Headlamp Alignment Sensor: Testing and Inspection
Left Rear Level Control System Sensor, Checking
NOTE: The rear level control system sensor is not externally adjustable. However, it must be checked after installation is complete.
Special tools, testers and auxiliary items required
- Scan Tool VAG 1551 / VAG 1552 (ST) or Vehicle Diagnostic Testing and Information System VAS 5051 / VAS5052.
- Adapter Cable VAG 1551/3B
Prerequisites
- Vehicle must be standing on all four wheels on a flat level surface.
- Handbrake lever must be in off position and a drive gear must not be selected.
- Steering must be in straight-ahead position.
- Vehicle must be unoccupied and not loaded.
- Vehicle must not be moved during basic settings process ( i.e.: opening and closing of doors, people leaning on vehicle, people entering vehicle is not permitted).
- If vehicle was raised using a lifting platform/hoist or a vehicle/workshop jack, then it must be rolled back and forth several times so that the springs etc. settle, before starting adjustments.
Vehicle Diagnostic Testing and Information System VAS5051/VAS 5052, Selecting Functions
Scan Tool VAG 1551/VAG 1552, Connecting and Selecting Functions (Function 01)
Prerequisites:
- All fuses OK., according to wiring diagram
- Voltage supply OK. (minimum 9.0 V).
- Connect Scan Tool (ST) using Adapter Cable VAG 1551/3B.
Indicated on display: anm3522885941143-s1
VAG- SELF-DIAGNOSIS HELP
1 - Rapid data transfer*
Indicated on display: anm3522885941143-s1
VAG- SELF-DIAGNOSIS HELP
2 - Flash code output*
NOTE:
- If display remains blank, check Scan Tool VAG 1551 / VAG1552 voltage supply according to wiring diagram.
- Additional operating instructions can be called up with the scan tool HELP key.
- The arrowright key advances the program sequence.
- In operating mode 1 "Rapid data transfer" function 00 "Automatic test sequence" can be carried out. The DTC memory of all vehicle control units is checked automatically with function 00..
- Switch ignition on.
- Switch printer on with the Print key (warning lamp in the key will light up).
- Press key 1 for "Rapid data transfer" operating mode.
Indicated on display
Rapid data transfer HELP
Enter address word XX
- Press keys 2 and 9 to select "Light control, left" address word "29".
Indicated on display:
Rapid data transfer Q
29 Light control, left
- Press Q button to confirm input.
Indicated on display:
Rapid data transfer Q
Tester sends address word 29
Control Module Version, Checking
Indicated on display
7M3907391 EVG GDL + Auto HRC 0001->
Coding 00006 WSC 00000
Upper line:
- Part No. of control module anm3522885941146-1b
- System designation (headlamp range control)
- Version number anm3522885941146-1b
Bottom line:
- Coding number anm3522885941146-2b
- Dealership number
Part and version numbers illustrated here are examples only
Dependant on type of drive
- Press arrowright key.
Indicated on display:
Rapid data transfer HELP
Select function XX
- Press keys 0 and 8 to select "Read measuring value block" address word 08.
Indicated on display:
Rapid data transfer Q
08 - Read measuring value block
- Press Q button to confirm input.
Indicated on display:
Read measured value block
Enter display group number XXX
- Press key 0 twice and press key 2 once to select display group number 002.
- Press Q button to confirm input.
Indicated on display e.g.:
Read measuring value block 2 ->
2.1 2.4 ADP. O.K.
Specification for rear level control system sensor, shown in display zone 2, must lie between 2.0 - 3.5 Volt.
NOTE:
- If voltage is outside specified tolerances, then check for the following:
- sensor is not loose in its mounting.
- sensor coupling rod is not bent.
- electrical connections are correctly connected, free from corrosion and are locked in position.
If malfunctions cannot be located in the above items, then perform troubleshooting using the Automatic Headlamp Range Control On Board Diagnostic (OBD) program.
- Press arrowright key.
Indicated on display:
Rapid data transfer HELP
Select function XX
- Press keys 0 and 6 to select "End output" function 06.
Indicated on display :
Rapid data transfer Q
06 End output
- Press Q button to confirm input.
Indicated on display :
Rapid data transfer Help
Enter address word XX
After checking the adjustment of the coupling rod, the related electrical components must adjusted to the revised settings. Perform basic settings of the automatic headlamp range control to adjust to the revised settings.