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Testing auxiliary signals
Testing crash signal wiring
The crash signal ("Crash switch-off triggered") is transmitted to the engine control unit by the airbag control unit.
If the airbag control unit transmits the crash signal to the engine control unit (in case of an accident or if a final control diagnosis for the airbag system is carried out), the engine control unit switches off the fuel pump. The engine stops but can be restarted immediately (e.g. to move the vehicle out of the danger zone).
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‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
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‒ Test for open circuit and short to positive or earth in the following wiring connection:
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Test box
V.A.G 1598/31
Socket
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Airbag control unit -J234
Contact
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67
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=> Current flow diagrams,
=> Electrical fault-finding
=> and Fitting locations binder
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‒ Rectify short circuit or open circuit if necessary.
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
If no wiring fault is detected:
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‒ Interrogate fault memory of airbag control unit:
=> Body, Self-diagnosis; Repair group 01
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