compustar clutch bypass, 1995 240sx
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=97308
Printed Date: May 15, 2024 at 6:45 AM
Topic: compustar clutch bypass, 1995 240sx
Posted By: 1995s-14
Subject: compustar clutch bypass, 1995 240sx
Date Posted: September 20, 2007 at 7:24 PM
I have a 1995 240sx manual with a 2w900fm-s compustar alarm. it was installed by some radio shop and they didn't bypass the clutch so when i remote start it, it won't start with out the clutch in. I heard you just take a starter wire from the brain and connect it to the clutch wire? is that correct?
Replies:
Posted By: chadwa2003
Date Posted: September 20, 2007 at 7:43 PM
Hi it depends on if you clutch bypass needs a positive or negative trigger. Why don't you just take it back to them and get them to finish the job. You could probably do it yourself you would a need dmm and some knowledge in the field. The clutch switch you will find all the way at the back of the clutch pedal close to the firewall. It will either go to ground when pressed or will go to 12 volts during crank. If it goes to ground you will need to take the BLACK/ red wire of cn2 from the compustar and attach it to the wire that goes to ground when pressed. If positive you may be able to take the starter output from the compustar and connect it directly to the wire at the clutch switch.
Posted By: 1995s-14
Date Posted: September 20, 2007 at 7:45 PM
ya theres a green and black wire on the back of the clutch switch. How can i test the wires to see weather its pss. or neg.?
Posted By: aggieman2002
Date Posted: September 20, 2007 at 7:48 PM
Need to trigger a relay to bypass the clutch when the remote starter is activated. Take a 12volt relay and connect pin 85 to a fused 12 volt source. Connected pin 86 connected to the ground when running from the remote start brain. At the top of you clutch pedal is a plug that has two wires in it. Pin 86 goes to on if the wires and pin 30 goes to the other wire. This only bypasses the clutch when the remote start is activated.
Posted By: 1995s-14
Date Posted: September 20, 2007 at 7:51 PM
whats pin 85 86, 30? from the brain or is that from a harness or something?...sorry
Posted By: chadwa2003
Date Posted: September 20, 2007 at 8:02 PM
Dont' worry about the realy yet do you have a dmm digital multimeter
Posted By: 1995s-14
Date Posted: September 20, 2007 at 8:05 PM
o those are the pins from the relay on the brain? I have a voltometer will that work?
Posted By: aggieman2002
Date Posted: September 20, 2007 at 8:07 PM
sorry about that, pin 85, 86, 87,87a, and 30 are the pin on a 5 pin 12volt relay. I told you wrong earlier, pin 87 go to one of the wire and pin 30 goes to the other. This doing it this way, does it matter if is pos. or neg, because it just connected the two wires on the clutch together, just like if you press the clutch in. 
Posted By: 1995s-14
Date Posted: September 20, 2007 at 8:17 PM
ya but will that bypass the clutch all together or only when its remote starting?
Posted By: 1995s-14
Date Posted: September 20, 2007 at 8:20 PM
id rather just connect the RED / black wire if i could. how do i test the clutch switch to see if it pos. or neg?
Posted By: chadwa2003
Date Posted: September 20, 2007 at 8:24 PM
Use the voltmeter connect the neg probe to ground and take the red probe and test the two wires at the clutch switch one should be a constant ground and the other should be switched ground when the clutch is pressed. You need to have the meter set to ohms though to test for this
Posted By: 1995s-14
Date Posted: September 20, 2007 at 8:39 PM
the switch wont prie off i cant get the tips behind it. i think ill try the relay
Posted By: chadwa2003
Date Posted: September 20, 2007 at 8:47 PM
Well no matter what we will have to test the wires still if you just strip back a little bit of the i believe you said there was black and green i would test the green but no matter what you are going to have to test before doing your relay
Posted By: 1995s-14
Date Posted: September 20, 2007 at 8:52 PM
so whats will be the situation just connect the RED / black wire to a wire? i looked at my relay and 87 pin doesn't even have a blade or wire on it.
Posted By: 1995s-14
Date Posted: September 20, 2007 at 9:07 PM
shouldn't the black be a constant ground?
