I am new to the Volvo forums but after reading a few threads seems you guys are quite the helpful bunch. I have a slight problem where maybe you guys can guide me in the right direction. On my moms 99 C70 the pass seat backrest has completely collapsed. It no longer stays upright. Tried to take the seat apart to see if anything was wrong however everything seems to be in tact. The back portion of the seat will not stay upright so it falls back completely. All the motors still work except the back portion of the seat will not stay up. Strange. Got into the car one day and i leaned back and then the whole portion fell back and since i cant get it to stay up. I have baseball bat holding it up wedged against the back seat. Pretty frustrating unless i can find a replacement seat or install some brace to hold it up. any guidance would be much appreciated. The seats in the C70s are not the greatest since on the driver side seat i had to replace one motor and two modules already.

Thanks in advance

 

if anyone has any schematics/oem parts guides or parts numbers as to what problem i may be encountering i would greatly appreciate it , that is if its a replaceable part.

 

There has to be something you missed while inspecting it inside. Maybe the gearbox is stripped out.

 

what gearbox are you talking about? The motor that controls the seat in the backrest? if so, like you stated it comes down to being the gearbox is that piece available for purchase?

 

The gearbox holds the seat into position.
Yes you could buy it.

 

any chances someone can get me apart number?

 

Did you open the seat to make sure that is the problem?
Yes I can get you a part # but you need to make sure that's it.
I don't want to see you spend all the money if that's not it.

 

opened up the seat and cant find anything else that holds the backrest up. the motor in the back rest is not working. there is power coming in but no output movement

 

Ok but do you see the rod spinning when the seat tilts foward and back?
Since you have power to it then I would also say the micro switch is still good.
Here is a parts beakdown of the seat.

 

excellent, thank you now i can trace what each part is and hopefully find the culprit. rod does not spin at all.

 

Then try to listen for the motor itself to spin maybe the plastic gear broke.