B2442
Diagnostic Trouble Code B2442 / Diagnostic Trouble Code B2447 - Driver belt tensioner / passenger belt tensioner, short to groundI�0:
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 screws 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-pillars. Unplug the connectors on the belt tensioners. Connect reference resistor 84 71 153 to 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 7.
If the diagnostic trouble code does not return: The fault is in the driver or passenger belt tensioner. Conduct 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 on the driver side and connect the belt tensioner.
Refit the negative lead to the battery 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 driver belt tensioner. Then proceed to point 8.
If the diagnostic trouble code does not return: The fault is in the belt tensioner on the passenger side. Conduct extra tests as described in point 6.
6. Switch off the ignition and disconnect the negative lead from the battery. Refit the reference resistor on the driver belt tensioner connector.
Remove the reference resistor from the belt tensioner connector on the passenger side and reconnect the belt tensioner.
Refit the negative lead to the battery 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 passenger belt tensioner. Then proceed to point 8.
If the diagnostic trouble code does not return: The fault is intermittent. Return to point 2.
7. Switch off the ignition and remove the reference resistors from the two belt tensioner connectors. Free the SRS control module. Unplug the SRS control module connector and plug a BOB into the cable assembly.
First test the driver belt tensioner:
a. Connect an ohmmeter between contact 1 on the BOB and a safe grounding point. Then connect the ohmmeter between contact 2 on the BOB and a safe grounding point.
Then measure the passenger belt tensioner.
b. Connect the ohmmeter between contact 3 on the BOB and a safe grounding point. Then connect the ohmmeter between contact 4 on the BOB and a safe grounding point.
In all four measurements, the ohmmeter should show infinite resistance.
If the reading is OK: Proceed to point 8.
If the measurement is incorrect: If any of the measurements shows a low resistance, there is a short to ground on the lead in question. Investigate the cause and change the cable assembly. Then proceed to point 8.
8. 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.