Volvo Owners Club Forum - View Single Post - Don't have dip lights but have side lights and full beam.

gatos · Feb 14th, 2018, 22:46

Did they fail both at the same time? Or one at a time?

If yourt car is from mid1999 onwards and you have a CEM, you can measure the voltage on the bulb connector with and without the bulb. Remove the bulb and measure the voltage. If you are getting 12V with the bulb off and 0V with the bulb on, then 99% it is the relays in the CEM that failed. If you get 0V with the bulb on and out, then it still might be the CEM, or it could be a wiring problem

Feb 14th, 2018, 22:46	#3
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	Did they fail both at the same time? Or one at a time? If yourt car is from mid1999 onwards and you have a CEM, you can measure the voltage on the bulb connector with and without the bulb. Remove the bulb and measure the voltage. If you are getting 12V with the bulb off and 0V with the bulb on, then 99% it is the relays in the CEM that failed. If you get 0V with the bulb on and out, then it still might be the CEM, or it could be a wiring problem __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba