Light Behind Me
Among the many things not working when I bought my Cherokee, I’d have to say that fixing the backup lights was one of the hardest ones to figure out and yet, ultimately the easiest one to fix. The funny thing about it is, there’s actually tons of good information online regarding how to address this issue. That is, if you have an AW4 Automatic. And yes, you guessed it, I just happen to have an AX-15 5-Speed Manual.
Now, if you’ve stumbled across this post, have a backup light problem and you have an AW4, let me save yourself some time and tell you to just do a search for “Jeep Cherokee (or XJ) and “NSS” or “Neutral Safety Switch”. Trust me, you will find what you’re looking for there. If you have a 5-Speed like me, you will not have an NSS and should therefore continue reading below.
Okay, so why was figuring out how to fix my backup lights such a problem for me? Well, after going through the obvious like checking the fuses and bulbs (which both came up clean), I started looking for any loose connections in the wiring harness and was convinced that the problem would be there. After all, the previous owner did tell me that he did just have a trailer hitch and wiring harness for it installed. But, much to my surprise, everything checked out there too. With that, I had concluded that the problem must be with the Backup Light Switch. What else could it be, right?
Well, after doing some calling around, I found that a Backup Light Switch for an AX-15 (Part# - WELLS CR413) only costs about $60 at Autozone (as opposed to a NSS for an AW4 that can set you back about $200) and so I was feeling pretty lucky that this fix wasn’t gonna hurt the wallet too much. Anyway, with a new Backup Light Switch and a 1-1/16″ wrench in hand, I crawled under my Cherokee, removed the existing switch from the passenger side of the transmission and installed the new one. I climbed back out, turned the key to the on position, shifted the transmission to reverse, took a look at my tail lights and saw… nothing!!
What the hell - what did I miss? Was it a fuse I was unaware of? A short in the wiring somewhere? Oh God I thought, I sure hope to hell it isn’t that. There are few things I hate more than having to track down a short. Fortunately for me, my wife saw how frustrated I was and decided to some research of her own and suggested that I check to see if the switch was installed all the way on and/or if it might need to be adjusted. Okay I thought, now there’s something I hadn’t checked yet, is the damn switch even showing any resistance when activated? With my multitester in hand, I climbed back under my Cherokee, unplugged the Backup Light Switch from the wiring harness, had my wife put the transmission into reverse and then checked the switch for resistance and… nothing. Imagine that? Just for good measure, I grabbed a hold of the old switch, activated it by hand, checked for resistance and… there it was - the old switch actually worked. Need I say, it was at about this point that I could start to see the light at the end of the tunnel.
What I decided to do from here was pull the new Backup Light Switch off, reinstall the old switch, checked for resistance but still got nothing. Then, I decided to tighten it down a bit more - quite a bit more so that it was on really tight now. Checked resistance again and… there it was!! So, I quickly plugged it back into the wiring harness, climbed back out from under my Cherokee, checked to see if my backup lights were on and… YES!! They were finally on and I now had light behind me!!
So what did I learn from all this? Number one, check everything thoroughly and then thoroughly again before you spend any money and when in doubt, ask my wife for help. She is after all, the best troubleshooter of just about anything that I know.