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Guest Message by DevFuse

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low beams do not work

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1 reply to this topic

#1 OFFLINE   sixxgunscott


    New Member

  • C-MAX Hybrid Member
  • 5 posts
  • Region:U.S. Pacific Coast
  • LocationLos Angeles, CA
  • Current Vehicle:2013 Ford C-Max SEL

Posted 29 December 2015 - 11:01 AM

My low beam headlamps suddenly do not work at all. Will not come on in Auto Setting or Manual. High Beams work fine. Fuse F74 which the manual states as the Headlamp Supply is OK. As both Right and Left Low Beams do not work, I am expecting the problem to be a Relay. Any ideas?

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#2 OFFLINE   Plus 3 Golfer

Plus 3 Golfer

    C-Max Hybrid Member

  • C-MAX Hybrid Member
  • 2,049 posts
  • Region:Decline
  • Location"Valley of the Sun" - AZ
  • My C-MAX's Year:2013
  • Current Vehicle:2013

Posted 29 December 2015 - 12:28 PM

Are you still under the 3/36 B2B warranty?   


The Body Control Module controls the high / low beams (there are no switching components (relays) that can be replaced). The first thing to do is to verify that the low beam bulbs are okay. The headlight switch communicates with the BCM over the Local Interconnection Network (see quote below).  The headlight switch (with fogs) has an MSRP of about $134.


I keep harping on this but for about $30 one can get an ELM327 adapter to plug into the OBDII port and the ForScan App for a smartphone to scan modules for Diagnostic Trouble Codes.  There are a number of DTC for the headlamps and BCM.


"Low Beams


The headlamp switch sends a status message over the LIN circuit to the BCM to indicate the headlamp switch status (position or a fault within the headlamp switch).


If the BCM detects a fault from (or loses communication with) the headlamp switch, the BCM turns the parking lamps and headlamps on. This is normal behavior of the BCM design as a fault has been detected with the inputs from the headlamp switch.


When the BCM receives a message requesting the headlamps on, it supplies voltage to the headlamp bulbs." 

Edited by Plus 3 Golfer, 29 December 2015 - 12:37 PM.

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