The picture below provides Air Conditioning Compressor Signal (A/C) and Electrical Load Signal (ELS) Circuit Diagram for particularly Toyota
cars. The A/C signal used to determine when the air conditioning compressor is
loading the engine.
The ELS circuit signals electrical load on the charging system so that the
ECU uses the information needed for maintaining a stable idle speed.
(source: http://www.hqew.net/circuit-diagram)
Trying to work out if A/C compressor is dead or wiring harness is dead - or fuse - and how to force a 12V signal to the A/C clutch/drive compressor to get it to start circulating so I can fill up with the R134a refrigerant
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AC Compressor