Mercedes S400 Hybrid W221.195 Does Not Start

[Pi_Art]

My Mercedes S400 Hybrid W221.195 won't start.

Tested diagnostic software:

1/ME-SFI 17.7
- Control unit: ME177
- MB object number for hardware: Unknown data
- MB object number for software (FLASHLOADER): Unknown data
- MB object number for software (CODE): Unknown data
- MB object number for software (DATA): Unknown data
- Supplier: Bosch
- Software status: 6v12090kS0001
- Diagnostic ID: 021510
- Version (internal): VC12_1_0

2/REAR SAM: Fault

Replaced the battery with a new one.
REAR and FRONT SAM. Checked fuse (still working). Checked fuse with voltmeter.
Help me please! Thank you very much.

 

[Mersovod]

It looks like there is no power in the ME unit.

 

[mpaavi]

What diagnostic tool?

 

[Filipov1912]

As if it didn't read, that's why it gives unknown errors. Maybe recognition is needed, you can try with Xentry.

 

[krugger]

If I remember correctly, the W221 is an MHEV and uses a 48V battery. They lock up if their charge level drops too low, and since the 12V battery is charged by a DC/DC converter, the charge drops too. The voltage on a 12V battery should be 13.8V immediately after the ignition is turned on. If not, check the 48V battery. If everything is OK, the DC/DC converter (located inside the 48V battery) may be faulty.

 

[Pi_Art]

Thanks bro! I checked the DC/DC converter and found that there was water in it. I am now ordering a new one to replace and check it.