Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B0012 01
- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Short to Battery
DTC B0012 02
- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Short to Ground
DTC B0012 04
- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Open Circuit
DTC B0012 0D
- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Resistance Above Threshold
DTC B0012 0E
- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Resistance Below Threshold
DTC B0013 01
- Driver Steering Wheel Air Bag Deployment Loop Stage 2 Short to Battery
DTC B0013 02
- Driver Steering Wheel Air Bag Deployment Loop Stage 2 Short to Ground
DTC B0013 04
- Driver Steering Wheel Air Bag Deployment Loop Stage 2 Open Circuit
DTC B0013 0D
- Driver Steering Wheel Air Bag Deployment Loop Stage 2 Resistance Above Threshold
DTC B0013 0E
- Driver Steering Wheel Air Bag Deployment Loop Stage 2 Resistance Below Threshold
Diagnostic Fault Information
Circuit/System Description
If a malfunction is detected, a DTC will be stored in non-volatile memory. During a 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 driver steering wheel air bag. The SDM
performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage.
There are 2 shorting bars used within each connector which will short together both driver steering wheel air bag stage 1 high circuit and driver
steering wheel air bag stage 1 low circuit and both driver steering wheel air bag stage 2 high circuit and driver steering wheel air bag stage 2 low
circuit when the connector is disconnected. This will help to prevent unwanted deployment of the air bag during servicing.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0012 01 Stage 1 or B0013 01 Stage 2
The driver steering wheel air bag high and/or low circuit is shorted to voltage for 120 milliseconds.
