Electrical Check

Four-wheel pneumatic system, electrical check
^ It is necessary in vehicles in which the On Board Diagnostic (OBD) system does not provide any clues to the source of the malfunction to perform the complete electrical test.
^ In vehicles in which the On Board Diagnostic (OBD) system provides a direct clue to the source of the malfunction, only the test steps recommended in the DTC table need to be performed (systematic starting-point).

Test preconditions
^ Ensure correct multiple connection between the wiring harness and control module -J197- and the double plug-type connection, i.e., check whether any contacts are bent, broken or corroded. Any damaged contacts must be repaired using wiring harness repair set VAS 1978.
^ Before starting testing, switch off the ignition and electrical loads such as the headlights, interior lighting, fans, etc.
^ Only use suitable tools, etc., from VAG 1594 for creating contact.

The following measuring and other equipment is needed:
^ Adapter Set VAG 1594
^ Hand-held multimeter VAG1526
^ Test Box VAG1598/35 with Y cable for connection to wiring harness and self leveling suspension system J197