A/C Request Signal

This signal indicates to the BFC, which relays via Class II to the PCM that an A/C mode is selected at the A/C control head. The PCM uses this information to adjust the idle speed before turning on the A/C clutch. If this signal is not available to the PCM, the A/C compressor will be inoperative.

Refer to A/C Compressor Control Circuit Diagnosis for A/C clutch wiring diagrams and diagnosis of A/C clutch electrical system.