|
Checking auxiliary signals
Checking wiring for crash signal
The engine control unit receives the crash signal ("Crash cut-off was activated") from the airbag control unit.
The airbag control unit sends the crash signal to the engine control unit (during an accident or if a final control diagnosis is carried out relating to the airbag system), the engine control unit switches off the fuel pump, which stops the engine. It can however be restarted (e.g. to move vehicle out of danger area)
-
‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit; do not connect the engine control unit .
-
‒ Check for open circuit and short to positive or earth in the following wiring connections:
|
Test box
V.A.G 1598/31
Socket
|
Control unit for
Airbag -J234
Contact
|
|
67
|
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
|
-
‒ Rectify any open/short circuit as necessary.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
If no wiring fault is detected:
-
‒ Interrogate fault memory of airbag control unit:
=> Body, Self-diagnosis; Repair group 01; Self-diagnosis of airbag system BTU (Basic Triggering Unit) with side airbag; Interrogating fault memory
| 
