Symptom A Shanghai Passat B5 sedan, in the course of the use of such a fault phenomenon: oil pressure warning lights and airbag fault lights alarm, while the engine tachometer can not run.
    Fault check first connect the fault diagnosis VAG1552 into the engine electronic control system query fault memory, found two occasional fault: 18044P1635035-airbag control unit no signal output; 18048P1650035-instrument data output error: the two fault code to clear After exiting the engine electronic control system unit, enter the address word 17 into the instrument system. Select 02 function to query the fault memory, V.A.G1551 display two fault codes: 01314049- engine control unit not communicating: 01321049- to airbag without communication. The initial judgment for the instrument system failure, because the Shanghai public demand table can not be broken, so replace a meter assembly, but no results.
    Then according to the circuit diagram for line inspection, but the relevant resistance and supply voltage are normal, did not find any place where the line wear situation. At this time to consider whether the failure of the car for a number of separate fault coincidence? But in turn check the oil pressure switch, engine tachometer were not found problems. Can be in accordance with the car airbag control system failure prompted to control the computer to replace the test, but there have been unexpected surprises, the car instrument returned to normal.