050C Pretensioner Squib High Resistance

050C Pretensioner Squib High Resistance

050C will be logged if the resistance of the pretensioner squib circuit rises above 4.5 ±0.5Ω

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 050C 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 the continuity of the squib feed and return lines. If any significant resistance is measured, service the wiring as necessary. Also check the condition of the connector pins for damage or lack of tension and service as necessary. If the circuit resistance is acceptable and the connector pins are good, go to step 6. If any defects are identified and serviced, go to step 7.
6. If the checks in step 4 are good, the high circuit resistance must be in the pretensioner squib or in the control module. Replace the pretensioner squib and reconnect all components.
7. Clear all logged DTCs from the pretensioner control module and then test the vehicle. If the 050C code is logged again, replace the control module.

050D Pretensioner squib low resistance

050D will be logged if the resistance of the pretensioner squib circuit falls below 1.4 ±0.4Ω

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 050D 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 the continuity from the squib feed line to the squib return line. With the shorting link cheated, the resistance should be more than 10kΩ. If the resistance is less than 10kΩ, service the wiring as necessary. Also check the connector pins for any damage which could cause an unintentional short circuit.
6. If the checks in step 5 are good, the low circuit resistance must be in the pretensioner squib or in the control module. Replace the pretensioner squib and reconnect all components.
7. Clear all logged DTCs from the pretensioner control module and then test the vehicle. If the 050D code is logged again, replace the control module.