and violet wires to confirm an open when off and continuity(very low) resistance when switch selected..you just might have a bad switch

bluejeep2001

If you care...the black wire gets grounded...power from your headlight switch into the orange illuminates the fog light symbol. If you also send power into the violet wire, and you turn on the switch, the glowy green "ON" light illuminates, at the same time it sends the feed voltage out the lt blue wire to power your fog lights. You can power the orange wire and black ground to illuminate the fog light symbol if you want but if you are sending the ASD ground down the violet, you will never get the green to light. Do not do this yet even if you want to, i cant confirm the input orange voltage won't backfeed into the violet/ lt blue. Thats because you are sending a ground down the violet/lt blue and NOT the input voltage it was intended for. For now keep the orange and black separated and capped

Veeb0rg

Orange and black are for illumination of the switch. Black is ground, Orange is 12v.

edit whoops beaten

bluejeep2001

per sht 8w-30-2 if you cut the db/wt wire and hooked them up directly to your violet and lt blue wire it should work. Make sure you have continuity through that switch from your extensions when the switch is on. also make sure you did not blow fuse 11 (20) amp in the rt footwell junction block. dark blue/white is the coil in power to the relay and dark blue/yellow is the coil ground side. Either set of wires will perform your function. make sure you do have bl/wt in and out of switch or bl/y in and out

Datsun78

bluejeep2001,

Success! Turns out my original fog light switch was bad. I replaced it after verifying it worked, capped the unused wires, verified light blue and violet switch wires were connected to the appropriate ends of my cut into the blue/white ground wire. Now works as desired. Thanks for your help! Your suggestions pointed me where I needed to focus. I couldn't get the green indicator lamp or fog light symbol to work(they may be burned out), but that is a minor inconvenience. It is doing what I want the switch to do, and offer some theft security. Thanks again!

Mark