Posted By: chadwa2003
Date Posted: September 20, 2007 at 9:13 PM
Thats not always true test with a multimeter if the wire goes to ground when you push the clutch in then you can connect the RED / black wire to that wire
Posted By: KarTuneMan
Date Posted: September 20, 2007 at 9:46 PM
Use an aux start output from the unit to power a relay to send a NEGATIVE start to the GREEN / WHITE at the clutch switch. connect. 2 pin 5 I believe. Wire a relay to "throw" ground. using this negative trigger. Clutch is now bypassed. -------------
Posted By: profuse007
Date Posted: September 20, 2007 at 9:58 PM
Grn/white is low current input to a relay coil.
use 2nd starter wire or soemthing to trigger it. I believe compustar has a wire like that.
-------------
Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).
Posted By: chadwa2003
Date Posted: September 20, 2007 at 10:30 PM
Just use the RED / black coming off cn2 on the compustar negative starter output that will be fine to bypass the clutch
Posted By: KarTuneMan
Date Posted: September 20, 2007 at 11:24 PM
so I guess my plan is silly..... use a relay to trigger a relay....hmmm. -------------
Posted By: profuse007
Date Posted: September 20, 2007 at 11:38 PM
^if you dont know for sure always use a relay. be safe than sorry.
I just looked up the starter diagram.
-------------
Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).
Posted By: 1995s-14
Date Posted: September 21, 2007 at 12:13 AM
i spliced the green wire and tested it and when the switch was in it ground. i hooked the BLACK/ red wire to it and it still wont start unless i have the clutch in
Posted By: dea,can
Date Posted: September 21, 2007 at 2:09 AM
With out the pedal pressed: test the wire with the Ignition OFF test the wire with the Ignition ON test the wire with the key in the start position With the pedal pressed; test the wire with the Ignition OFF test the wire with the Ignition ON test the wire with the key in the start postition With this information for every wire at the switch, determining what type of the clutch switching system you have will be easy ------------- dragon
Posted By: 1995s-14
Date Posted: September 21, 2007 at 6:21 AM
i really dont understand
Posted By: moonliter
Date Posted: September 21, 2007 at 3:52 PM
just wandering, does your 240sx has a cruise control in it ? if it does, there should be another set of switch at the clutch then check the correct wire there
Posted By: 1995s-14
Date Posted: September 21, 2007 at 4:57 PM
it has crusie control. i connected the same wire i connected to the GREEN / WHITE wire on the switch to the upper clutch switch i tried both and they both didn't seem to be ground so i connected it anyway and tried it and now the clutch is bypassed all the time. not just when i remote start it like its supposed to. any ideas.
Posted By: moonliter
Date Posted: September 21, 2007 at 6:19 PM
the GREEN / WHITE should be tested ground when the clutch pedal is depressed only If it is, then connect the (-) RED / black from cn2 to the GREEN / WHITE at the clutch switch and no way else
Posted By: 1995s-14
Date Posted: September 21, 2007 at 6:44 PM
my clutch has two switches. one at the top that senses the clutch not pressed in and one on the floor where you have to hold the clutch all the way down. to start it th top switch must be released and the floor switch must be engaged.
Posted By: moonliter
Date Posted: September 21, 2007 at 7:15 PM
yes, one is for your cruise control, the other is for the starter. from what you described, i believe the one on the floor is for the starter. the GREEN / WHITE wire should be on it. like i said, only use the (-) RED / black from cn2, connect it to the GREEN / WHITE on the bottom switch do not run n connect any wire from the top to the bottom switch. otherwise you might get a backfeed and cause the clutch bypassed all the time
Posted By: 1995s-14
Date Posted: September 21, 2007 at 10:59 PM
I connected it to just the floor switch and it didn't work.
Posted By: dea,can
Date Posted: September 22, 2007 at 3:36 AM
https://www.the12volt.com/installbay/forum_posts.asp?tid=70817&KW=clutch+bypass read my post or send me your e-mail and i will send you how to wire that switch in. ------------- dragon
Posted By: profuse007
Date Posted: September 22, 2007 at 9:17 AM
those nissans have clutch wire located b4 the clutch or at the top. The switch is Normally Open(NO) to ground.
The bottom switch is NC and it is for cruise control.
-------------
Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).
Posted By: dswift
Date Posted: September 24, 2007 at 12:01 AM
you get this to work yet dude? ------------- "dont ground out!"
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