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Technical Service Bulletin # Mercedes Benz Truck GL 550 LI32-22_P-053659 Date: 120425

Technical Service Bulletin # Mercedes Benz Truck GL 550 LI32-22_P-053659 Date: 120425

Suspension - Level Control System Restricted Or MIL ON

Level control system function restricted or multifunction display shows an "AIRmatic: Service Required" message

2011 Mercedes Benz Truck GL 550 (164.886) V8-5.5L (273.963) Page 79

Topic number LI32.22-P-053659

Version 1

Design group3 2.22 Air suspension

Date 04-25-2012

Validity BR 164 with AIRmatic (SA 489)

Reason for change

Complaint:

Level control system function restricted (after pressing level control button the vehicle does not rise or lower), or the multifunction display shows an

"AIRmatic Service Required" message

The following fault codes can be stored:

5505 -> Correction times when charging the air suspension are too long.

5508 -> The pressure line system is leaky.

5503 -> Correction time for charging central reservoir is too long.

Cause:

Linkage for level sensor stuck. This results in an incorrect level value being sent to the AIRmatic control unit, which can result in faulty level

control.

Remedy:

Level linkage replacement.

Note:

When the compressor is actuated with XENTRY it may be that the compressor test is failed, because there is no corresponding feedback (level

change) to the AIRmatic control unit. The compressor is not the reason for the fault, and in these instances it must not be replaced!

Symptoms

Control unit/fault code

2011 Mercedes Benz Truck GL 550 (164.886) V8-5.5L (273.963) Page 80