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Today at Atelier Kaz - Private NSX Enthusiast, ex-Honda R&D engineer with F1, Indy/CART background

A/C CCU Board service 02

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The usual process…..

But unlike other CCU boards, had to remove both green connectors......

Ready for the bench testing and this was when I found the issue with the fan speed control.

Everything works except for the fan speed.

It only drives the power Tr when at max speed setting.

No chopping of Tr base current and simply not switching the power Tr at all.

Dead light bulb so replaced it.