HD8 Checking Wiring Harness (Circuit 421)

^ Using an analog ohmmeter, connect one lead to air suspension control module wiring harness connector Pin 42 (Circuit 421) and other to air compressor assembly vehicle wiring harness connector Circuit 421.

^ Is ohmmeter reading greater than 10 ohms?

YES -- SERVICE open in Circuit 421. REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes

NO -- GO to HD9.