2020 Mazda CX-5 lost communication w TCM
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Junior Member
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From: Phoenix
2020 Mazda CX-5 lost communication w TCM
I am working w my crashed Mazda Cx5 2020 with a current code of U0100 lost communication with TCM. No front radar no cruise control and no front facing camera working. Car has check engine light on and i need to troubleshoot the circuit. Anyone knows where to get the TCM circuit diagram
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Joined: Jul 2020
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From: Northeast USA
The ATX connector has pinout:
A (yellow) -pwr
B (black) - gnd
C (violet) - pwr
J (yellow) - starting system
E (white) and F (red) - HS-CAN
G (brown) and H (grey) - MS_CAN
Have you checked to see if the AT fuse is OK?
A (yellow) -pwr
B (black) - gnd
C (violet) - pwr
J (yellow) - starting system
E (white) and F (red) - HS-CAN
G (brown) and H (grey) - MS_CAN
Have you checked to see if the AT fuse is OK?
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Junior Member
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From: Phoenix
Yes damaged been repaired i can film the car and put it on youtube. We bought a replacement radar from ebay and no luck i dont know if they blow like airbags when a car crash.
How can i check the wiring diagram. I have a power prope yellow and black got power
How can i check the wiring diagram. I have a power prope yellow and black got power
Senior Member
Joined: Jul 2020
Posts: 171
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From: Northeast USA
Yellow and violet should have power, black should be ground. Test voltage with a multimeter - key on - one probe to the connector and the other to opposite polarity battery post. I'd have very little faith in a reader that's displaying the wrong vehicle. Forscan is one that definitely does support your vehicle.
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Joined: May 2012
Posts: 7,847
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From: Queensland Australia
Are you 100% sure all the front wiring loom is in perfect condition?
Are you 100% sure all the earth points on the front & 1/4 panels are clean & free of paint?
Was the replacement radar calibrated to your vehicle & aligned using appropriate equipment?
Are you 100% sure all the earth points on the front & 1/4 panels are clean & free of paint?
Was the replacement radar calibrated to your vehicle & aligned using appropriate equipment?
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Junior Member
Joined: Jun 2023
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From: Phoenix
The transmission lcd flicker the electrician suspect a bad ECU but im not buying it still. This mazda has a demon in it.
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From: adelaide
I am working w my crashed Mazda Cx5 2020 with a current code of U0100 lost communication with TCM. No front radar no cruise control and no front facing camera working. Car has check engine light on and i need to troubleshoot the circuit. Anyone knows where to get the TCM circuit diagram
Hi did u fix ur problems?i just wondering i have some problems do u know how to fix this after crash car not turn on is show code u0100 . What should i do ?thanks
Last edited by amos2727; Jan 31, 2024 at 01:38 AM.
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Joined: Mar 2025
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From: Nc
Solution?
Did they give you a solution? The same thing happens on my 2020 Mazda CX5
I am working w my crashed Mazda Cx5 2020 with a current code of U0100 lost communication with TCM. No front radar no cruise control and no front facing camera working. Car has check engine light on and i need to troubleshoot the circuit. Anyone knows where to get the TCM circuit diagram
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