Today at Atelier Kaz - ex-Honda R&D, F1, Indy/CART engineer

The owner mentioned that from time to time, he loses audio sound from the left door speaker mainly when turning left.

So, carried out the test driving at least twice with some left turnings but couldn’t re-create the same issue.
It was very wet at the very beginning of the service so even tried it under mild condition but still no issues.

Any way decided to open the left side door panel.
The wiring and connector looked fine and also there didn’t appear to be any aftermarket modifications for security or ICE devices around the door harness area.






Thought about taking the Bose AMP out of the speaker box and also remove the audio head unit but since I couldn’t re-create the same issue, there was no way for me to test whether the issue was fixed or not so for now, I recommended the owner to keep monitoring it and if it happens again, remove the dashboard to deal with all sorts of aftermarket connectors, wires, etc behind the dashboard together with the audio head unit and possibly the Bose AMP (although if that was the case, it should not matter whether the car is turning left or not).






By the way, while having access to the connectors, applied silicone grease to the non-WPC spec connectors.






This moisture protection sheet has to be re-installed properly in the future.
While it’s still doing its job, the white sticky butyl tape is already dried out and doing almost nothing.
Someone placed the paper craft like tape instead and making the situation worse as it will absorb moisture and prevent the sheet from sticking to the door panel.....