MB X204 Circuit 50: no crank. Can I replace the 5 legs starting relay by 4 legs one

11-25-2019 | 07:52 AM

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kilog

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From: Douala

E550

MB X204 Circuit 50: no crank. Can I replace the 5 legs starting relay by 4 legs one

Hello there,

I have an X204 that have all the signals (except 31 circuit that I do not master) ready to crank on the 5 legs starting relay, but it does not.
It seems like if I replace the 5 legs starting relay by 4 legs relay (see the attached pictures) it may work.
This adaptation suppress the 31 circuit on the starter wiring through the diode inside the 5 legs relay.
Please can someone tell me:
1- what is the diode inside the 5 legs relay (A0025427619) for?
2- Am I right if I guess it is a 12V Zener diode dedicatedto stabilize the tension on the starter solenoid?
3- Is there any danger to suppress the 31 circuit on the starter wiring?

Best regards
(the pictures are taken from Mercedes PE54.21-P-2106-97FAF wiring diagram)

Last edited by kilog; 11-25-2019 at 08:20 AM.

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