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Self-diagnosis for the interior monitoring system
Description of the interior monitoring system
The interior monitoring system is an independent system. It consists of one sender and one receiver.
The interior sensors work on the ultrasonic wave principle. The alarm of the anti-theft alarm system will be triggered if movement is detected in the interior when the system is active.
The interior sensors can be switched off via a switch in the B pillar/door sill. To do this the ignition must be switched off and ignition key must be withdrawn from the ignition switch, then operate switch and lock the vehicle.
The sensors will be switched on again the next time the vehicle is unlocked.
A waiting time of at least 30 seconds must be observed before commencing tests when the vehicle is locked.
The control unit for the interior monitoring system (J393) is integrated in the sensor unit and installed in the roof trim above the B pillar. The control unit is equipped with a fault memory. The self-diagnosis connection is located in the centre console.
The control unit recognizes faults and malfunctions in the interior monitoring system and stores them in a non-volatile memory.
Testers V.A.G 1551 and 1552 can be used to interrogate the fault memories and code the control units as well as the function self-diagnosis of the VAS 5051.
The fault information displayed is used to refer to a fault table with notes on the possible causes for directed repair measures.
Faults which can be attributed to a temporary open circuit in the wiring or a loose contact, will also be stored. These faults will be displayed as sporadic faults "SP".
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