Q: Unable to start car but there are panel lights & alarm indicating key in ignitio on 1990 Acura Legend

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1990 Acura Legend LS (V6)

Furthermore, all interior lights (panel & console excluded) & cig-lighter stopped working maybe 2months ago; there's also been a faint radar-like beeping when engine is started (not always heard & tends to stop after a short time; once it persisted during a 2hr drive). Could it all be related?
(1) Answer
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The cigarette lighter or at least the fuse that protects the illumination of the cigarette lighter is probably blown. Check dash fuse box number 8 20Amps, and fuse 14 a 15 amp fuse.
I doubt if this is your problem. See if you have spark and fuel. If you have no fuel the tach relay/main relay (Honda call it a PGMFI main relay) fail ofter. Have also seen the electrical portion of the ignition switch has failed. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate