No crank, No signal/power from either 38-Pins & OBD . - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 06-11-2019, 09:40 PM Thread Starter
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No crank, No communication from both 38-Pins & OBD .

Hi,
So I was shopping for a '00 E55 in my area, car has been messed with ( advertised as not shifting out of 1st gear), but nothing too major. I went with the seller to start the car with it's old battery, car has been sitting for a while.
At first the engine TURNED over once
. Ok no big deal, lets switch to a better battery. We did that, and all of a sudden, the car WON'T CRANK anymore.
I had brought my carsoft 7.4 with me. Plugged it to the 38 pins... No light at all... no communication from the 38 Pin.
I switched cables and pluged it in the OBD port... again , No signal at all from the OBD port. I even had a bluetooth OBD that I tried for good measure.
All the other accessories are working fine.

I'm suspecting a K40 Module problem. maybe a fried Ecu?
Are those 2 problems independent and maybe there could be a missing fuse for the 38-Pin AND OBD?
I wasn't gonna bother with the car, but I heard it turn myself once!
The battery is in top shape. OF course I'm in key position 2. I checked fuses only, nothing. Maybe relays?

What's your opinion?
Thank you!

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Last edited by michobebe; 06-12-2019 at 04:39 AM.
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post #2 of 7 (permalink) Old 06-12-2019, 04:57 AM
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The OBD and the 38 pin connector receive power from the 7.5 amp fuse on the K40 relay. There is only one 7.5 amp fuse so, you can't miss it.

Check the other K40 fuses too. It may be the fuse that powers the module box blower fan (along with the other modules)..
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post #3 of 7 (permalink) Old 06-12-2019, 10:15 AM Thread Starter
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Originally Posted by mrboca View Post
The OBD and the 38 pin connector receive power from the 7.5 amp fuse on the K40 relay. There is only one 7.5 amp fuse so, you can't miss it.

Check the other K40 fuses too. It may be the fuse that powers the module box blower fan (along with the other modules)..
Thank you! I remember checking specifically this 7.5A fuse which is located at the very end of the module and it wasn't blown. I would head there to check the others again. But do you think that could be related to the sudden No crank situation?

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post #4 of 7 (permalink) Old 06-12-2019, 10:32 AM
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Check the voltages on the fuses of K40 with respect to chassis ground, with the key in position 2.

The 7.5 amp fuse provides always on power to the diagnostic ports. It there is no voltage on the fuse, then I would look into battery power supply to the K40 itself.
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post #5 of 7 (permalink) Old 06-12-2019, 10:48 AM Thread Starter
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Originally Posted by mrboca View Post
Check the voltages on the fuses of K40 with respect to chassis ground, with the key in position 2.

The 7.5 amp fuse provides always on power to the diagnostic ports. It there is no voltage on the fuse, then I would look into battery power supply to the K40 itself.
Noted!
I will !! Thank you
Just to bae better informed/safe, Does the K40 receive direct power from some SAM or direct power from the battery, or any other fuse from the back?

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post #6 of 7 (permalink) Old 06-12-2019, 10:55 AM
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Either direct power from the battery (like the fuse 1 (7.5 amp fuse)), or the switched power (through the switchover relay of K40) from the ignition module (EIS). That is why you need to turn the key to position 2 to check the voltages on all the rest of the fuses.
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post #7 of 7 (permalink) Old 06-12-2019, 09:48 PM Thread Starter
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Originally Posted by mrboca View Post
Either direct power from the battery (like the fuse 1 (7.5 amp fuse)), or the switched power (through the switchover relay of K40) from the ignition module (EIS). That is why you need to turn the key to position 2 to check the voltages on all the rest of the fuses.
ok thank you again Sir!
I'll get back with updates asap

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