IC9 Wiring Harness Check (Air Compressor Relay)

^ Remove air compressor relay from its vehicle wiring harness connector.

^ Does air compressor stop running and remain off?

YES -- INSTALL new air compressor relay and REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes

NO -- SERVICE short to B+ in Circuit 417 which is causing air compressor to run until air compressor's internal thermal circuit breaker is tripped. REPEAT Service Bay Diagnostics after service is made and air compressor relay has been installed again.