Function of individual components
- Control module
The control module is installed on the passenger's side below the passenger's airbag unit. If the control module is replaced, the following points must be observed:
- Coding of the vehicle type
- Calibration of the control module
- Adjustment of the headlights
If a new control module is installed, fault codes "6 Control unit coding error" and "7 Calibration not performed yet" are stored.
Remedy:
Start the automatic control module search and code the vehicle type. Then perform a calibration and then erase the fault memory. Adjust the headlights after calibration.
- Main light switch
The HBA system is activated when the parking light is switched on (terminal 58). The headlights are set to high-beam position when the high-beam switch is operated.
- Angle sensor for HBA, rear
The sensor is fastened on the left side of the rear axle and is connected to the lower axle strut by a linkage.
A sensor measures the compression travel and forwards this value as a sensor voltage to the control module.
- Angle sensor for HBA, front
The sensor is fastened on the left side of the front axle and is connected to the axle strut by a linkage. A sensor measures the compression travel and forwards this value as a sensor voltage to the control module.
NOTE: When making repairs, bear in mind that the angle sensor bracket (B) must be in contact at the bottom when the bolts on the rear-axle support (A) are tightened (arrow). See Fig 1 . Once installed, the control module must be calibrated with the Porsche System Tester 2. Adjust the headlights after calibration. - Headlights
Each headlight includes a stepper (servomotor for HBA) which is activated by the control module. Fig 2 shows the connections for the respective servomotor.
Headlight without lens