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Old 02-27-2018, 09:58 AM   #1
wtfisafleek
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Can't move transmission out of park

This is for a '91 LX.

So I noticed an issue with my car immediately after I got it back on the road back in December where the "S" light would stay on after I switched out of park. Pressing the button on the side of the shifter had no effect; so the Sport mode was useless at that point. Other than that the car ran and shifted fine. I couldn't leave well enough alone since it bugs me when things don't work as they should on my cars so I wanted to fix it.

I got advice here that either my TCU had an issue, or it was replaced with a later model TCU that wasn't designed with the "S" functionality.

I got a hold of a correct TCU for my year car and swapped it in, however now the car wouldn't shift out of park. I figured no big deal, this one's probably got a bad component that needs to be resoldered. After I swapped my original back in, the car still won't shift out of park.

Any idea what might be going on? I did make sure to disconnect the battery before doing any of this.
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My '91 LX build. Bought September 2017.
http://www.cb7tuner.com/vbb/showthread.php?t=209871

Last edited by wtfisafleek; 02-27-2018 at 12:44 PM.
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Old 02-28-2018, 01:20 AM   #2
Zombine
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Checked your brake lights are working? Park lock normally activates from the brake pedal position switch
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Old 02-28-2018, 05:05 PM   #3
wtfisafleek
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After reading a bit on the internet I did come across that being a problem, so I checked a minute ago to see if I hear that click which I do remember having heard before. I am not hearing it now when I put my foot on the brake.

It doesn't follow that the park lock would be the problem since it wasn't before I swapped the TCUs. BUT, what if my problem ECU blew a fuse to this particular switch/solenoid? That could be possible I guess. I'm going to check the fuses after it stops raining.
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http://www.cb7tuner.com/vbb/showthread.php?t=209871
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Old 02-28-2018, 05:29 PM   #4
wtfisafleek
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I wasn't sure which fuse the shift lock is so I visually inspected all of the fuses on the driver's kick panel; they are all good. Is it actually one of the fuses underhood? Because I checked the descriptions on the lid and they don't lead me to believe it lies there.

I checked to see if the brake lights are operating correctly and they are.

There are no trouble codes when I jump the blue connector on the passenger kick panel.

I wonder if the bad TCU somehow damaged the shift lock? All I know is I don't hear that normal click now when hitting the brakes while in Park.
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http://www.cb7tuner.com/vbb/showthread.php?t=209871
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Old 04-24-2018, 09:44 PM   #5
wtfisafleek
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I ended up replacing the shift lock, but in reality I think the problem was the incorrect, damaged TCU I was running. After replacing both components, the shifter is working correctly now.
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http://www.cb7tuner.com/vbb/showthread.php?t=209871
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