Actual values (functional condition) Door contact switches Alarm contacts Anti-tow protection Engine hood switch (S62) Stop lamp switch (S9/1) Menu driven via HHT Four displays are possible: , , , . Contrary to DTC memory, actual values are updated continuously, even during diagnosis. This allows intermittent faults to be recognized by moving/shaking components, connectors or wiring harnesses. Activation The following components can be activated: Switch illumination Alarm Horn (H3) or Alarm siren with auxiliary battery (H3/1) Headlamps/taillamps (only ) Blinker system Menu driven via HHT.