B0040

DTC B0040

CIRCUIT DESCRIPTION
The inflatable restraint side impact module deployment loop consists of a side impact module, side impact module high control, and side impact module low control circuits. A shorting bar is used on the side impact module connector which will short together the side impact module high and side impact module low control circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (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 Curtain Deployment Loop Resistance Low
- DTC B0041 Left Curtain Deployment Loop Open
- DTC B0045 Left Curtain Deployment Loop 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 SDM detects the LF side impact module deployment loop resistance is less than 1.3 ohm for 500 milliseconds.
- DTC B0041 will set when one of the following conditions occurs:
- The SDM detects the LF side impact module deployment loop resistance is greater than 4.8 ohm for 500 milliseconds.
- The SDM detects the voltage at LF side impact module high control is less than 2.4 volts and LF side impact module deployment loop resistance is 6 ohm or greater for 500 milliseconds.
- DTC B0045 will set when one of the following conditions occur:
- The SDM detects the voltage at LF side impact module high control is greater than 6 volts for 500 milliseconds.
- The SDM detects the voltage at LF side impact module high control is less than 2.4 volts and LF side impact module deployment loop resistance is less than 6 ohm 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.
- You issue a scan tool CLEAR DTCs command.
- A history DTC will clear once 255 malfunction free ignition cycles have occurred.

DIAGNOSTIC AIDS
The following can cause an intermittent condition:
- A short between the LF side impact module high and LF side impact module low control circuits
- An open or high resistance in the LF side impact module high or LF side impact module low control circuits
- A malfunctioning shorting bar on the LF side impact module connector

TEST DESCRIPTION

Steps 1-9:

Steps 10-11:

The numbers below refer to the step numbers on the diagnostic table.
2. Inspects the LF side impact module in-line connector.
4. Tests for a malfunctioning LF side impact module.
7. If DTC B0040 is present, test for a short between the LF side impact module high and LF side impact low control circuits. If DTC B0041 is present, test for an open or high resistance in the LF side impact module high and LF side impact module low control circuits. If DTC B0045 is present, test for a short to ground or voltage in the LF side impact module high and LF side impact module low control circuits.