LI8330P0496447

No cooling output, fault code 9006 in air conditioning control unit
Topic number
LI83.30-P-049644
Version
7
Design group
83.30 Air conditioning
Date
11-15-2016
Validity
All veh. of model series 164/251
Reason for change
Damage code adjusted
Reason for block
Complaint:
No cooling output, fault code (FC) 9006 stored in air conditioning (AAC) control unit.
Cause:
- Poor system ground at ground point W29/2
- Software in AAC control unit
- Poor ground at refrigerant compressor
Remedy:
1. Check ground point W29/2 (A-pillar, see WIS documents in attachment for details) and repair if necessary.
-> Optimize contact, tightening torque: 9 Nm
2. Check crimping of ground line of AAC control unit at ground point W29/2 and repair if necessary.
In vehicles produced prior to 04/2010:
3. Flash AAC control unit with flashware (FW) 2519021300 using Star Diagnosis.
Then perform the following test on the vehicle:
4. Perform the Star Diagnosis tests stored after fault code 9006, including the test of the refrigerant compressor.
5. Check ground line between AAC control unit and ground point W29/2 for open circuit and repair if necessary.
6. Check positive line between AAC control unit and refrigerant compressor for open circuit and repair if necessary.
In vehicles up to code 808 (YoM 07/1) :
7. From the connection of the regulation valve on the refrigerant compressor one cable with a cable lug is bolted onto
the housing of the refrigerant compressor as a ground line; the other cable goes via the connector to the engine wiring
harness. An additional ground line with a cross section of 0.75 mm² must be properly routed from the bolt-on point of
the ground cable on the housing of the refrigerant compressor to ground point W16/4 in the front right of the engine
compartment below the engine hood hinge (see photos in attachment).
11-15-2016 4:58 PM
© Copyright Daimler AG
BRABENS
Page 1/3
In vehicles as of code 808 (YoM 07/1) :
8. Convert electrical line on refrigerant compressor from 1-pin to 2-pin. (Part number of 2-pin wiring harness
A1644406641) When connecting the 2-pin wiring harness, ensure correct polarity otherwise the regulation valve will
be irreparably damaged. The regulation valve is thus grounded via the operating unit.
Replacing the refrigerant compressor and the A/C operating unit does not remedy the problem in this case.
Attachments
File
Description
Massepunkt W16-4.jpg
Ground point W16/4
Symptoms
Body / Air conditioning / Air conditioning / Insufficient cooling output
Body / Air conditioning / Air conditioning / Temperature differences
Body / Air conditioning / Air conditioning / Windows fogged
Body / Air conditioning / Air conditioning / Temperature control not sensitive enough
Control unit/fault code
Control unit
Fault code
Fault text
AAC-Automatic air conditioning (KLA8)
9006
Component A9 (AC compressor) has Short circuit.
Parts
Part number
ES1 ES2 Designation
A 164 440 66 41
Quantity Note
Electrical wiring harness
1
EPC
In vehicles as of code 808 (YoM 07/
1)
X
Operation numbers/damage codes
Op. no.
Operation text
Time
Damage
code
Note
6304B 38
Interior compartment ground point,
loose
83405 90
Automatic air conditioning operating
unit, software release
83421 74
A/C compressor ground
WIS-References
Document number
Title
GF00.19-P-2000MAA
Location and assignment of Model series 164
ground points
11-15-2016 4:58 PM
© Copyright Daimler AG
Note
BRABENS
Allocation
Remedy
Page 2/3
GF00.19-P-2000RAA
Location and assignment of Model series 251
ground points
Remedy
Attachments
Massepunkt W16-4.jpg:
11-15-2016 4:58 PM
© Copyright Daimler AG
BRABENS
Page 3/3