R & R computer

[HRP]

1991 Reatta Convertible has a bad computer (behind the glove compartment). The main connections are behind the computer toward the firewall. Any sneaky suggestions as to how to disconnect (unplug) this computer. The connection is hidden from view and needs to be removed by feel.

Thanks,

HRP

[DAVES89]

Remove the glove. It is held in place by 10 torx screws. Two each outside edge of the glove box, three each going up inside the glove box and three down inside the glove box.. I believe it is either a #15 or 20 torx.

 Once the glove box is out you have to remove the control arm for the plenum door A/C/Heat, then you are pretty much there.

[89RedDarkGrey]

2 hours ago, HRP said:

1991 Reatta Convertible has a bad computer (behind the glove compartment). The main connections are behind the computer toward the firewall.

 

Which computer are you trying to R&R?

 

BCM OR ECM?

 

[KDirk]

Dave's instructions  get you access to the BCM, shown in the picture 89RDG posted above. The ECM is mounted vertically under the dash, down and rightward of the glove box and has its connections facing downward towards the floor pan. It is held in by a torx head screw through a plastic  bracket that is bolted to the corner of the ECM housing. 

 

It is difficult to get out, and will require removal of the hush panel under the dash, the vacuum manifold and harness from the HVAC programmer module, disconnect the three harness plugs and then it has to be pulled down and out. The floor carpeting where it wraps up the rocker forward of the door opening tends to get in the way. 

 

If swapping the BCM, make absolutely sure you swap the EEPROM  under the service cover as this stores the vehicles VIN, option programming and odometer. This is socketed in a plastic chip carrier with thumb tabs for east removal. Also need to swap the PROM that calibrates the module to the application  (year, make and model) as it isn't usually supplied with the replacement module.

 

[89RedDarkGrey]

UNPLUG THE BATTERY FIRST PLEASE THANK YOU.

[HRP]

Thanks to all who contributed. We replaced the ECM and all the fault codes (some were even conflicting)  and engine and tranny weird behaviors have stopped. I really appreciate the advice and pics. Made it easier to do so. Now the only thing left is to re-adjust the throttle regulator which will be a breeze.

Thanks again. Very grateful for and to this forum and the members!!

HRP

Greensboro, N.C.