B0045
DTC B0040, B0041, or B0045
Circuit Description
The driver side deployment loop consists the following components:
* An inflatable restraint roof rail module - left
* The roof rail module - left high circuits
* The roof rail module - left low circuits
A shorting bar used within the roof rail module connector shorts together both the roof rail module - left high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. During a side or 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 roof rail module. 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 B0040 Left Front Side Deployment Loop Resistance Low
* DTC B0041 Left Front Side Deployment Loop Open
* DTC B0045 Left Front Side 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 B0040 will set when the roof rail module - left deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
* DTC B0041 will set when one of the following conditions occurs:
- Roof rail module - left high circuit is less than 2.4 volts and the roof rail module - left deployment loop is more than 6 ohms for 500 milliseconds.
- Roof rail module - left deployment loop resistance is more than 4.8 ohms for 500 milliseconds.
* DTC B0045 when one of the following conditions occur:
- Roof rail module - left high and/or low circuits is short to ground or short to voltage for 500 milliseconds.
- Roof rail module - left high circuit is less than 2.4 volts and roof rail module - left 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 roof rail module - left high and low circuits
* An open or a high resistance in the roof rail module - left high or low circuits
* A short to ground or a short to voltage in the roof rail module - left high or low circuits
* The roof rail module - left connector
* The SDM connector
* A malfunctioning roof rail module - left
* 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 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 roof rail module - left.
6. This step tests to see what DTCs are present. If DTC B0040 is present, test for a short between the roof rail module - left high and low circuits. If DTC B0041 is present, test the roof rail module - left high and low circuits for an open and for high resistance. If DTC B0045 is present, test the roof rail module - left high and low circuits for a short to ground and for a short to voltage.