B0040

DTC B0040

DTC DESCRIPTORS

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

DIAGNOSTIC FAULT INFORMATION






IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
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 - left. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. A shorting bar used within the roof rail module - left connector which will short together both 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.

CONDITIONS FOR RUNNING THE DTC
Ignition voltage is between 9-16 volts.

CONDITIONS FOR SETTING THE DTC

B0040
The roof rail module - left deployment loop resistance is less than 1.3 ohms for 500 milliseconds.

B0041
- 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.

B0045
- 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 serial data communication.
- The SIR system is disabled and no deployments are allowed.

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
If there is more than one DTC set diagnose the open DTC first.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, remove the left garnish molding and disconnect the roof rail module-left in-line connector.

IMPORTANT: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
- The roof rail module - left
- The SDM module
- The roof rail module - left wiring harness connector
- The SDM wiring harness connector

2. Use the J 38715-30A to connect the J 38715-A to the harness side of the roof rail module - left in-line connector. Use the PASSENGER INFLATOR connector located on the load tool.
3. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0040, B0041, or B0045 is set in current.
- If DTC B0040, B0041, or B0045 is history replace the roof rail module - left.
4. Ignition OFF, disconnect and remove both the J 38715-A and adapter. Then remove the SDM connector.
5. Test and repair the high and low circuits between the SDM and roof rail module - left for a short to voltage, short to ground, or open/low resistance. Verify that a short to voltage, short to ground, or open/low resistance does not exist.
- If any of the above conditions are found make the appropriate repair.
6. If all circuits test normal then replace the SDM.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Inflatable Restraint Roof Rail Module Replacement - Left
- Control Module References for SDM replacement, setup, and programming