Circuit Description
The driver side deployment loop consists of the following components:
| • | An inflatable restraint side impact module - LF |
| • | The inflatable restraint side impact module wiring harness |
| • | The side impact module - LF high circuits |
| • | The side impact module - LF low circuits |
A shorting bar is used within the side impact module - LF connector. The shorting bar will short together the side impact module - LF high circuit, and the side impact module - LF low circuit when the connector is disconnected. This helps 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. This flow of current will deploy the side impact module - LF. 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 side impact module - LF deployment loop resistance is less than 1.3 ohms for 500 milliseconds. |
| • | DTC B0041 will set when one of the following conditions occurs: |
| - | Side impact module - LF high circuit is less than 2.4 volts and the side impact module - LF deployment loop is more than 6 ohms for 500 milliseconds. |
| - | Side impact module - LF deployment loop resistance is more than 4.8 ohms for 500 milliseconds. |
| • | DTC B0045 will set when one of the following conditions occur: |
| - | Side impact module - LF high and/or low circuits is short to ground or short to voltage for 500 milliseconds. |
| - | Side impact module - LF high circuit is less than 2.4 volts and side impact module - 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 side impact module - LF high and low circuits |
| • | An open or a high resistance in the side impact module - LF high or low circuits |
| • | A short to ground or a short to voltage in the side impact module - LF high or low circuits |
| • | The side impact module - LF connector |
| • | The SDM connector |
| • | A malfunctioning side impact module - LF |
| • | 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 .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests to see if the malfunction is caused by the side impact module - LF or by the side impact module - LF wiring harness.
-
This step tests to see what DTCs are present. If DTC B0040 s present, test the side impact module - LF for a short between high and low circuits. If DTC B0041 is present, test the side impact module - LF high and low circuits for an open and for high resistance. If DTC B0045 is present, test the side impact module - LF high and low circuits for a short to ground or a short to voltage.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | 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 11 | -- |
4 |
Important: If scan tool displays multiple codes, diagnose the open code first. Does the scan tool indicate that DTC B0040, B0041, or B0045 are current? | Go to Step 6 | Go to Step 5 |
Does the scan tool indicate that DTC B0040, B0041, or B0045 are current? | Go to Step 9 | Go to Step 8 | |
6 |
Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
Did you find and correct the condition? | Go to Step 11 | Go to Step 10 | |
8 |
Did you complete the replacement? | Go to Step 11 | -- |
9 |
Did you complete the replacement? | Go to Step 11 | -- |
10 |
Did you complete the replacement? | Go to Step 11 | -- |
11 |
Does the DTC reset? | Go to Step 2 | System OK |
