Vida CEM swapping

Post by **RickHaleParker** » 30 Dec 2021, 19:49

Canadian Moose wrote: 30 Dec 2021, 19:05 Will give it another go tomorrow.

When was the last time you downloaded the code?

Post by **vtl** » 30 Dec 2021, 20:23

Canadian Moose wrote: 30 Dec 2021, 19:05 Tried to crack the pin twice today unsuccessfully on 2007 XC70. CEM p/n: 30786890. Got the first 2 digits the same both times 79, 92 but on third digit got 2 different numbers. Will give it another go tomorrow.

Attach your logs.

Canadian Moose · Post by **Canadian Moose** » 31 Dec 2021, 08:16

The code was downloaded yesterday. How do I go about getting the logs?

Canadian Moose · Post by **Canadian Moose** » 31 Dec 2021, 08:50

Attaching serial output. Tried again this morning, no dice.

Post by **RickHaleParker** » 31 Dec 2021, 17:54

Canadian Moose wrote: 31 Dec 2021, 08:50 Attaching serial output. Tried again this morning, no dice.

Hardware construction can make a difference. Particularly on the third byte, which is is harder to detect.

Post pictures of your hardware, close up and high resolution. We might be able to spot something.

Post by **RickHaleParker** » 31 Dec 2021, 18:05

urosm wrote: 29 Dec 2021, 02:12 The connections in the Teensy should be fine, as I read several P2 models without any problems.

All electronics have manufacturing variations. There will be some units that need that extra edge. This project does push the envelope. .001s do add up.

Canadian Moose · Post by **Canadian Moose** » 01 Jan 2022, 10:45

Not my prettiest work but you get the idea.

Post by **vtl** » 01 Jan 2022, 12:23

Canadian Moose wrote: 31 Dec 2021, 08:50 Attaching serial output. Tried again this morning, no dice.

Code: Select all

diff --git a/volvo-cem-cracker.ino b/volvo-cem-cracker.ino
index e72d843..3a6b14f 100644
--- a/volvo-cem-cracker.ino
+++ b/volvo-cem-cracker.ino
@@ -781,8 +781,10 @@ void cemCrackPin (int maxBytes, bool verbose)
   memset (pin, 0x00, sizeof(pin));
 
   /* try and crack each PIN position */
-
-  for (i = 0; i < maxBytes; i++) {
+  pin[0] = 0x79;
+  pin[1] = 0x92;
+  pin[2] = <try placing numbers from top-6 short list>
+  for (i = 3; i < maxBytes; i++) {
     crackPinPosition (pin, i, verbose);
   }

Here's how to start with the third position, try a few bytes from top-3 or top-6, start with 0x97.

Post by **vtl** » 01 Jan 2022, 12:25

Code: Select all

CPU Maximum Frequency:   24000000
CPU Frequency:           180000000

Huh? 240 Mhz? Not 600?

Eh, even 24 Mhz... Something is not right.

Canadian Moose · Post by **Canadian Moose** » 01 Jan 2022, 15:24

vtl wrote: 01 Jan 2022, 12:25
Code: Select all
CPU Maximum Frequency:   24000000
CPU Frequency:           180000000
Huh? 240 Mhz? Not 600?

Eh, even 24 Mhz... Something is not right.

That's a good catch. I must've changed that setting manually last year when I was messing with my 2002 CEM and never changed it back. Gonna try to start at third position and see if it's able to do it. Looks like first 3 are 79 92 and 97.