Circuit Description
The seat belt pretensioner deployment loop consists of a seat belt pretensioner, the seat belt pretensioner high and seat belt pretensioner low circuits. A shorting bar is used in the seat belt pretensioner connector, which will short together the seat belt pretensioner high and seat belt pretensioner low circuits, when the connector is disconnected. This will help to prevent unwanted deployment of the seat belt pretensioner during servicing. During a frontal crash of sufficient force, the sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the seat belt pretensioner. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity, and for shorts to ground or voltage. If a malfunction is detected, a DTC will be stored.
DTC Descriptor
This diagnostic procedure supports the following DTCs:
DTC 0051 Driver Side Pretensioner Circuit Capacitance Too High
DTC 0052 Driver Side Pretensioner Circuit Capacitance Too Low
Conditions for Running the DTC
Ignition voltage is within the normal operating voltage range.
Conditions for Setting the DTC
| • | DTC 0051 will set when the SDM detects a high capacitance condition in the LH seat belt pretensioner deployment loop. |
| • | DTC 0052 will set when the SDM detects a low capacitance condition in the LH seat belt pretensioner deployment loop. |
Action Taken When the DTC Sets
The SDM commands the AIR BAG indicator ON.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
| • | A high capacitance in the LH seat belt pretensioner capacitor |
| • | A low capacitance in the LH seat belt pretensioner capacitor |
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | |||
1 | Did you perform a Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 | Is DTC 0051 or 0052 set as a current DTC? | Go to Step 3 | Go to Diagnostic Aids |
3 | Replace the LH seat belt pretensioner. Refer to Seat Belt Buckle Pretensioner Replacement . Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC reset? | Go to Step 2 | System OK |
