050B Pretensioner Squib Leak to Ground

5. Switch on the ignition and check for a positive potential on the squib feed or return lines at the two pins of the squib harness connector (activating circuits in the rearward harness in turn may assist in identifying the voltage source). If a positive potential is detected, switch off and repair the circuit fault.

If no short circuit is detected in the rearward harness, go to step 6.

6. With the ignition switched off and the pretensioner squib disconnected, check the squib harness for physical damage.

If any damage is detected, replace the complete pretensioner squib assembly.

If no damage is detected, the fault is possibly in the pretensioner control module. Replace the control module.

7. Remove the cheater from the control module connector.

Reconnect all components. Switch on the ignition and test the vehicle to ensure that the problem is resolved.

050B Pretensioner Squib Leak to Ground

050B will be logged if the resistance of the pretensioner squib feed or return line to ground falls below 1kΩ.

Procedure

1. Read the warnings given at the start of this pretensioner diagnostics section.
2. Connect the PDU to the lower diagnostic socket and access the pretensioner control module. Verify that an 050B code is logged and note if the fault is shown as intermittent. Note any other codes in the DTC log and then clear all codes.
3. Switch off the ignition and wait at least 10 minutes for the pretensioner squib firing capacitors to fully discharge before continuing with this procedure.
4. Disconnect the pretensioner squib connector at the rearward harness. Disconnect the pretensioner control module and temporarily cheat the squib shorting link.

Note: The control module harness connector has a shorting link which short circuits the squib lines together when the connector is displaced. Carefully insert a suitable non-metallic cheater to remove the short circuit between pins 11 and 12 before continuing with fault diagnosis.

5. Check for a short circuit to vehicle ground on the squib feed or return lines at the two pins of the squib harness connector. If a short circuit is detected, switch off and repair the circuit fault.

If no short circuit is detected in the rearward harness, go to step 6.

6. With the ignition switched off and the pretensioner squib disconnected, check the squib harness for physical damage.

If any damage is detected, replace the complete pretensioner squib assembly.

If no damage is detected, the fault is possibly in the pretensioner control module. Replace the control module.

7. Remove the cheater from the control module connector. Reconnect all components. Switch on the ignition and test the vehicle to ensure that the problem is resolved.