low beam not working Focus C-Max 2012

Glynn Owner/Technician United Kingdom Posted   Latest  

Ford Focus C-Max 2012 diesel 1.6, front driver’s side “dip headlight/low beam H7 bulb” showing NO supply volage, earth/ground lines are good. 

Fuse board cover/user manual does not show a fuse location for driver side low beam.

The front passenger side “Low beam h7 bulb” is LOW Beam working okay. We assume the headlights are on two circuits.

The rear driver's side stop light is faulty “no illuminating”, not-investigated so far.

Does anyone have any info on power supply diagrams or info?

DTC'S C111A:15-6C, B1DO1:15-6C, B1D01:11-6C, U1000:00-6C 

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Kevin Owner
Louisiana
Kevin
   

This is a diagram for 2012 focus. I don't show info for diesel. Hopefully this is the same. Looks like low beam power feed comes directly out of bcm. I have restored power feeds like this in past simply by a hard reset shorting battery cables together.

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Glynn Owner/Technician
United Kingdom
Glynn
 

Thank you, kevin - for your info, best wishes glynn

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Brett Technician
New York
Brett
 

Have you unplugged the connector at the light? I have dealt with a couple of these stateside that ended up being green piles of junk on the drivers side only. Not sure if this applies to you though.

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Glynn Owner/Technician
United Kingdom
Glynn
 

Hi Brett — REMOVED PLUG AND CHECKED ALL PINS/CONNECTOR AT LIGHT FITTING, ALL CLEAN AND GOOD, PROBLEM IS NO POWER TO the CONNECTOR FROM THE SUPPLY CABLE at THE BCM. LOOKING LIKE A BROKEN SUPPLY CABLE OR A BCM INTERNAL ISSUE, BUT STILL NOT SURE. THANKS FOR YOUR INPUT

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Timothy Owner/Technician
Wisconsin
Timothy
 

Since you're on the other side of the road, RHD compared to us, the codes are different for us. The passenger side is the driver's side for us, and vice versa for you. So, it's the ‘right’ side for you that has an issue? Try flipping/swapping the headlight assemblies and see if it works then. If the BCM sees a short on the line, it'll shut off the supply pretty quickly. You can use an ammeter…

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Eric Owner/Technician
Wisconsin
Eric
 

If you clear the codes do they reset? (make sure everything is connected when checking for codes) If I remember correctly, the BCM will shut off the power supply to the headlight when the codes set and won't turn it back on until the codes are cleared. If the problem still exists the codes will reset immediately after clearing them. You need to clear the codes, operate the headlights and then…

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Glynn Owner/Technician
United Kingdom
Glynn
 

Hi thanks for your input. The codes do reset again, but no supply voltage is being sent to the bulb-connector, we assume a bias voltage would be in place to allow the ECU to determine that a circuit is available “no opens” But no bias voltage can be noted at bulb-connector, now we have a wiring diagram we are to go to the BCM terminal and take a reading to see if voltage is available on the…

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Eric Owner/Technician
Wisconsin
Eric
 

From memory, you have to have a complete properly functioning circuit for the system to work. The codes set instantly, no bias used, just current above or below spec causes instant code set. Disconnect the BCM and attempt to light the headlight with jumpers (make sure to use a fused jumper) to battery and ground at the BCM connector. Measure current flow and compare it to the other side…

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Glynn Owner/Technician
United Kingdom
Glynn
 

Hi Eric, thanks for your valued inputs. We will try your suggestions.

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Caleb Diagnostician
Indiana
Caleb
 

Do you have a wiring diagram for the 2 affected light circuits? If so please post them. In regards to your question about there not being a fuse labeled “headlights” etc. This is common across many manufacturers especially on BCM's. The BCM simply uses a number of power inputs to power up the various outputs including the headlights/taillights etc. In your case there is possibly a missing power…

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Geoff Diagnostician
Hawaii
Geoff
   

Caleb, You just reminded me of a GMC Encore that the fuse purported/labeled to be for the Dome Lamps actually runs one headlight. Even sets a DTC for interior lighting... which is never the "complaint".

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