changyi70

I can’t activate my blind spot assist after a front-end collision with a deer.

I scanned with xentry, it shows that all modules are “out of permissible range”.

Does that mean that those units needs to be replaced or reprogrammed it.

many thanks.

CaliBenzDriver

You hit a deer with your rear bumper radars...


REAR Modules

Did that happen while backing out of your driveway??

Usually unprotected rear radars get soaked by wheel projections.

changyi70

Sorry for confusion. It was a front end collision. It shows rear sensors but also deactivated front radars as well. But same messages. Deactivated pre-safe , distronic plus as well.

CaliBenzDriver

Okay then, you know you likely have bad front sensors.

Lot's of confusion already,
While getting focused

Pls get a complete fault scan to survey the extent of your radar issue.
Repair will likely require dropping your bumper.

changyi70

many thanks for your reply.

here are some pictures for your reference.

CaliBenzDriver

Recap: you impacted a road-hazard then front radars were bad... what could be wrong??
the radar module at impact sight.

The bad radar is also shorting out the control CAN Network such that even good radars can no longer work.
Replace or disconnect bad unit for testing.

changyi70

Yes. It was a very severe collision, right headlight, front grille and the hood were gone.

CaliBenzDriver

The harness connector to front radar is located on Bank1 side (passenger side) behind the plastic wheel cover, attached to bumper skin cover near headlights.


At this point we can guess the radar damages were not repaired well if at all... body repair shops don't exactly focus on system repair nor testing.

Arrie

Seems to me the main Distronic sensor in the middle in front has gone bad. I understand this sensor is the brain for the whole radar system including the rear sensors that should not have been damaged in the front-end collision, but xentry gives errors for those. Could also be a bad harness connector to the front middle unit.

BenzV12

Sorry to hear about that collision . Glad , you're OK . Worst case scenario, you will need to replace entire unit which I hope you don't have to

changyi70

I’m ok. Thank you for asking. Just body damage, no air bag deployed. It happened a year ago.

I may check the connection tomorrow, to see any issues at all.

thank you guys for everything.

CaliBenzDriver

We as a group of helpful MB members are glad to help you regain sanity in time of crisis .... we all gave days in hell when we need MBWORLD
Everything MB is super predictable - The ownership rollercoaster is easily improved for wise men, to some extent.

I've recently evidenced that perfect performance can be had after canceling couple gotchas:
the poor restricted oiling
the poor overwhelmed networking

EXACT ENG. PERFORMANCE does not tolerate any randomn timing delay.
DUH

pierrejoliat

I cold be 100% wrong Cali, but it sounds like they want to be calibrated?

CaliBenzDriver

.... they self-calibrate during drive. Even SCN'd is reported unnecessary.

Question is... where do mid-range bumper radar modules connect to in absence of long distance DistronicPlus central radar ??


Here it seems the impacted front radar screws-up the rear one too!
Perhaps the rear radars were soaked before the front radars got impacted...

changyi70

Yeah. I think you’re right.

Still same issues even after disconnecting from the front radar. Should I exchange every one of radars to new one, to get fixed?

Are there any way around?

CaliBenzDriver

Thats when you decide how to spend your money.. you can test modules to identify the bad ones or you can replace parts...

I am going to try to identify how the 4x mid-range radars are interconnected (CAN-E1 + CAN-E2 + ZGW...) so I can make more sense of interactions Front vs. Rear modules.

Quint22

I dont recall the thread but thought that if one or more of the sensors fails that the system stops working? Not a redundant system if you will.

CaliBenzDriver

No redundancy here for sure.
Bumper radar modules are unlike bumper parking sensors. Not be mixed-up.

Resulting issues depend how the radar modules fail.
-- When the bus is shorted it's game-over!
-- When the connections are poor: it's traffic flood!

On some chassis, the rear radar can cause the "no crank/no start" relieved by unplugging soaked bumper modules.

Tomorrow I am going to try and go visit my 2x front bumper side radars for preventive maintenance - They've been loaded with fault since factory installed... I am hopeful about fixing the defective solderless connection to make these work reliably.

Once I get some hands-on time, I'll know more I can share... These are my last solderless modules - I will have surveyed and totally eliminated 100% of that artificial chaos to gain perfect networking bandwidth for vibration-free engine + tranny A-to-Z chassis performance.

changyi70

FYI, somehow I found that cgw(central gateway) has no input voltage at all, showing Xentry. I didn’t capture the image but I try upload that later.

CaliBenzDriver

Yes, please. Bosch CGW is one of the main chassis modules.
Without voltage, CGW would silently be missing and the car would show X-Mas tree lights.

Remember to expect missing Voltages when IGN:OFF, right?
SAM's activate all the various circuits with power relays

changyi70

I might have confused or something else that I couldn’t find the cgw screen that I looked up last time. It looks works fine to me again. I think you right I was my ignition off. 😂

CaliBenzDriver

Don't worry... everything's always about details.