B1830

DTC B1830

CIRCUIT DESCRIPTION
The inflatable restraint roof rail module deployment loop consists of an inflatable restraint roof rail module, the roof rail module - high and roof rail module - low circuits. A shorting bar is used in the inflatable restraint roof rail module connector which will short together the roof rail module - high and roof rail module - low 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.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC B1830 Driver Head Curtain Deployment Loop Resistance Too Low
- DTC B1831 Driver Head Curtain Deployment Loop Resistance Too High
- DTC B1832 Driver Head Curtain Deployment Loop Short To Ground
- DTC B1833 Driver Head Curtain Deployment Loop Short To Voltage

CONDITIONS FOR RUNNING THE DTC
Ignition 1 voltage is within the normal operating voltage range.

CONDITIONS FOR SETTING THE DTC
- DTC B1830 will set when the SDM detects a low resistance condition in the roof rail module - left deployment loop.
- DTC B1831 will set when the SDM detects a high resistance condition in the roof rail module - left deployment loop.
- DTC B1832 will set when the SDM detects a short to ground in the roof rail module - left deployment loop.
- DTC B1833 will set when the SDM detects a short to voltage in the roof rail module - left deployment loop.

ACTION TAKEN WHEN THE DTC SETS
The SDM commands the AIR BAG indicator to flash.

CONDITIONS FOR CLEARING THE DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

DIAGNOSTIC AIDS
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.

The following are possible causes of the malfunction:
- A short between the roof rail module - high and the roof rail module - low circuits
- An open or high resistance in the roof rail module - high or the roof rail module - low circuits
- A short to ground in the roof rail module - high or the roof rail module - low circuits
- A short to voltage in the roof rail module - high or the roof rail module - low circuits
- A malfunctioning inflatable restraint roof rail module
- An internal SDM malfunction

If an intermittent malfunction exists, refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

TEST DESCRIPTION

Steps 1 - 12:

Step 13:

The numbers below refer to the step numbers on the diagnostic table.
7. This step tests to see if the malfunction is caused by the inflatable restraint side impact module.
8. This step tests to see if the malfunction is caused by the inflatable restraint side impact module.
10. If DTC B1830 is present, test for a short between the roof rail module - left - high and the roof rail module - left - low circuits.If DTC B1831 is present, test the roof rail module - left - high and the roof rail module - left - low circuits for an open or high resistance.If DTC B1832 is present, test the roof rail module - left - high and the roof rail module - left - low circuits for a short to ground.If DTC B1833 is present, test the roof rail module - left - high and the roof rail module - left - low circuits for a short to voltage.