Antitheft and Alarm Systems: Service Precautions

Safety precautions
If special testing equipment is required during road test, note the following:


WARNING!
- To reduce the risk of accident during road tests, always proceed as follows:
- Only the VAS 5051 may be used For reading out measuring value blocks. Always secure scan tool to the rear seat and have operated from there by a second technician.


To reduce the risk of personal injury and/or damage of electric and electronic components, always observe the following:
- Always switch ignition off before connecting or disconnecting test/measurement tools.
- It is possible that the control module will recognize a malfunction and store a DTC during some tests. After completing all tests and repairs, DTC memory should therefore be checked and erased if necessary.
- Always switch ignition off before disconnecting or connecting battery. Failure to do so may damage electronic control modules.