Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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lemon-manuals.org.ua
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A/C Signal: Description and Operation
A/C Request Signal This signal tells the
PCM when the A/C mode is selected at the A/C control head. The PCM uses this to adjust the
idle speed before turning
"ON" the A/C clutch. The A/C compressor will be inoperative if this signal is not available to the PCM.
Refer to
Air Conditioning Compressor/Testing and Inspection/A/C Clutch Circuit Diagnosis.