FB8 Checking Wiring Harness (Circuit 422)

^ Turn air suspension switch to OFF position.

^ Disconnect air suspension control module connector.

^ Using an analog ohmmeter, (20,000 ohms per volt is recommended) connect one lead to air suspension control module wiring harness connector Pin 27 (Circuit 422) and other to circuit 422 of left front height sensor vehicle wiring harness connector.

^ Is ohmmeter reading less than 5 ohms?

YES -- TURN air suspension switch to OFF position. REPLACE air suspension control module. RECONNECT left front height sensor. REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes

NO -- Left front height sensor channel 'A" Circuit 422 resistance is above acceptable limits. RECONNECT left front height sensor and REPEAT Service Bay Diagnostics after service is made.