Mercedes sprinter 906 EZS Problem 9s12dt256

**damianh6** · 22nd October, 2017, 03:41 PM

HI, I must solved problem, Mercedes does not respond to the key (central locking and insertion into the ignition). Everything worked ok with the car and suddenly it happened. I thought it was a steering lock, but I connected the emulator instead and it still does not work. So I think it's a switch, but the switch is good. I corrected the soldering on one side of the pcb. But I see that under the plastic on the other side is the 9s12dt256 processor or improve the solder is enough or have to change the processor charge because it is bad? ? Everything worked ok with the car and suddenly it happened.

**teerak2uk** · 22nd October, 2017, 04:24 PM

Originally Posted by damianh6

HI, I must solved problem, Mercedes does not respond to the key (central locking and insertion into the ignition). Everything worked ok with the car and suddenly it happened. I thought it was a steering lock, but I connected the emulator instead and it still does not work. So I think it's a switch, but the switch is good. I corrected the soldering on one side of the pcb. But I see that under the plastic on the other side is the 9s12dt256 processor or improve the solder is enough or have to change the processor charge because it is bad? ? Everything worked ok with the car and suddenly it happened.

Is key ok I've seen some with bad soldering and components come loose

**p1et** · 22nd October, 2017, 04:30 PM

Yup, first to check is always key. Most common is broken coil but when remote doesn't work, it might be just PCB broken / watered. If it's NEC chip, solder it to different key and check.

**damianh6** · 22nd October, 2017, 05:32 PM

Klucz jest dobry

**lpf01** · 22nd October, 2017, 08:28 PM

On Sprinter- Vito-Viano i met 2 main problems except te usual ESL or key fault:
- 1: key not accepted, but key ok, and remote work - check the reader coil it reads when you insert a key. if not, check microswitch on pcb near reader with a multimeter, usually broke.
- 2: everything seems fine, but you cannot read micro with programmer because "VCC overload" fault, than try to remove RF chip from PCB, sometimes got a short inside.