IECU Electric Cirucit From battery relay From battery F1 10A F16 15A 21C6 KEY ON 21C5 (CLOCK) W/TEMP FUEL LCD DISPLAY (MCD) CENTRAL WARNING COOLANT CLEANER CHARGE HAMMER PARK BRAKE BRAKE FAIL STEER PRESS. AXLE LOCK ALIGNE HIGH BEAM LH/RH TURN E/OIL PRESS COOL TEMP LEVEL AIR PRE HEAT HYD TEMP HYD FILTER QUICK FIT OVER LOAD POWER BOOST BOOM FLOAT SHEAR IECU (ILLU.LAMP) 21C9 VECU STATUS VECU JB16 Auto/Manual SW position From work lamp switch 1 5 6 10 H JA34 L A B TO VECU Volvo Construction Equipment Customer Support UPDATE - EC160B~460B - 07 21C1 (J1939 H) 21C2 (J1939 L) 21C3 (J1587 A) 21C4 (J1587 B) 21C8 21C10 21C7