301 Airbag Signal - Signal Implausible

P1265

301 Airbag Signal - Signal Implausible

Function
In the event of an accident in which the airbag is triggered, the fuel pump is switched off by a signal from the airbag control module.

Diagnosis conditions
- Ignition on







Wiring Diagram







Diagnosis Procedure







1 Check wiring from airbag control module to DME control module for continuity.







1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove connector of airbag control module.
3. Connect ohmmeter to special tool 9637, pin IV/16, and airbag connector, pin 24 or 34.

Display: 0 - 5 ohms

If infinity ohms is displayed, check connector X2/5 or check wiring harness for chafing and pinching damage.

2 Check wiring from airbag control module to DME control module for short to ground.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove connector of airbag control module.
3. Connect ohmmeter to special tool 9637, pin IV/16, and ground.

Display: infinity ohms

If 0 - 5 ohms is displayed, check wiring harness for chafing and pinching damage.

3 Check signal from airbag control module.







1. Connect special tool 9637.
2. Connect engine tester (oscilloscope) to pin IV/16 and ground.
Use special input.
3. Ignition on. The signal shown opposite should be displayed: