2010 XC90 Executive - one full beam not working

1tinkerer · Dec 16th, 2023, 18:21

Hi all,
As in the title, I have only one high beam working. I think I have checked the obvious. I checked the bulbs and harness and even swapped the light units and both are working fine on the RHS. LHS is dead. I checked the fuses on the CEM under the steering wheel and both are good.
I put the multimeter onto the fuse and flashed the lights and both fuses are showing just over 12v.
Where can I look next and is this a common fault?

1tinkerer · Dec 16th, 2023, 22:03

Hi all,
Just as an update, I checked the voltage at the fuse (in circuit) and it was still at just over 12v. I checked the voltage at the front light connector and it is at 4.8v to earth, so there seems to be a problem between the CEM and the front light. Are there any connectors worth checking anywhere, just in case there is a bad joint, or am I looking at something more serious?

Dec 16th, 2023, 18:21	#1
1tinkerer New Member Last Online: Dec 22nd, 2023 20:24 Join Date: Jul 2014 Location: Loughgall	2010 XC90 Executive - one full beam not working Hi all, As in the title, I have only one high beam working. I think I have checked the obvious. I checked the bulbs and harness and even swapped the light units and both are working fine on the RHS. LHS is dead. I checked the fuses on the CEM under the steering wheel and both are good. I put the multimeter onto the fuse and flashed the lights and both fuses are showing just over 12v. Where can I look next and is this a common fault?

Dec 16th, 2023, 22:03	#2
1tinkerer New Member Last Online: Dec 22nd, 2023 20:24 Join Date: Jul 2014 Location: Loughgall	Hi all, Just as an update, I checked the voltage at the fuse (in circuit) and it was still at just over 12v. I checked the voltage at the front light connector and it is at 4.8v to earth, so there seems to be a problem between the CEM and the front light. Are there any connectors worth checking anywhere, just in case there is a bad joint, or am I looking at something more serious?

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