1) Disconnect the connector from the A/C control module.
2) Check the harness between A/C control module and compressor speed sensor.
Connector & terminal
(F24) No. 3 — (i88) No. 38:
(F24) No. 2 — (i88) No. 14:
Is there any open or power supply-output short, GND-output short in harness?
Replace the A/C control module.
Repaiar the harness between A/C control module and compressor speed sensor.