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Checking the wrong pins could have really set you down the wrong path !!!….If you are seeing 120 ohms on 12-13 the wiring is NOT fine...you have a broken wire or module somewhere...you read 60 ohms because 2 (Airbag and EBCM) each 120 ohm resistors WIRED IN PARALLEL EQUALS 60 OHMS...what you need to do is split the bus in half to see where the break is...disconnect the chassis control module connector and now jump pins 2 to pin 5...now go and check the resistance at 12 and 13 at the DLC...if you read 120 ohms the break is not from the chassis module back to the DLC...now take your ohm meter and go from pins 3 to 4....if there is a break in the wire between the chassis module and the EBCM you will read an OPEN with the ohm meter...understand what we are trying to do here ????...sorry but I think this diagnosis may be a little over your mechanics head and you need a shop that only works on car electrical systems…this can also be a break in the circuit for that module also…BTW, communication wire are always next to each other on a connector and are called a “twisted pair” because each of the 2 wires are twisted together…what you can also do is disconnect each module and jumper the wires going in and out of the module and see if 60 ohms returns…this depends if the bus wiring is ok…this will not be easy.
Thank you for the explanation, we will arrange the test you told and get back to you with the result.
I think we found the problem.
while checking the resistance between PIN 12 and 13 on the DLC giving 120 ohms as result, my mechanic went on and slightly plugged and unplugged the EBCM connector, and on the multimeter for a split second appeared 60 ohms,
He kept going on by moving the connector and kept switching from 120 to 60 ohms.
Apparently is a false contact in the connector or some wire behind it.
But now we have located the issue, and we can work for solve it.
Thank you so much again for the extremely helpful tips, will update once fixed.
I think we found the problem.
while checking the resistance between PIN 12 and 13 on the DLC giving 120 ohms as result, my mechanic went on and slightly plugged and unplugged the EBCM connector, and on the multimeter for a split second appeared 60 ohms,
He kept going on by moving the connector and kept switching from 120 to 60 ohms.
Apparently is a false contact in the connector or some wire behind it.
But now we have located the issue, and we can work for solve it.
Thank you so much again for the extremely helpful tips, will update once fixed.
Update:
Finally we figured out the issue, one PIN in the EBCM connector was bad, we replaced it and currently it shows a perfect 60 ohms resistance on the PIN 12, 13!
Thank you so much for the incredible help shown and all the information aswell, we wouldn't have made it without you!
Glad to hear !!…so are all modules communicating again and all trouble codes gone ??…a lot of these issues are modules or connectors that are exposed to the elements such as the EBCM…nice to see they are using a good DVOM…LOL !!
Glad to hear !!…so are all modules communicating again and all trouble codes gone ??…a lot of these issues are modules or connectors that are exposed to the elements such as the EBCM…nice to see they are using a good DVOM…LOL !!
I've just got there with my GDS2 diagnostic, and yet we double checked again we have 60 ohms, the 2 modules that weren't communicating before (the Steering Wheel Angle Sensor and the Rear Differential Clutch Module) are still not communicating.
even after clearing all the DTCs are still labeled as "not communicating" even though again, I am able to enter both modules, actuate them, and read values.
there is some operation to do in order to make them communicating again?
Is this is similar to what you’re seeing with the scan tool trying to communicate with those 2 modules ??…if you can read live data on the car you should not be seeing this on the scan tool…do you have another scan tool you can try that can communicate with all modules ??…maybe try a few ignition cycles.
Is this is similar to what you’re seeing with the scan tool trying to communicate with those 2 modules ??…if you can read live data on the car you should not be seeing this on the scan tool…do you have another scan tool you can try that can communicate with all modules ??…maybe try a few ignition cycles.
No, what i see is just in the main page showing all the modules situation, a label saying "no communication" (see on the right) but if i enter both modules i have no messages about, no DTCs, nothing and perfectly able to perform any operation or read values like real time.
So can you click on each of those 2 modules and see if you can read live data ??…if the car starts please show me a picture of your live data from those 2 modules if the car starts..a picture of a voltage reading or something similar.
So can you click on each of those 2 modules and see if you can read live data ??…if the car starts please show me a picture of your live data from those 2 modules if the car starts.
Yes the car start and I can read live data.
I now left 30 minutes the battery disconnected to reset the communication line of the canbus.
I'll go and check again later and update.
Yes the car start and I can read live data.
I now left 30 minutes the battery disconnected to reset the communication line of the canbus.
I'll go and check again later and update.
There is really no “reset” of the comm line but like I said try another scan tool if you can…and no new trouble codes have set ??
We checked again, we have correct Voltage of 2.7V on one and 2.3V on other, normal technically.
Ohm correct (60 ohms) on 12,13 and 16,4 as well, so all CAN are correct.
Yet I have the Code in the EBCM U0422-00 that won't clear.
Last edited by s n v f f; Oct 18, 2024 at 03:55 AM.
There is really no “reset” of the comm line but like I said try another scan tool if you can…and no new trouble codes have set ??
We checked again, we have correct Voltage of 2.7V on one and 2.3V on other, normal technically.
Ohm correct (60 ohms) on 12,13 so all CAN parameters correct in voltage and resistance.
Yet I have the Code in the EBCM U0422-00 that won't clear and RDCCM and SWASM always non communicating.
Try another scan tool and check the power and grounds for both of those modules…that’s about all I can tell you…I don’t see a U0422 in Service Information.
Try another scan tool and check the power and grounds for both of those modules…that’s about all I can tell you…I don’t see a U0422 in Service Information.
Tried with Launch and Texa aswell, same DTC.
Will check the ground aswell.
thanks
