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Clutch Safety Switch-Cleaning & Adjust

Old 01-25-2011, 04:12 PM
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shiftdrift06
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Default Clutch Safety Switch-Cleaning & Adjust

The Clutch Safety Switch, is a safety feature to ensure a vehicle does not start unless the Clutch is push in. It helps prevent a vehicle from be starting and jumping forward, if the vehicle is in gear with the clutch out.

A bad Clutch Safety Switch can cause intermittent starting trouble. It is a very simple switch, and usually a cleaning and adjusting cures this problem.

*Symptoms usually includes turning the ignition but the engine DOES NOT TURN OVER. However, you have full power, battery, etc..

* You usually have to do a push the Clutch Pedal a couple times while turning the ignition in order to get the engine cranking.

**THIS SHOULD NOT BE CONFUSED WITH A BAD/INTERFERENCE with your transponder KEY. This is where, you turn the ignition, and the engine cranks over fine, but wont fire up. For that, try removing the key, and cleaning it.**

You will need the following items.
14mm wrench
Electronic cleaner or Rubbing Alcohol & Q-tips
Small flat-head or knife


1.) Start by locating the Safety Switch, it is located behind the clutch pedal. The one in-front of is the Cruise Control Switch for future reference.

2.) Disconnect the connection to the switch.

3.) Use a 14mm wrench to loosen the Lock Nut, behind the safety switch bracket. When it is loosen, you can rotate and back out the WHOLE switch.


4.) The switch has 2 little clips on each side, insert a small flat-head or knife, and gently pry it open. BE CAREFUL, it breaks very easy!!


5.) It opens up into 2 main pieces, and inside you will see the 4 contacts points in the switch. Clean the 4 points with electronic cleaner or rubbing alcohol.

6.)Now, make sure the 4 contact points, are lined up with each other. If they are misaligned and not touching, the switch will not work. You can bend the little ends very easily.

7.) Once done, reinstall the switch back in place. But do not tighten the switch back in we need to adjust it first! Make sure to clean the connector also.

*Adjusting the SWITCH*

8.) With the switch back in place, press the clutch pedal all the way down. Make sure the clutch pedal, is fully pushing in the Safety Clutch Switch. Once satisfied, tighten the 14mm locking nut, and your done!
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Old 04-21-2011, 05:52 AM
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I love you
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Old 10-21-2011, 04:53 PM
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This is great information, but I'm having a really difficult time performing step 2 and disconnecting the switch. I'm trying to be careful and not forceful with the clips, but I have about 2 square inches of space to work with and can't see much. Can you provide any pictures or description of how to perform this step?

Thanks!
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Old 10-21-2011, 05:33 PM
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shiftdrift06
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Originally Posted by beamer7296 View Post
This is great information, but I'm having a really difficult time performing step 2 and disconnecting the switch. I'm trying to be careful and not forceful with the clips, but I have about 2 square inches of space to work with and can't see much. Can you provide any pictures or description of how to perform this step?

Thanks!
Yeah its a very tight space. Make sure you have the seat all the way back and steering wheel adjusted up. Kinda have to lay on my back and look up at it.

But it should come out. The connector has a release you have to pinch together before you can pull it out if I remember correctly. Ill go check in a second.
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Old 03-27-2012, 01:06 PM
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zigggy56
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I know this is an old POST, but +1 on the I LOVE YOU MAN.

didn't bother to clean the switch, but bought the replacement from Rockauto.com for $16 shipped, ordered on Friday, got here on tuesday. took out the old switch and replaced with new and the car start 10 out of 10 times instead of 1 out 10 times. I can now trust my baby again.

For anyone that has this problem in the future, the only thing this post was missing was the simple instruction to pinch the blue clip on the wire harness so it slides out easily. and the other instruction of turn the wrench clockwise to loosen

part number from Rockauto - 1S5768
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Old 05-10-2013, 01:55 PM
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Z33Garage
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I know old post but anyone know the color of the wires for this switch? There are 2 connectors and I seem to have unhooked both and forgot which one is which....

I know I fail at life...
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Old 06-22-2013, 02:23 PM
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+1 it's an old post but extremely helpful nonetheless.

I recently started having the same issues, car starting only after pushing the clutch 2-3 times. Then it became 7-10 times before my Z started... I took it to the shop and 2 mechanics agreed that it was a bad starter.

Thank God for this forum as I began researching on here and came across the clutch safety switch. I replaced it yesterday and my Z starts on the first time every time! Saved myself $300!

Last edited by E.Rod84; 06-22-2013 at 02:24 PM.
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Old 08-18-2013, 08:41 PM
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Glad you guys got it working. The clutch safety switch is common in majority of manual transmission vehicle. So this concept applies to other cars as well if you having a hard time starting.

If you guys need additional help or pics. Drop me a PM. I know thread is abit outdated now.
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Old 05-25-2015, 02:54 PM
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Glad this thread is still up! I just fixed the switch on my G37.

When I pulled the switch apart there was no spring force pressing the contacts together. I pulled one of the contacts out then bent the other one towards the center of the switch a bit. Then I pulled that one out, put the other in and did the same thing. The contacts looked clean, but wiped them with alcohol anyway. Starts every time now, thanks!
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Old 04-14-2018, 10:08 AM
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Originally Posted by beamer7296 View Post
This is great information, but I'm having a really difficult time performing step 2 and disconnecting the switch. I'm trying to be careful and not forceful with the clips, but I have about 2 square inches of space to work with and can't see much. Can you provide any pictures or description of how to perform this step?

Thanks!
Had the same issue. Did not understand how the switch worked. Looking at it from the side gives a better idea of what you need to depress - the entire exposed blue rectangle.


Depress the ENTIRE blue bar/rectangle that runs across the switch


Depress the ENTIRE blue bar/rectangle that runs across the switch
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