What are the two little boxes in front of ECU Box?

warmblood58 · Post by **warmblood58** » 28 Feb 2016, 19:43

: Here are the two pics; IMG_1765.JPG (36.98 KiB) Viewed 1366 times

Today, I noticed two little black boxes in front of the ECU box near the washer bottle filler on my new to me '95 850T5-r. I opened the cover and saw a button and a small red light display and an "A" next to button. There is a butt connection that can plugged into 6 different ports . . what is this? Alarm?

Post by **Ozark Lee** » 28 Feb 2016, 20:06

They are the OBD-I DTC boxes. You can interrogate all of the monitored systems in the car from those boxes.

If you don't have it, you can download the factory service manual here:

https://www.matthewsvolvosite.com/downlo ... vo_850.zip

In the manual each system and its related error codes, along with other diagnostic procedures, is spelled out in fairly concise terms.

...Lee

warmblood58 · Post by **warmblood58** » 28 Feb 2016, 20:22

Thanks! Now if I can just figure out why I have dash lights but no warning lights! Weird!

Post by **rspi** » 28 Feb 2016, 21:20