IC14 Checking Wiring Harness (Circuit 175)

^ Using a voltmeter, connect positive lead to Circuit 175 of the air compressor relay's wiring harness connector and negative lead to Circuit 430S.

^ Is voltage reading greater than 10 volts?

YES -- GO to IC15.

NO -- SERVICE open or short in circuit. There should always be battery voltage on this circuit. REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes