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I have a Ford Transit Connect 1.5 Ecoblue 2020.
The lights in the headlamp switch is flickering and the switch is sometimes lagging when turning lights on and off and sometimes not working at all.
Code B1533 Headlamp switch module bus signal/message failures.
Replaced switch still having the same problem.
All fuses are good.
I measured the light switch connector wires:
Green with red stripe 12.1v
Purple with green stripe 0.9v
Blue with grey stripe 0.89 -0.9v back and forth
Black with white stripe ground.
How much volt should a bus signal have?
Does anyone have a wiring diagram for this switch?
Here is a link for video of the problem:
https://files.fm/u/dj38bx5ntv
Last edited by Transit04; Dec 15, 2025 at 04:39 PM.
1) Check TSB 50869 and 51647
2) If you already replaced the switch you probably need to just reset the HL switch module and perhaps BCM module. Get Foxwell NT510 Elite w/ Ford from Amazon you should be able to reset both modules, then of course, keep the foxwell if you like it.
I should say, when your 2020 ford is relatively new you shouldn't have any wiring problem. Just a reset to the modules should do it.
Headlight switch flickering sometimes not working
