I am experiencing an unusual issue with my E320 W210. Bas/abs varnings are on since i have no brake lights. I replaced the switch, but there was no impact whatsoever. I get codes using Launch Scanner: C1200 brake light switch S91 P0703 brake signal plausibility.
The brake light switch receives electricity and activates when being pressed.
While testing the light bulbs, I saw that when I placed the iron "pen" on the light bulb, all three brake lights activated. I suspected a grounding issue; however, adding an additional ground wire had no impact.
I am devoid of ideas. I cannot go anyplace since my automobile has remained stationary for around 1.5 years at the location where I purchased it.
Furthermore, I possess no knowledge. Defective alternator or battery. No improvement after battery replacement; the alternator functions as intended.
Codes that I believe are interconnected:
B1123 incorrect authorization data
B1129 transmission malfunction
Any assistance would be appreciated.