Preparation for Test 1. Ignition: ON 2. Set temperature selection to (press and simultaneously). 3. Press . 4. Press for more than 6 seconds. 5. The display will alternately show the number and the in-car temperature (e.g. ),or " " if there is an open circuit, " " if there is a short circuit. 6. By pressing the (ascending numbers) or (descending numbers) the next test step is displayed (see table). 7. Press to end test program.

Display code in N22 window	Possible cause	Test step/Remedy 1)
	In-car temperature sensor with aspirator blower (B10/4)	23 4.0
	Outside temperature sensor (B10/5)	23 5.0
	Heater core temperature sensor (B10/1)	23 7.0
	Evaporator temperature sensor (B10/6)	23 6.0
	ECT sensor (B10/8), e.g. corresponds to 125 oC	23 8.0
	Refrigerant pressure in bar, e.g. corresponds to 12.8 bar	23 9.0
	Blower control voltage, e.g. corresponds to 1.65 V	23 16.0
	Software status of A/C pushbutton control module, e.g.	-
	Selected in-car temperature	-
	Version code	Reading and programming of version code 14
	Engine speed, e.g. corresponds to 600 - 7000 rpm	23 27.0
	A/C compressor speed, e.g. corresponds to 0 - 8400 rpm	23 17.0
	Vehicle speed (km/h)	DM, Chassis and Drivetrain, Vol. 2, Section 5.3 (ASR) DM, Chassis and Drivetrain, Vol. 2, Section 6.3 (ABS)
	not used	-
	Number of current slip recognitions (poly-V-belt)	23 17.0
	Number of stored slip recognitions (poly-V-belt)	23 17.0

1) Observe Preparation for Test, see 22 .

Note: Observe Preparation for Function Test, see 11

	Possible cause	Test step/Remedy 1)
	In-car temperature sensor with aspirator blower (B10/4)	23 4.0
	Outside temperature sensor (B10/5)	23 5.0
	Heater core temperature sensor (B10/1)	23 7.0
	Evaporator temperature sensor (B10/6)	23 6.0
	ECT sensor (B10/8)	23 8.0
	Refrigerant pressure in bar	23 9.0
	Engine speed	23 27.0
	A/C compressor speed	23 17.0
	Vehicle speed (km/h)	DM, Chassis and Drivetrain, Vol. 2, Section 5.3 (ASR) DM, Chassis and Drivetrain, Vol. 2, Section 6.3 (ABS)

1) Observe Preparation for Test, see 22 .