B2449
Diagnostic Trouble Code B2449 - Passenger belt tensioner, resistance too low.�4;:
1. Connect 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 intermittent: Proceed to point 2.
2. The fault is intermittent: Try to expose the fault when taking each reading during fault tracing. Manipulate the connectors and leads while taking the measurements.
Proceed to point 3.
3. Switch off the ignition and disconnect the negative lead from the battery. Undo the bolts securing the steering wheel airbag. Unplug the connector on the back of the airbag. Plug reference resistor 84 71 153 into the connector.
On Cars With A Passenger Airbag
a. Remove the lower cover plate and unplug connector H2-77 to the passenger airbag.
b. Connect reference resistor 84 71 153 to pin connector H2-77 using cable assembly 86 11 378.
Remove the trim from the B-pillar on the passenger side. Unplug the connector on the passenger belt tensioner. Plug reference resistor 84 71 153 into the connector.
Proceed to point 4.
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4. Reconnect the negative battery lead and switch on the ignition. Erase 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. Do extra tests as described in point 5.
5. Switch off the ignition and disconnect the negative lead from the battery. Remove the reference resistor from the belt tensioner connector and connect the belt tensioners. Reconnect 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 lead from the battery and change the belt tensioner. Then proceed to point 7.
If the diagnostic trouble code is gone: The fault is intermittent. Return to point 2.
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6. Switch off the ignition and remove the reference resistor from the belt tensioner connector. Free the SRS control module. Unplug the connector from the SRS control module and plug a BOB into the cable assembly.
Connect an ohmmeter between contacts 3 and 4 on the BOB.
The ohmmeter should show infinite resistance.
If the reading is OK: Proceed to point 7.
If the value is incorrect: If the measurement shows low resistance, there is a short between the two conductors to the belt tensioner. Investigate the cause and change the cable assembly. Then proceed to point 7.
7. Switch off the ignition and disconnect the negative lead from the battery.
Remove reference resistors and plug in all connectors to their original components. Reconnect the battery negative lead and switch on the ignition.
Erase 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.