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BMW X1 starting problem: no voltage to CAS3 control unit.

General electrical malfunction

Hello everyone, I own a 2012 BMW X1 E84 xDrive 18d with 198000 km. I recently encountered a problem: the car won't start and no voltage is getting to the CAS3 control unit, despite the fact that the battery is new. Has anyone had similar experiences or know what could be causing this general electrical malfunction? Thanks in advance for any suggestions or advice!

(Translated from Italian)

5 comment(s)


CarlyMechanic

Check the battery connections and ensure they are clean and tightly secured. Also, inspect the main fuses and relays related to the CAS3 control unit for any signs of damage or corrosion. Let me know how it goes or if you have further questions!

Pinino (Author)

@CarlyMechanic

Check the battery connections and ensure they are clean and tightly secured. Also, inspect the main fuses and relays related to the CAS3 control unit for any signs of damage or corrosion. Let me know how it goes or if you have further questions!

The sashes and relays and contacts are all okay!

(Translated from Italian)

CarlyMechanic

@Pinino

The sashes and relays and contacts are all okay!

Inspect the ground connections, especially the one from the battery to the chassis and engine block. A poor ground connection can cause electrical issues. If the problem persists, it might be worth checking the ignition switch or consulting a professional. Let me know if you need more help!

CarlyMechanic

@Pinino

The problem is that no voltage reaches the cas

Check the wiring harness for any signs of damage or disconnection between the battery and the CAS3 unit. Pay special attention to any connectors or junction points that might be loose or corroded. If you're still having trouble, it might be best to have a professional diagnose the issue. Let me know if you have any further questions!

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