On Board Diagnostic (OBD), Function

On Board Diagnostic (OBD), Function

The electronic anti-theft immobilizer has extensive On Board Diagnostic (OBD) capabilities. If malfunctions occur in any of the system components, corresponding Diagnostic Trouble Codes (DTC) are stored in the DTC memory of the anti-theft immobilizer.

Before performing any troubleshooting or inspection, always begin by checking for DTCs using the On Board Diagnostic (OBD) program. DTCs stored in memory are retrieved/checked with VAS 5051 in mode "Self Diagnosis".

Where applicable, also use VAS 5051 tester in mode "Guided Fault Finding".

NOTE: All OBD program functions for anti-theft immobilizer must only be performed using VAS 5051 Vehicle Diagnostic Testing and Information System.

WARNING: Anti-theft immobilizer OBD program functions described here must only be performed on a non-moving vehicle. DO NOT USE VAS 5051 during a road test.

NOTE: The following description refers only to use of VAS 5051 tester.

Notes for use and adaptation of vehicle key
Engine will only start when an authorized vehicle key is used, i.e. on of the keys adapted to the immobilizer.

During adaptation of the vehicle keys, all vehicle keys, including replacement and emergency keys, must always be adapted to the immobilizer.

If new or extra vehicle keys are required, adaptation of all vehicle keys must be performed.

If adaptation cannot be performed for all vehicle keys, e.g. key lost during a trip, the customer must be informed that adaptation must eventually be performed for any and all vehicle keys.

Especially when a key has been lost, all vehicle keys should be re-adapted, since this will render the lost key unauthorized for vehicle start.

Malfunctioning transponder and/or loss of key
- The transponder is integrated into the vehicle key.
- If the transponder is malfunctioning or if a key was lost, the complete vehicle key must be replaced.
- Order the replacement key with integrated transponder according to the lock number.
- Perform adaptation of all vehicle keys