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Ask Juan Crespo Your Own Question
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 1523
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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LEFT HEADLIGHT WON'T COME ON CHANGED BULB S500 2000

Customer Question

LEFT HEADLIGHT WON'T COME ON CHANGED BULB S500 2000
Submitted: 1 year ago.
Category: Mercedes
Expert:  Juan Crespo replied 1 year ago.

Hi there. Thank you for posting your question.

When you turn on your headlights, the headlight switch sends a signal through the CAN network to both left and right SAM modules, which then power up the headlamps. In most cases, a failed SAM module circuit is the cause for a headlamp not coming on.

Best Regards.

Customer: replied 1 year ago.
Do you know what SAMs two under hood backseat and trunk
Expert:  Juan Crespo replied 1 year ago.

The right front SAM under the hood is responsible for powering up the left headlamp.

Best Regards.

Customer: replied 1 year ago.
Thank you I got it fixed
Expert:  Juan Crespo replied 1 year ago.

Glad you did!

Best Regards.