B2448
Diagnostic Trouble Code B2443 / Diagnostic Trouble Code B2448 - Driver belt tensioner/passenger belt tensioner, short to battery positive terminal.e�1:
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 intermittent: 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. Unplug the connectors from the belt tensioners. Connect reference resistor 84 71 153 to the connectors. Proceed to point 4.
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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 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 remove the negative battery lead. Remove the reference resistor from the belt tensioner connector on the driver side 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 on the driver side.
Then proceed to point 13.
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.
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6. Switch off the ignition and remove the negative battery lead. Refit the reference resistor to the belt tensioner connector on the driver side.
Remove the reference resistor from the belt tensioner connector on the passenger side and connect 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 on the passenger side.
Then proceed to point 13.
If the diagnostic trouble code does not return:
Switch off the ignition and remove the negative battery lead. Unplug the connector from the belt tensioner. Refit the negative battery lead and proceed to point 7.
7. Switch off the ignition and remove the reference resistors from both the belt tensioner connectors. Free the SRS control module. Remove the connector from the SRS control module and connect a BOB to the cable assembly. Switch on the ignition.
Test the driver side belt tensioner: Connect a voltmeter between contact 1 on the BOB and a safe grounding point. Then connect the voltmeter between contact 2 on the BOB and a safe grounding point.
In both cases, the voltmeter should show 0 V.
If the value is OK: Proceed to point 10.
If the value is incorrect: Proceed to point 8.
n>2:
8. Unplug the 4 pin connector located on the floor tunnel under the carpet, about 20 cm in front of the SRS control module.
Measure the voltage in the cable assembly between the SRS control module and the 4 pin connector:
Connect a voltmeter between sleeve 1 in the female part of the connector and a safe grounding point.
Then connect a voltmeter between sleeve 2 in the female part of the connector and a safe grounding point.
In both cases, the voltmeter should show 0 V.
If the value is OK: Proceed to point 9.
If the value is incorrect: If any of the measurements shows voltage,there is a bypass to battery positive voltage 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 13.
Gi2:
9. Measure the voltage in the cable assembly between the belt tensioner and the 4 pin connector:
Connect a voltmeter between pin 1 in the male part of the connector and a safe grounding point. Then connect a voltmeter between pin 2 in the male part of the connector and a safe grounding point.
In both cases, the voltmeter should show 0 V.
If the value is OK: Proceed to point 13.
If the value is incorrect: If any of the measurements shows voltage, there is a bypass to battery positive voltage in the cable assembly between the belt tensioner connector and the 4 pin connector.
Investigate the cause and remedy the fault. Then proceed to point 13.
10. Test the passenger side belt tensioner: Connect the voltmeter between contact 3 on the BOB and a safe grounding point. Then connect the voltmeter between contact 4 on the BOB and a safe grounding point.
The voltmeter should show 0 V.
If the value is OK: Proceed to point 13.
If the value is incorrect: Proceed to point 11.
E�2:
11. Unplug the 4 pin connector located on the floor tunnel under the carpet, about 20 cm in front of the SRS control module.
Measure the voltage in the cable assembly between the SRS control module and the connector:
Connect a voltmeter between sleeve 3 in the female part of the connector and a safe grounding point.
Then connect a voltmeter between sleeve 4 in the female part of the connector and a safe grounding point.
The voltmeter should show 0 V.
If the value is OK: Proceed to point 12.
If the value is incorrect: If any of the measurements shows voltage,there is a bypass to battery positive voltage 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 13.
2�2:
12. Measure the voltage in the cable assembly between the belt tensioner and the 4 pin connector:
Connect a voltmeter between pin 3 in the male part of the connector and a safe grounding point. Then connect a voltmeter between pin 4 in the male part of the connector and a safe grounding point.
The voltmeter should show 0 V.
If the value is OK: Proceed to point 13.
If the value is incorrect: If any of the measurements shows voltage, there is a bypass to battery positive voltage in the cable assembly between the belt tensioner connector and the 4 pin connector.
Investigate the cause and remedy the fault.
Then proceed to point 13.
13. 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.