Checking adjustment of level sender on rear axle — VW

Note:

The vehicle level sender on the rear axle is not adjustable. A check of the prescribed specifications is possible and this is described in the following.

The following prerequisites must be adhered to when checking the level sender on the rear axle:

Vehicle must be standing on all four wheels on a flat level surface.
The handbrake must not be applied and a gear must not be engaged/selected.
The steering must be in the straight-ahead position.
No person may be in the vehicle and the vehicle may not be loaded.
The vehicle must not be moved during the basic settings (do not open/close a door, lean on the vehicle, enter or exit the vehicle).
If the vehicle was on a lift/ramp/hoist etc. prior to making adjustments then the suspension springs must settled by rolling the vehicle back and forth a few metres.

Special tools, testers, measuring instruments and auxiliary items required

Fault reader V.A.G 1551 or vehicle systems tester V.A.G 1552

V.A.G 1551/3B Cable

Connecting fault reader V.A.G 1551 and selecting functions (Interrogating unit version)

Check prerequisites:

All fuses according to current flow diagram OK.
Supply voltage OK. (at least 9.0 V).

Connect fault reader V.A.G 1551 (V.A.G 1552) with cable V.A.G 1551/3B.

V.A.G SELF-DIAGNOSIS
HELP
1 - Rapid data transfer*
2 - Flash code output*
Indicated on display:

* Appears alternately

Notes:

If the display remains blank, check V.A.G 1551 voltage supply referring to current flow diagram.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Additional operating instructions can be called up with the fault reader HELP key.
The ⇒ key serves to advance the program sequence.
In operating mode 1 "Rapid data transfer" the function 00 "Automatic test sequence" can be carried out. Then all the control units in the vehicle will be interrogated automatically.

Switch on ignition.
Switch on printer with the Print key (indicator lamp in key lights up).
Press key 1 for "Rapid data transfer" mode.

Rapid data transfer
HELP
Enter address word XX
Indicated on display:

Press keys 2 and 9. "29" enters address word "Left lighting control".

Rapid data transfer
Q
29 Left lighting control
Indicated on display:

Confirm entry with Q key.

Rapid data transfer
Q
Tester sends address word 29
Indicated on display:

Interrogate control unit version

9C3907391
EVG GDL + Auto HRC
0001
⇒
Coding 00006
WSC 00000
Indicated on display:

Upper line
Part No. of control unit1),
system designation
(headlight range control),
Version number1)
Lower line
Code number2)
Dealership number

1)- The part and version numbers can deviated from the examples shown here e.g. changes to part numbers etc.

2)-Dependent on type of drive.

⇒ Press key.

Rapid data transfer
HELP
Select function XX
Indicated on display:

Press keys -0- and -8- (08 initiates function "Read measured value block").

Rapid data transfer
Q
08 - Read measured value block
Indicated on display:

Confirm entry with Q key.

Read measured value (data) block
Input display group number XXX
Indicated on display:

Press keys 0 twice and key 2 once.
Confirm entry with Q key.

Read measured value block
2
⇒
2.1
2.4
ADP OK.
Indicated on display, e.g.:

The specifications for the vehicle level sender on the rear axle must lie between 2.0 - 3.5 Volt in display zone 2 of measured value block.

Note:

If the Voltage figures lie outside the specified tolerances, check following points:

If vehicle level sender is secured tight in its holder.
If sender coupling rod is bent/deformed.
If electrical connections are fitted correctly and locked in position.

If no faults can be found here, continue with fault finding using self-diagnosis of headlight range control.

=> Electrical system self-diagnosis; Repair group 01; Self-diagnosis; Self-diagnosis of automatic headlight range control
Electrical system self-diagnosis
Self-diagnosis
Self-diagnosis of automatic headlight range control

⇒ Press key.

Rapid data transfer
HELP
Select function XX
Indicated on display:

Press keys 0 and 6. (06 selects function "End output").

Rapid data transfer
Q
06 End output
Indicated on display:

Confirm entry with Q key.

Rapid data transfer
Help
Enter address word XX
Indicated on display:

Once the check of the coupling rod settings has been completed, the electronic components must be adapted/zeroed to the new settings. To do this, perform basic settings of automatic headlight range control.