about my volvo...

You might want to try over in the trucks forum,

 

Have you looked in the owners manual (if you have one) or on the back of the panel where the fuses go, most trucks have a schematic somewhere

 

Same problem at times here. Clutch pedal and switch on pedal are not contacting. Adjust clutch, pedal travel, replace hold back spring, check and/or replace switch on pedal.

 

if you look at the brake pedal and the clutch pedal there two microswitchs and they can be adjusted , they are mounted on a brackets ,when you push on the pedals you (must) here them click ,if not check the adjustment , sometimes the the return spring on the clutch will break the pedal will seat a little low ,and on the brake pedal if you have any play in it it will also seat low causing the microswitch not to work , try to adjust the swtichs

 

Maybe it's the computer, knowing Volvo they have a computer for it somewhere. Everything on them trucks is controlled by a computer, even the lights.