Possible Causes

An open in circuits 1397 (GY/WH), 351 (BN/WH), 439 (TN/LB), 298 (VT/OG), 347 (BK/YE), 391 (RD/YE), 883 (PK/LB) or 331 (PK/YE).
PCM.
EATC module.
EMTC module.
A/C cycling switch.
A/C pressure transducer.
A/C compressor clutch field coil.
A/C control relay.
A/C clutch air gap.