Crash Signal Wiring, Testing

Crash Signal, Checking

The Engine Control Module (ECM) receives the crash signal ("Crash shut-off was triggered") from the airbag control module.

When the airbag control module sends the crash signal to the ECM (during an accident or when output DTM is being performed for the airbag system), the ECM switches the Fuel Pump (FP) off. This means that the engine will stop running but can be started again afterward (e.g. to remove vehicle from danger).

When the DTC "Crash-signal from airbag control module, implausible signal" is stored, the ECM cannot switch off the Fuel Pump (FP) during an accident involving airbag deployment, because the ECM cannot recognized the crash signal from the airbag control module, e.g. due to a wiring problem between ECM and airbag control module.

- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Wiring and Component Testing Using VAG1598/31 Test Box

The following wire connections must be checked for short circuit to B+, Ground (GND) and for open circuit
- VAG1598/31 test box, socket - 67 (Airbag control module)
- Wire resistance: max: 1.5 Ohm

- Repair open circuit or short circuit if necessary.

If no malfunctions are found in wire: Check DTC Memory of airbag control module.