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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53943
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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2015 GLK350, the reverse lamp stays on 24/7 w/o power to the

Customer Question

2015 GLK350, the reverse lamp stays on 24/7 w/o power to the vehicle
JA: Are you fixing your GLK350 yourself? What have you tried so far?
Customer: Yes, we removed the bulb to prevent killing the battery checked the wiring harness to make sure that there is no pinched wiring and all is good
JA: Does the battery look like it's leaking? And does it have a strong smell -- like sulfur?
Customer: no, the battery is fine the light on the driver's side stays on on in the tail lamp
JA: Anything else you want the mechanic to know before I connect you?
Customer: How do we get the left reverse light to turn off when the car is off?
Submitted: 9 months ago.
Category: Mercedes
Expert:  Marty replied 9 months ago.

Hi, this problem is typically caused by a faulty rear signal acquisition module. The module controls the rear lighting on the car. It is located in the rear cargo area. The new module will require programming with the Mercedes Star Diagnosis system.

Let me know if you have any questions.