B2446
Diagnostic trouble code B2446 - Passenger belt tensioner, interruption.X�5:
1. Connect the ISAT Note the diagnostic trouble code and the type of fault. P=permanent fault, I=intermittent fault.
If the fault is permanent: Proceed to point 3.
If the fault is intermiffent: Proceed to point 2.
2. The fault is intermittent. Try to provoke the fault when taking measurements during fault diagnosis.
Manipulate connectors and leads while taking measurements.
Proceed to point 3.
3. Switch off the ignition and disconnect the negative battery lead. Undo the bolts securing the steering wheel airbag. Unplug the connector on the rear of the airbag and connect reference resistor 84 71 153 to the connector.
On Cars With Passenger Airbag:
a. Remove the glove compartment and unplug the connector on the underside of the passenger airbag.
b. Plug in reference resistor 84 71 153 to the connector.
Remove the B pillar trim on the passenger side. Unplug the connector from the passenger side belt tensioner. Connect reference resistor 84 71 153 to the connector.
Proceed to point 4.
�(6:
4. Refit the negative battery lead and switch on the ignition. Erase the diagnostic trouble code. Switch off the ignition and switch it back on again. Wait for at least 10 seconds with the ignition on.
Check to see if the diagnostic trouble code returns.
If the diagnostic trouble code returns: Proceed to point 6.
If the diagnostic trouble code does not return:
The fault is in the belt tensioner. Conduct extra tests as described in point 5.
5. Switch off the ignition and remove the negative battery lead. Remove the reference resistor from the belt tensioner connector and plug in the belt tensioner.
Refit the negative battery lead and switch on the ignition. Wait for at least 10 seconds with the ignition on.
Check to see if the diagnostic trouble code returns.
If the diagnostic trouble code returns: Switch off the ignition, remove the negative battery lead and change the belt tensioner. Then proceed to point 10.
If the diagnostic trouble code is gone: Switch off the ignition and remove the negative battery lead. Refit the reference resistor to the belt tensioner connector.
Refit the negative battery lead and then proceed to point 6.
Vi6:
6. Switch off the ignition and unplug the SRS control module connector. Check pins 3 and 4 for breaks and bad connections. Plug in the connector to the SRS control module and switch on the ignition.
Erase the diagnostic trouble code. Switch off the ignition and switch it back on again. Wait for at least 10 seconds.
Check to see if the diagnostic trouble code returns.
If the diagnostic trouble code returns: Proceed to point 7.
If the diagnostic trouble code does not return: The fault was in the SRS connector.
Proceed to point 10.
NOTE: If no fault was detected in the connector, the fault may be intermittent. Try to provoke any intermittent fault and see if the SRS lamp lights.
7. Switch off the ignition. Unplug the SRS control module connector and connect a BOB to the cable assembly. Connect an ohmmeter between contacts 3 and 4 on the BOB. The ohmmeter should show 2 to 3 ohms.
If the value is OK: Proceed to point 10.
If the value is incorrect: Proceed to point 8.
�6:
8. Unplug the 4 pin connector located on the floor tunnel under the carpet, about 20 cm in front of the SRS control module. Check the pins for breaks and bad connections.
Measure the resistance in the cable assembly between the SRS control module and the 4 pin connector:
Connect an ohmmeter between contact 3 on the BOB and sleeve 3 in the connector.
Connect an ohmmeter between contact 4 on the BOB and sleeve 4 in the connector.
The ohmmeter should show less than 1 ohm.
If the value is OK: Proceed to point 9.
If the value is incorrect: If the measurement shows a high resistance, there is a break in the cable assembly between the 4 pin connector and the SRS control module connector.
Investigate the cause and remedy the fault. Then proceed to point 10.
D�6:
9. Measure the resistance in the cable assembly between the belt tensioner and the 4 pin connector:
Connect an ohmmeter between pins 3 and 4 in the male part of the 4 pin connector.
The ohmmeter should show 2 to 3 ohms.
If the value is OK: Proceed to point 10.
If the value is incorrect: If the measurement shows a high resistance, there is a break in the cable assembly between the 4 pin connector and the belt tensioner connector. Investigate the cause and remedy the fault.
Then proceed to point 10.
10. Switch off the ignition and remove the negative battery lead.
Remove the reference resistors and plug in all connectors to their original components. Refit the negative battery lead and switch on the ignition.
Erase the diagnostic trouble code. Switch off the ignition and switch it back on again. Wait for at least 10 seconds with the ignition on. Check to see if the diagnostic trouble code returns.
If the diagnostic trouble code returns: Description of On-Board Diagnostics
If the diagnostic trouble code does not return: Return the car to good order