DTC B0024 Standard Air Bags
Circuit Description
The driver deployment loop consists of an inflatable restraint steering wheel module, inflatable restraint steering wheel module coil, the steering wheel module high and steering wheel module low circuits. A shorting bar is used in the inflatable restraint steering wheel module connector 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 inflatable restraint sensing and diagnostic module (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 in non-volatile memory.
Conditions for Running the DTC
Ignition 1 Voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The DTC will set if one of the following conditions occurs:
| • | Steering wheel module high and/or low circuits is short to ground or short to voltage for 500 milliseconds. |
| • | Steering wheel module high terminal is less than 2.4 volts and steering wheel module deployment loop resistance is less than 6 ohms for 500 milliseconds. |
Action Taken When the DTC Sets
The SDM commands the AIR BAG warning indicator ON via Class 2 serial data.
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
The following are possible causes of the malfunction:
| • | A short to ground or a short to voltage in the steering wheel module circuits |
| • | A malfunctioning inflatable restraint steering wheel module |
| • | A malfunctioning inflatable restraint steering wheel module coil |
| • | An internal SDM malfunction |
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. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Tests to see if the malfunction is caused by the steering wheel module or by the steering wheel module coil.
-
Tests for a short to ground or a short to voltage in the steering wheel module high and steering wheel module low circuits.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics | |||
1 | Did you perform A Diagnostic System Check - SIR? | Go to Step 2 | |
2 |
Does the connector exhibit any signs of damage or corrosion? | Go to Step 3 | Go to Step 4 |
3 |
Did you complete the repair? | Go to Step 11 | -- |
4 |
Does the scan tool indicate that this DTC 0024 is current? | Go to Step 8 | Go to Step 5 |
Does the scan tool indicate that this DTC 0024 is current? | Go to Step 6 | Go to Step 7 | |
6 |
Did you complete the replacement? | Go to Step 11 | -- |
7 |
Did you complete the replacement? | Go to Step 11 | -- |
8 |
Did you find and correct the condition? | Go to Step 11 | Go to Step 9 |
Test the steering wheel module high and the steering wheel low circuits for a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 | |
10 |
Did you complete the replacement? | Go to Step 11 | -- |
11 |
Does the DTC reset? | Go to Step 2 | System OK |
DTC B0024 Dual Stage Air Bags
Circuit Description
The driver deployment loop consists of an dual stage inflatable restraint steering wheel module, the inflatable restraint steering wheel module coil, steering wheel module - stage 1 high and steering wheel module - stage 1 low circuits. A shorting bar is used in the steering wheel module connector which will short together both steering wheel module stage 1 & 2 high circuits and steering wheel module stage 1 & 2 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 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. If a malfunction is detected, a DTC will be stored in non-volatile memory.
Conditions for Running the DTC
Ignition 1 Voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The DTC will set if one of the following conditions occurs:
| • | Steering wheel module - stage 1 high and/or low circuits is short to ground or short to voltage for 500 milliseconds. |
| • | Steering wheel module - stage 1 high terminal is less than 2.4 volts and steering wheel module - stage 1 deployment loop resistance is less than 6 ohms for 500 milliseconds. |
Action Taken When the DTC Sets
The SDM commands the AIR BAG warning indicator ON via Class 2 serial data.
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
The following are possible causes of the malfunction:
| • | A short to ground or a short to voltage in the steering wheel module - stage 1 circuits |
| • | A malfunctioning steering wheel module |
| • | A malfunctioning steering wheel module coil |
| • | An internal SDM malfunction |
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. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Tests to see if the malfunction is caused by the steering wheel module or by the steering wheel module coil.
-
Tests for a short to ground or a short to voltage in the steering wheel module - stage 1 high and steering wheel module - stage 1 low circuits.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics | |||
1 | Did you perform A Diagnostic System Check - SIR? | Go to Step 2 | |
2 |
Does the exhibit any signs of damage or corrosion? | Go to Step 3 | Go to Step 4 |
3 |
Did you complete the repair? | Go to Step 11 | -- |
4 |
Important: When installing J 38715-A SIR Driver/Passenger Load Tool for testing the dual stage steering wheel module, the correct 4 way load tool adapter connector must be used. Failure to use the correct 4 way load tool connector will set additional codes when testing. Does the scan tool indicate that this DTC 0024 is current? | Go to Step 8 | Go to Step 5 |
Important: When installing J 38715-A SIR Driver/Passenger Load Tool for testing the dual stage steering wheel module, the correct 4 way load tool adapter connector must be used. Failure to use the correct 4 way load tool connector will set additional codes when testing. Does the scan tool indicate that this DTC 0024 is current? | Go to Step 6 | Go to Step 7 | |
6 |
Did you complete the replacement? | Go to Step 11 | -- |
7 |
Did you complete the replacement? | Go to Step 11 | -- |
8 |
Did you find and correct the condition? | