B0066
DTC B0064, B0065, or B0066
Circuit Description
The driver seat belt retractor pretensioner - LF deployment loop consists the following components:
* An inflatable restraint seat belt retractor pretensioner - LF
* The seat belt retractor pretensioner - LF high circuits
* The seat belt retractor pretensioner - LF low circuits
A shorting bar used within the seat belt retractor pretensioner connector will short together both seat belt pretensioner high and 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 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 in memory.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
* DTC B0064 Left Front Pretensioner Deployment Loop Resistance Low
* DTC B0065 Left Front Pretensioner Deployment Loop Open
* DTC B0066 Left Front Pretensioner Deployment Loop Voltage Out of Range
Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.
Conditions for Setting the DTC
* DTC B0064 will set when the seat belt pretensioner - LF deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
* DTC B0065 will set when one of the following conditions occurs:
- Seat belt pretensioner - LF high circuit is less than 2.4 volts and the seat belt pretensioner - LF deployment loop is more than 6 ohms for 500 milliseconds.
- Seat belt pretensioner - LF deployment loop resistance is more than 4.8 ohms for 500 milliseconds.
* DTC B0066 will set when one of the following conditions occur:
- Seat belt pretensioner - LF high or low circuits is short to ground or short to voltage for 500 milliseconds.
- Seat belt pretensioner - LF high circuit is less than 2.4 volts and seat belt pretensioner - LF deployment loop resistance is less than 6 ohms for 500 milliseconds.
Action Taken When the DTC Sets
The SDM commands the AIR BAG 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 between the seat belt pretensioner - LF high and low circuits
* An open or a high resistance in the seat belt pretensioner - LF high or low circuits
* A short to ground or a short to voltage in the seat belt pretensioner - LF high or low circuits
* The seat belt pretensioner - LF connector
* The SDM connector
* A malfunctioning seat belt pretensioner
* A malfunctioning SDM
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 Diagnostic Aids. Component Tests and General Diagnostics
Test Description
Step 1 - Step 8:
Step 9:
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests to see if the malfunction is caused by the seat belt pretensioner - LF.
6. This step tests to see what DTCs are present. If DTC B0064 is present, test for a short between the seat belt pretensioner - LF high and low circuits. If DTC B0065 is present, test the seat belt pretensioner - LF high and low circuits for an open and for high resistance. If DTC B0066 is present, test the seat belt pretensioner - LF high and low circuits for a short to ground and for a short to voltage.