Question about 1994 Oldsmobile Eighty Eight

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Transmission will not backup and make a noise in reverse

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If it will not back up, and I am assuming that it is making a grinding/rattling noise in reverse. You most likely have a broken reaction shell, in which case you will need an overhaul, or replacement of the trans. Remove the pan and check for debris, if the reaction shell is broke, you will see pieces of it in the pan.

Posted on Nov 18, 2009

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My reverse lights and my brake lights will not work with the anti theft light on in the dash


These lights are all computer controlled ! Several modules involved DIM - dash integrated module , RIM - rear integrated module .They share information on serial data communication network . Class 2 an or GMLAN !
The rear fuse block supplies battery positive voltage through the REVERSE LAMP fuse to the coil and switch terminals of the reverse lamp relay. The DIM sends a power mode message to the RIM indicating that the ignition is in the ON position. When the driver of an automatic transmission equipped vehicle places the gear selector in the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the RIM. The message indicates that the gear selector lever is in the REVERSE position. When the driver places a manual transmission equipped vehicle in reverse the reverse gear position switch mounted on the transmission closes. This provides a ground for the reverse gear position switch signal line, informing the RIM that the transmission is in reverse. For both automatic and manual transmission vehicles the RIM then grounds the control circuit of the reverse lamp relay . This energizes the reverse lamp relay, closing the switch side contacts and providing battery positive voltage to the backup lamp bulbs. The backup lamps are permanently grounded at G402. With both power and ground the backup lamp bulbs illuminate. Once the driver moves the shift lever out of the reverse position a message is send either by class 2 by the PCM or the reverse gear position switch opens causing the RIM to remove the ground from the reverse lamp relay control circuit. This opens the contacts in the relay turning OFF the backup lamps.
This is something best left to the dealer or a ASE certified repair shop . Need a factory or professional grade scan tool to diagnose an repair this . http://www.public.asu.edu/~pheanis/documents/VBI_CAN.pdf

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1994 Mitsubishi pajero.Where does the reverse light feed come from.To operated reverse alarm.Inside vehicle.Have checked vehicles reverse light switch.This is operating.Either there is another switch.


It comes from the transmission range sensor. When you put the lever in reverse the sensor on the transmission relays this to the backup lights.

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1 Answer

1998 land rover discovery transmission makes loud banging noise when shifting from pari to drive?


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I have volvo 240 with manual transmission and the reverse lights are on all the time


Sounds like the backup light switch is stuck. It is normally installed in the side of the transmission case and is activated by the transmission going into reverse. They can get gummed up over time and fail to release when coming out of reverse.

Dec 12, 2013 | Volvo Cars & Trucks

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Backup lights stay on 1994 gmc sierra 1500 4x4


the reverse switch is stuck on. this switch is in the pan of the transmission. try cleaning the wire connection on the transmission under drivers seat. if this doesn't work I wouldn't pay to fix, I would pull the reverce light fuse or take out the bulbs and if you want reverse lights add some with a different swich on the dash

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1 Answer

1996 dodge caravan backup lights do not work...have checked the fuse and it is fine. How do I get at the lights to check the bulbs? Also there is an awful noise from the engine when started up. The noise...


The reverse light switch is mounted on the transmission (at the front just above the oil pan) most likely has transmission fluid leaking through it and shorting out the switch -- using soap or wd40 will only solve your noise for a short time - remove belt and check your belt tensioner bearing

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1 Answer

My 2001 Blazer will go forward but doesnt go in reverse. Is there a reverse switch on or near the transmission?


Does the gear selector show that is in reverse? Does the transmission have gear selector solenoids on the transmission? If so, may be a bad reverse select solenoid. Do the 'backup' lights come on when reverse is selected?

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1 Answer

My 2004 chysler pt crusier wont backup it make a noise going forward


I'm not sure if you have a manual or automatic transmission. Sometimes the manual transmissions have trouble going into reverse and you need to hold it in while letting out the clutch for it to engage positively. If you have an automatic transmission, check the transmission fluid level and see if it smells burnt or abnormal.

Post a comment with a few more details and we will get back to you.

Thanks,

Tim

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Location of the reverse backup light switch


At left (drivers side) rear of transmission, it should be threaded in, with wires running to it.

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Transmission on 1991 honda accord


If it drives forwards OK with no grinding noise then it is probably cable adjustment.
Unlike forward gears there is no synchronmesh on reverse therefore you need full clutch seperation. Check there is no slack in the cable at all.

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