FC4 Checking Wiring Harness (Circuit 431B)

FC4 CHECKING WIRING HARNESS (CIRCUIT 431B)

^ Turn air suspension switch to OFF position.

^ Disconnect air suspension control module connector.

^ Using an ohmmeter, connect one lead to air suspension control module wiring harness connector Pin 22 (Circuit 431B) and other to Circuit 431 of rear 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 the rear height sensor. REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes

NO -- Rear height sensor power supply Circuit 431B/431 resistance is above acceptable limits. RECONNECT rear height sensor and REPEAT Service Bay Diagnostics after service is made.