Air Conditioning (A/C) Signal

Air Conditioning (A/C) Signal (Vehicle with A/C only)
This signal is sent from the A/C amplifier.

The A/C amplifier outputs this signal to ECM (PCM) when A/C ON conditions are satisfied on the A/C amplifier side. (The air conditioning does not turn ON in this state.) When ECM (PCM) detects through the A/C signal that A/C ON conditions are satisfied on the A/C amplifier side, it uses the A/C signal as one of the factors to output A/C ON signal and to control IAC valve and fuel injection respectively.