O7 SL550 exhibiting unusual behavior

jj_nuttall

I have had this 2007 550 for a decade. In the last three weeks, I have encountered an ABC warning, the trunk closure motor has ceased functioning, the driver's low beam is inoperative, and the driver's running light emits a faint glow that remains illuminated even after the key is removed.
Do you have any recommendations for a starting point?
It seems to be a grounding problem.
It may be a SAM problem, but I am uncertain where to investigate.

DaleZ

Is DAS (Xentry) displaying any information? Do you own an efficient scanner?

jj_nuttall

Recently acquired an Icarsoft MB V3.0. Unfamiliar with its use, but eager to attempt it.

sandra

Your concerns may be independent; but...

I would remove both front fuse boxes and inspect them for any rust. Identified problem with water infiltration into the modules.

The closure boot message may be indicative of a leaky boot lock. Simple resolution.

What constitutes the ABC message?

jj_nuttall

Do you have any ideas on which fuse box to inspect first? Which component regulates the front headlights?
The ABC message indicates a problem; pull over. The warning blinks only on significant bumps. I have checked the fluid level and replenished it; I will see whether this resolves the issue. Additionally, I opened and closed the trunk twice, and on the third attempt, the actuator successfully closed it. However, the left low beam warning persists.

sandra

Commence with the RHS option first, since it is more prone to overflow from clogged drains into the module.

jj_nuttall

RHS...right-hand side? Is it the driver's side?

sandra

It depends on your location; in Canada, the answer is affirmative.

The RHS is referenced when seated in the automobile, oriented front.

jj_nuttall

I feel humiliated.You are correct. Thank you, I am located in Canada.

sandra

Exercise caution with that matter; a certain automobile manufacturer determined that the left-hand side should be designated as such when seen from the front of the vehicle.

That module is notorious for causing issues.

In this sequence: inspect all fuses, remove the fusebox and clean it, ensure both batteries are charged and operational, do a comprehensive scan of the vehicle, erase any previously saved codes, and then assess any reoccurring issues or new problems that arise.