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I experience a bunch of problems with my 2007 Mazda 3's electrical system:

The most annoying issue is that I hear [a rather loud] engine noise when I connect a phone to the AUX (3.5mm audio jack) line while it is simultaneously being charged through a cigarette lighter adapter. The noise goes away when the power line is disconnected. Somehow related to this issue: even when the charging cable is disconnected and the aux input is in use, whenever I change the [automatic] transmission into/from "Parking" mode, the connected phone panics (hangs). It seems as if a surge goes through the AUX line.

Similar threads on this forum [1, 2] suggest ground issues as the possible root cause of these kind of problems. Is there any systematic method to isolate/find the fault?

• [1] Audio noise when laptop connected to power inverter and the car's 3.5mm audio jack
• [2] Series of troubling electrical problems in my '07 Mazda 3. Any ideas?

I experience a bunch of problems with my 2007 Mazda 3's electrical system:

The most annoying issue is that I hear [a rather loud] engine noise when I connect a phone to the AUX (3.5mm audio jack) line while it is simultaneously being charged through a cigarette lighter adapter. The noise goes away when the power line is disconnected. Somehow related to this issue: even when the charging cable is disconnected and the aux input is in use, whenever I change the [automatic] transmission into/from "Parking" mode, the connected phone panics (hangs). It seems as if a surge goes through the AUX line.

Similar threads on this forum [1, 2] suggest ground issues as the possible root cause of these kind of problems. Is there any systematic method to isolate/find the fault?

• [1] Audio noise when laptop connected to power inverter and the car's 3.5mm audio jack
• [2] Series of troubling electrical problems in my '07 Mazda 3. Any ideas?

I experience a bunch of problems with my 2007 Mazda 3's electrical system:

The most annoying issue is that I hear [a rather loud] engine noise when I connect a phone to the AUX (3.5mm audio jack) line while it is simultaneously being charged through a cigarette lighter adapter. The noise goes away when the power line is disconnected. Somehow related to this issue: even when the charging cable is disconnected and the aux input is in use, whenever I change the [automatic] transmission into/from "Parking" mode, the connected phone panics (hangs). It seems as if a surge goes through the power line.

Similar threads on this forum [1, 2] suggest ground issues as the possible root cause of these kind of problems. Is there any systematic method to isolate/find the fault?

• [1] Audio noise when laptop connected to power inverter and the car's 3.5mm audio jack
• [2] Series of troubling electrical problems in my '07 Mazda 3. Any ideas?

I experience a bunch of problems with my 2007 Mazda 3's electrical system:

The most annoying issue is that I hear [a rather loud] engine noise when I connect a phone to the AUX (3.5mm audio jack) line while it is simultaneously being charged through a cigarette lighter adapter. The noise goes away when the power line is disconnected. Somehow related to this issue: even when the charging cable is disconnected and the aux input is in use, whenever I change the [automatic] transmission into/from "Parking" mode, the connected phone panics (hangs). It seems as if a surge goes through the AUX line.

Similar threads on this forum [1, 2] suggest ground issues as the possible root cause of these kind of problems. Is there any systematic method to isolate/find the fault?

• [1] Audio noise when laptop connected to power inverter and the car's 3.5mm audio jack
• [2] Series of troubling electrical problems in my '07 Mazda 3. Any ideas?

I experience a bunch of problems with my 2007 Mazda 3's electrical system:

The most annoying issue is that I hear [a rather loud] engine noise when I connect a phone to the AUX (3.5mm audio jack) line while it is being charged simultaneously through a cigarette lighter adapter. The noise goes away when the power line is disconnected. Somehow related to this issue: even when the charging cable is disconnected and the aux input is in use, whenever I change the [automatic] transmission into/from "Parking" mode, the connected phone panics (hangs). It is as if there is a sudden surge on the power line.

Similar threads on this forum [1, 2] suggest ground issues as the possible root cause of these kind of problems. Is there any systematic method to isolate/find the fault?

• [1] Audio noise when laptop connected to power inverter and the car's 3.5mm audio jack
• [2] Series of troubling electrical problems in my '07 Mazda 3. Any ideas?

I experience a bunch of problems with my 2007 Mazda 3's electrical system:

The most annoying issue is that I hear [a rather loud] engine noise when I connect a phone to the AUX (3.5mm audio jack) line while it is simultaneously being charged through a cigarette lighter adapter. The noise goes away when the power line is disconnected. Somehow related to this issue: even when the charging cable is disconnected and the aux input is in use, whenever I change the [automatic] transmission into/from "Parking" mode, the connected phone panics (hangs). It seems as if a surge goes through the power line.

Similar threads on this forum [1, 2] suggest ground issues as the possible root cause of these kind of problems. Is there any systematic method to isolate/find the fault?

• [1] Audio noise when laptop connected to power inverter and the car's 3.5mm audio jack
• [2] Series of troubling electrical problems in my '07 Mazda 3. Any ideas?