No Backup lights

Hi, Have perused the postings here , but still no backup lights in 94 CGC limited , 6 cyl, 4.0 auto ,4x4.........Per the postings here , have replaced the neutral switch on the trans , checked the bulbs , pulled/reinstalled all the fuses , disconected the battery for a period of time to reset the computer , used the key in all door locks to cycle them...still no lights .....

I am second owner of the car , had the dealer do the recall repairs , shift interlock, etc...had a trailer hitch installed , but the wireing dosnt connect to the green/brown wires of the backup lights ,all other lights work...I suspect the shift interlock is not adjusted properly, but looking under the center console, do not see anything to adjust , any suggestions appreciated

Presuming that the NSS that was installed was functional and the wiring to it is correct, try this -

Have someone stand in the rear of the car. Start the car. Put your foot firmly on the brake and slowly move the gear selector from park to drive. If the person at the rear of the vehicle sees the BU lights flash move it again until they come on and stop moving the shifter. Note the position of the shifter an then adjust the shift linkage under the vehicle so the lights come n in the reverse position. :2cents:

Thanks for your suggestion,will try it , need to look in the book for the adjuster point under the car .....did note at one time the BU lights did flash while wiggling the shifter at one time , now they dont even flash, so it must be way out of adjustment, hopefully that s the cure .........

did note at one time the BU lights did flash while wiggling the shifter at one time

This happened before replacing the old NSS? If so I would take it as a good sign, because it would suggest the wiring to the lights is intact. If you saw it after replacing it maybe the new switch is bad.

The vehicle starts ok? Because the park neutral safety business is in that switch too.

1964Avanti was right, the shift cable is out of adjustment,by about an eight of an inch, the reverse lights come on if I push the shift lever forward to the reverse detent....I do not have the confidence or ability to adjust it ,as I may do more damage than good , so I guess it s off to the dealership..will wait for my colorado trip , the dealers there are more honourable and glad to help..thanks for your replies

I am having the same problem,my shift lever need to be pulled slightly to the neutral position for the lights to come on. Chilton manual indicates no adjustment for the switch so must have to adjust shift linkage? Will attempt to do this myself before bowing down to the dealer though, will not give up that easily.Any recommendations will be listened to with open ears; even the one telling me better leave it alone. Thanks for all the help guys; the site is the bomb.

The symtoms described above are a sign that the NSS is bad. It is not making good contact. The switch works by having a very small follower ride on a cam within the transmission. The switch motion is very small.

I examed ways of adjusting the linkage also and there is not possible way to do it.

My suggestion is save time and replace the NSS.

Thanks for your quick response 1964 avanti, after posting I searched the forum and found other threads that led me in that direction but always reassuring to get second and third opions. Found others that have solved this problem with replacement and will replace as recommended. Seems as though there are two different transmissions. Some discribe theres as being an AW4; I assume this is all-wheel drive?

No the very first half of 1993 when the Grand was introduced a transmission was used known as the AW4. Halfway through they switched to another, the 42RE.

http://www.jeeptech.com/trans/aw4.html

You'll need to know what you got under there. Search here on the board on how to request your build sheet from Chrysler using your VIN. They will tell you what the vehicle was built with.

The NSS is a fairly easy replacement, the suck part is if it's corroded onto the shaft coming out of the tranny and you have to sawzall the thing to pieces.

You can be sure before you go after the old one. Follow the pigtail up on the right side of the motor near the oil filter (Inline 6). Just plug your new one in and move the switch to see if the BU lights go on.

Regular auto parts stores want $250 for the one that fits my vehicle. I saved a pile getting it on Ebay and it was the exact same brand.

No the very first half of 1993 when the Grand was introduced a transmission was used known as the AW4. Halfway through they switched to another, the 42RE.

http://www.jeeptech.com/trans/aw4.html

You'll need to know what you got under there. Search here on the board on how to request your build sheet from Chrysler using your VIN. They will tell you what the vehicle was built with.

The NSS is a fairly easy replacement, the suck part is if it's corroded onto the shaft coming out of the tranny and you have to sawzall the thing to pieces.

You can be sure before you go after the old one. Follow the pigtail up on the right side of the motor near the oil filter (Inline 6). Just plug your new one in and move the switch to see if the BU lights go on.

Regular auto parts stores want $250 for the one that fits my vehicle. I saved a pile getting it on Ebay and it was the exact same brand.

Above is true if you didn't win the lottery and don't have the NSS that is on the left side of the transmission. That is the one I have and is easy to replace using a 1 inch socket. This NSS costs $24 at the jeep dealer. Use the jeep part as it fits the electrical connector without a hassel.

After some research, found I have the 42re used in all 98 grands. I have no reverse lights unless I pull back slightly on the shifter while in reverse. Some say this sounds like a linkage adjustment; some say this is a sign of the NNS gone bad.1964avanti said there was no adjustment.