ACC and HVAC - Revision history

Pokseva: /* Outside Temperature Sensor (B14) */ refactored

2026-08-07T13:21:02Z

Outside Temperature Sensor (B14): refactored

@@ Line 350: / Line 350: @@
   Start value: 116 which reduced to 114.
   Conclusion: Result is inconclusive.
-=Outside Temperature Sensor (B14)=
+=Outside (Ambient) Temperature Sensor (B14)=
-[[File:W220_2003_ACC_Outside_Temperature_Sensor_%28B14%29.JPG|300px|center]]
+The outside (ambient) temperature sensor B14 is located in the small left-front air intake below the front bumper, mounted in the left bumper grille.
 {|
@@ Line 363: / Line 374: @@
 |[[File:W220_temperature_sensor_bumper_hole.jpg|thumb|none|Sensor hole in the left bumper grille ([[facelift]]).]]
 |}
 =R134A Refrigerant Temperature Sensor (B12/1)=

2026-05-30T11:23:47Z

← Older revision	Revision as of 11:23, 30 May 2026
(No difference)

2021-07-20T14:31:19Z

Test Results - R134A Refrigerant Temperature Sensor (B12/1)

← Older revision		Revision as of 14:31, 20 July 2021
Line 385:		Line 385:

	Sensitivity of sensor seems OK.		Sensitivity of sensor seems OK.

			=Resistance Specification - In Cabin Air Temperature Sensor (N22/b1)=
			The resistance specification for the In Cabin Air Temperature Sensor (N22/b1) is presumed to be the same as [[In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Overhead Control Panel (OCP) (N70)]].

2021-07-20T14:24:41Z

Test Results - Outside Temperature Sensor (B14)

← Older revision		Revision as of 14:24, 20 July 2021
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	'''Conclusion:'''		'''Conclusion:'''
	Sensitivity of sensor seems OK.		Sensitivity of sensor seems OK.

			=R134A Refrigerant Temperature Sensor (B12/1)=

			==Testing - R134A Refrigerant Temperature Sensor (B12/1)==

			Monitor Diagnostic Parameter NR.08: and apply direct heat using an hair drier to the R134A Refrigerant Temperature Sensor B12/1 (located on top of the air conditioner receiver drier at the front left corner of the engine compartment).

			[[File:W220_2003_ACC_R134A_Refrigerant_Temperature_Sensor_%28B12_1%29.JPG\|300px\|center]]

			==Test Results - R134A Refrigerant Temperature Sensor (B12/1)==

			Start temperature: 23.5ºC which increased to 30.5ºC very slowly due to the mass of metal to be heated.

			'''Conclusion:'''

			Sensitivity of sensor seems OK.

2021-07-20T14:18:57Z

Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing

← Older revision		Revision as of 14:18, 20 July 2021
Line 350:		Line 350:
	Start value: 116 which reduced to 114.		Start value: 116 which reduced to 114.
	Conclusion: Result is inconclusive.		Conclusion: Result is inconclusive.
			=Outside Temperature Sensor (B14)=
			==Testing - Outside Temperature Sensor (B14)==
			* Monitor Diagnostic Parameter NR.02: using the ACC Pushbutton Control Module (N22).
			* Apply direct heat using an hair drier to the Outside Temperature Sensor B14 located in the small left front air scoop below the front bumper).

			[[File:W220_2003_ACC_Outside_Temperature_Sensor_%28B14%29.JPG\|300px\|center]]


			{\|
			\|[[File:W220_temperature_sensor_inside_bumper.jpg\|thumb\|none\|Outside temperature sensor (B14).]]
			\|[[File:W220_temperature_sensor_removed.jpg\|thumb\|none\|Sensor unplugged.]]
			\|[[File:W220_temperature_sensor_bumper_hole.jpg\|thumb\|none\|Sensor hole in the left bumper grille ([[facelift]]).]]
			\|}

			==Test Results - Outside Temperature Sensor (B14)==
			Start temperature: 24.7 ºC which quickly increased to 50.5ºC and then slowly returned to 33.7ºC after the heat was removed. (Note there was no air flow over the Outside Temperature Sensor B14 as the car was stationary.)

			'''Conclusion:'''
			Sensitivity of sensor seems OK.

2021-07-20T14:17:00Z

Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing

← Older revision		Revision as of 14:17, 20 July 2021
Line 341:		Line 341:
	(RH Drive W220) adjacent to the fresh air intake.		(RH Drive W220) adjacent to the fresh air intake.
	http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG		http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG
			==Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing==
			Monitor Diagnostic Parameter NR.17: and breathe heavily on both sensors.
			Start value: 116 which reduced to 114.
			Conclusion: Result is inconclusive.

	==Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing==		==Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing==
	Monitor Diagnostic Parameter NR.17: and breathe heavily on both sensors.		Monitor Diagnostic Parameter NR.17: and breathe heavily on both sensors.
	Start value: 116 which reduced to 114.		Start value: 116 which reduced to 114.
	Conclusion: Result is inconclusive.		Conclusion: Result is inconclusive.

2021-07-20T14:16:29Z

Multi-function Sensor (B31/1) Location and Access

← Older revision		Revision as of 14:16, 20 July 2021
Line 341:		Line 341:
	(RH Drive W220) adjacent to the fresh air intake.		(RH Drive W220) adjacent to the fresh air intake.
	http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG		http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG
			==Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing==
			Monitor Diagnostic Parameter NR.17: and breathe heavily on both sensors.
			Start value: 116 which reduced to 114.
			Conclusion: Result is inconclusive.

2021-07-20T14:15:58Z

Multi-function Sensor (B31/1) Dew Point Temperature Access and Testing

← Older revision		Revision as of 14:15, 20 July 2021
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	Start value: 15.5 ºC which increased to 20.5 ºC.		Start value: 15.5 ºC which increased to 20.5 ºC.
	Conclusion: Sensitivity of sensor seems OK.		Conclusion: Sensitivity of sensor seems OK.
			==Multi-function Sensor (B31/1) Location and Access==
			Remove two screws and gently withdraw the Multi-function Sensor (B31/1) located at right rear corner of engine compartment
			(RH Drive W220) adjacent to the fresh air intake.
			http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG

2021-07-20T14:15:28Z

Multi-function Sensor (B31/1) CO Carbon Monoxide Access and Testing

← Older revision		Revision as of 14:15, 20 July 2021
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	Start value: 683 which reduced to 681.		Start value: 683 which reduced to 681.
	Conclusion: Result is inconclusive.		Conclusion: Result is inconclusive.

			==Multi-function Sensor (B31/1) Dew Point Temperature Access and Testing==
			Monitor Diagnostic Parameter NR.18: and breathe heavily on both sensors.
			Start value: 15.5 ºC which increased to 20.5 ºC.
			Conclusion: Sensitivity of sensor seems OK.

2021-07-20T14:14:53Z

In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Overhead Control Panel (OCP) (N70) Testing

← Older revision		Revision as of 14:14, 20 July 2021
Line 326:		Line 326:

	http://www.benzworld.org/forums/w220-s-class/1460424-need-help-c-diag-new-post.html		http://www.benzworld.org/forums/w220-s-class/1460424-need-help-c-diag-new-post.html


			==Multi-function Sensor (B31/1) CO Carbon Monoxide Access and Testing==
			Monitor Diagnostic Parameter NR.16: and breathe heavily on both sensors.
			Start value: 683 which reduced to 681.
			Conclusion: Result is inconclusive.