B0100

CIRCUIT DESCRIPTION
The steering wheel module deployment loop consists of a dual stage inflatable restraint steering wheel module, an inflatable restraint steering wheel module coil, the steering wheel module - high and steering wheel module - low circuits. There are 2 shorting bar used in the inflatable restraint steering wheel module and the inflatable restraint steering wheel module coil connectors which will short together the steering wheel module - high and steering wheel module - low circuits when the connector is disconnected, this will help to prevent unwanted deployment of the inflator module during servicing. During a frontal crash of sufficient force the SDM will allow current to flow through the deployment loop in order to deploy the inflatable restraint steering wheel 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.

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

CONDITIONS FOR SETTING THE DTC
- DTC B0100 will set when the SDM detects a low resistance condition in the steering wheel module deployment loop.
- DTC B0101 will set when the SDM detects a high resistance condition in the steering wheel module deployment loop.
- DTC B0102 will set when the SDM detects a short to ground in the steering wheel module deployment loop.
- DTC B0103 will set when the SDM detects a short to voltage in the steering wheel module deployment loop.

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

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 steering wheel module - high and the steering wheel module - low circuits.
- An open or high resistance in the steering wheel module - high or the steering wheel module - low circuits.
- A short to ground in the steering wheel module - high or the steering wheel module - low circuits.
- A short to voltage in the steering wheel module - high or the steering wheel module - low circuits.
- A malfunctioning inflatable restraint steering wheel module.
- A malfunctioning inflatable restraint steering wheel module coil.
- An internal SDM malfunction.

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

TEST DESCRIPTION

Steps 1-6:

Steps 7-10:

Steps 11-13:

Steps 14-16:

The numbers below refer to the step numbers on the diagnostic table.
7. Tests to see if the malfunction is caused by the inflatable restraint steering wheel module.
8. Tests to see if the malfunction is caused by the inflatable restraint steering wheel module coil.
9. Tests to see if the malfunction is caused by the inflatable restraint steering wheel module.
10. Tests to see if the malfunction is caused by the inflatable restraint steering wheel module coil.
12. If DTC B0100 is present, test for a short between the Steering Wheel Module - High and the Steering Wheel Module - Low circuits. If DTC B0101 is present, test the Steering Wheel Module - High and the Steering Wheel Module - Low circuits for an open or high resistance.If DTC B0102 is present, test the Steering Wheel Module - High and the Steering Wheel Module - Low circuits for a short to ground. If DTC B0103 is present, test the Steering Wheel Module - High and the Steering Wheel Module - Low circuits for a short to voltage.