Radio scans through stations, can't push any buttons

bulb failure warning relay has failed.behind your front ashtray last relay on the left .round one change it try on ebay.

Ring a major volvo dealer. If you give them your engine or chassis number they should be able to provide you with the unlock code providing the radio is the original one fitted when new. Enter code using preset station numeric buttons. Write the code on the back of your sun visor for next time

Turn radio on and enter the code on the preset station numeric buttons Write the code on the back of the sun visor for next time the battery is disconnected

In general, the answer is yes. I have not changed one in quite a while but almost always you have to lift the engine to get the oil pan off. You need the oil pan off to loosen the main bearing caps.

This is a security feature. COD means Code. same thing happend to me on my volvo, i called the local dealership and they asked me for the vin and looked it up. hope it helps

Please stop posting useless responses like Bob above. This helps NO ONE!

check the large relay in the fuse box and push it down it works a number things

The original response is correct about acquiring the code from the dealer. However, if you just purchased the car, check inside the glove box/manual as it may be located there. Also, you may want to try pulling the radio out of the dash. I have found them written on the radio as well. Defeats the purpose, but some people do it anyway.

dim lights are generally bad ground / rusty -loose ground points or wires

I hope you've solved the problem by now, but there are alignment marks on the crank shaft (top pulley), idler (lower side), and cam shaft (smaller, bottom pulley) which should be aligned with stationary marks on the timing belt rear cover.

The belt has marks that align with the aforementioned marks (lines). The double marks on the belt align with the camshaft marks and the single marks with the others.

Loosen the tensioner clamp (nut) to allow the spring loaded tensioner to press on the belt and retighten the nut.

Rotate the crank shaft (clockwise, probably two revolutions) and make sure the pulley marks realign to the marks on the cover (they don't have to realign with the marks on the belt).

Rotate the crank shaft a full revolution once the belt is on and check that alignment is preserved.

Periodically loosen and retension the tensioner nut (access through a hole in the cover) to ensure that tension is maintained as the belt relaxes.