• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Steering Wheel Module Stage 1 High Control | B0012 02 | B0012 0D | B0012 08 | B0012 01 | B0012 0E |
Steering Wheel Module Stage 1 Low Control | B0012 02 | B0012 0D | B0012 08 | B0012 01 | B0012 0E |
Steering Wheel Module Stage 2 High Control | B0013 02 | B0013 0D | B0013 08 | B0013 01 | B0013 0E |
Steering Wheel Module Stage 2 Low Control | B0013 02 | B0013 0D | B0013 08 | B0013 01 | B0013 0E |
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 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. There are 2 shorting bars used within the steering wheel module coil connector which will short together both steering wheel module stage 1 high circuit and steering wheel module stage 1 low circuit and both steering wheel module stage 2 high circuit and steering wheel module stage 2 low circuit when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing.
Ignition voltage is between 9-16 volts.
The steering wheel module high and/or low control circuit is shorted to voltage for 2 seconds.
The steering wheel module high and/or low control circuit is shorted to ground for 2 seconds.
The steering wheel module high and/or low control circuit is invalid during SDM initialization.
The steering wheel module deployment loop resistance is more than 5.5 ohms for 2 seconds.
The steering wheel module deployment loop resistance is less than 1.7 ohms for 2 seconds.
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
• | The SDM will store a DTC, however if an event occurs the system will still attempt deployment. |
• | The condition for setting the DTC is no longer present |
• | A history DTC will clear after 100 fault-free ignition cycles |
Control Module References for scan tool information
Important: Refer to SIR Service Precautions.
When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.• | Steering wheel coil module |
• | SDM module |
• | Steering wheel coil module wiring harness connector |
• | SDM wiring harness connector |
Important: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.
⇒ | If less than the specified range, test the control circuits for a short to ground. If the circuits test normal, replace the SDM. |
• | Steering wheel module stage 1 terminal 1 X1 and terminal 2 X1 |
• | Steering wheel module stage 2 terminal 1 X2 and terminal 2 X2 |
⇒ | If greater than the specified range, test the control circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the SDM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for SDM replacement, setup, and programming |