Crackling and static noises from the speakers when radio is on - AF82.62-P-1009AG

MODEL 211 with CODE (523) Radio MB Audio 20

MODEL 211 with CODE (525) MB Audio 50 APS radio

MODEL 211 with CODE (526) COMAND (without navigation)

MODEL 211 with CODE (527) COMAND APS (with navigation)

MODIFICATION NOTES

24.11.04

Lacquered mount replaced by galvanized mount

OPERATION NO. OF OPERATION TEXTS OR STANDARD TEXTS AND FLAT RATES

Category	Op. no.	Operation text	Time	Acc. no.	Code
P	827479	Replace audio gateway control unit (after testing), MODEL 211.0	013 WU	-	-
P	827479	Replace audio gateway control unit (after testing), MODEL 211.2	006 WU	-	-

Damage code	Cause	Remedy
82 669 36	Bad contact to ground in audio gateway (AGW).	Do not replace the AGW!
	The resulting problem with the electromagnetic compatibility can lead to crackling/static noises when Audio 20, Audio 50 or COMAND are in radio mode.	Ground connection of AGW housing to Ka, for this purpose: ↓ 1 Unplug connector 2 (voltage supply and ground).
		2 Measure the resistance between the AGW's housing and the vehicle's frame. The resistance measured with a multimeter must be less than 0.5 Ω. If the resistance is greater than 0.5 Ω, the paint layer on the mounting frame of the AGW and on the paneling where the supporting frame is attached to the body acts as an insulation. In this case: ↓
		3 Remove AGW.
		Model 211.0	AR82.60-P-7605T
		Model 211.2	AR82.60-P-7605TA
		4 Replace AGW mount (installation frame) Use galvanized AGW mount according to parts ordering note.
		5 Install AGW.
		Model 211.0	AR82.60-P-7605T
		Model 211.2	AR82.60-P-7605TA
		6 Check the ground connection of the AGW's housing to the vehicle's frame. Resistance must be less than 0.5 Ω.

PARTS ORDERING NOTES

Part no.	Designation	Quantity
A 211 545 86 40	AGW mount (installation frame), galvanized, model 211.2	1
A 211 545 87 40	AGW mount (installation frame), galvanized, model 211.0	1