Circuit Description
The driver seat belt pretensioner deployment loop consists of an seat belt pretensioner - LF, the seat belt pretensioner high and low circuits. A shorting bar is used in the seat belt pretensioner connector which will short together the pretensioner high and pretensioner low circuits when the connector is disconnected, this will help to prevent unwanted deployment of the pretensioner during servicing. During a frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the 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 in non-volatile memory.
Conditions for Running the DTC
Ignition 1 Voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The DTC will set if one of the following conditions occurs:
| • | Seat belt pretensioner - LF high and/or low is short to ground or a short to voltage for 500 milliseconds. |
| • | Seat belt pretensioner - LF high terminal is less than 2.4 volts and seat belt pretensioner deployment loop resistance is less than 6 ohms for 500 milliseconds. |
Action Taken When the DTC Sets
The SDM commands the AIR BAG warning indicator ON via Class 2 serial data.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. |
| • | A history DTC will clear once 255 malfunction free ignition cycles have occurred. |
Diagnostic Aids
The following are possible causes of the malfunction:
| • | A short to ground or a short to voltage in the seat belt pretensioner - LF circuits. |
| • | A malfunctioning seat belt pretensioner - LF. |
| • | An internal SDM malfunction. |
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. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Test to see if there is a malfunctioning seat belt pretensioner - LF.
-
Test for a short to ground or short to voltage in the seat belt pretensioner - LF high and low circuits.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics | |||
1 | Did you perform A Diagnostic System Check - SIR? | Go to Step 2 | |
2 |
Does connector exhibits any signs of damage or corrosion? | Go to Step 3 | Go to Step 4 |
3 |
Did you complete the repair? | Go to Step 9 | -- |
Important: When installing J 38715-A SIR Driver/Passenger Load Tool for testing the pretensioner - LF module, the correct load tool adapter connector must be used. Failure to use the correct load tool adapter will set additional codes when testing. Does the scan tool indicate that this DTC 0066 is current? | Go to Step 5 | Go to Step 7 | |
5 |
Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
Test the seat belt pretensioner - LF high and seat belt pretensioner - LF low circuits for a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 | |
7 |
Did you complete the replacement? | Go to Step 9 | -- |
8 |
Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
