Hi,
My 2006 X164 has developed a fault with the brake/rear light monitoring system. I have changed the lamps and cleaned the contacts behind the lamps and on the multi-pin connector to the light cluster. The fault intermittently occurs on the left and right sides and disappears when I take the clusters out and fiddle on with them for a bit. When operational the rear lights work as they should. I don't get any other faults with the other lamps in the rear cluster.
It obviously looks like a bad connection somewhere but I am puzzled as to why the brake/rear light fault detection circuit is so sensitive. Is there a common component that could be causing this issue? The lighting system is obviously fairly complex using PWM to use the same lamp filaments for rear and brake. Does anyone know how the fault monitoring system works? I had assumed that the monitoring system sent a short voltage pulse out and monitored for current flow.
Cheers
My 2006 X164 has developed a fault with the brake/rear light monitoring system. I have changed the lamps and cleaned the contacts behind the lamps and on the multi-pin connector to the light cluster. The fault intermittently occurs on the left and right sides and disappears when I take the clusters out and fiddle on with them for a bit. When operational the rear lights work as they should. I don't get any other faults with the other lamps in the rear cluster.
It obviously looks like a bad connection somewhere but I am puzzled as to why the brake/rear light fault detection circuit is so sensitive. Is there a common component that could be causing this issue? The lighting system is obviously fairly complex using PWM to use the same lamp filaments for rear and brake. Does anyone know how the fault monitoring system works? I had assumed that the monitoring system sent a short voltage pulse out and monitored for current flow.
Cheers