244000493 - K12 DISPLAY DOES NOT SIGNAL ICE DANGER WITH LOW OUTSIDE TEMPERATURE

The normal messages do not appear on the tachograph display.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	TACHOGRAPH POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check continuity between tachograph control unit connector and battery positive [Wiring Diagram E4025]    See E4025 TACHOGRAPH	Move on to Step	1. Lack of continuity between connector and battery positive	1. Eliminate short circuits and then change fuse [Wiring Diagram E4025]    See E4025 TACHOGRAPH
			2.Control unit supply wiring fault	2. Repair or replace connector/cable [Wiring Diagram E4025]    See E4025 TACHOGRAPH
2	TACHOGRAPH POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check continuity between tachograph control unit and vehicle earth [Wiring Diagram E4025]    See E4025 TACHOGRAPH	Move on to Step	Lack of continuity between tachograph control unit and vehicle earth.	Repair and/or replace connector/cable [Wiring Diagram E4025]    See E4025 TACHOGRAPH
3	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Tachograph control unit fault persists	Replace the tachograph    Op. 5560C22 TACHOGRAPH - R.R.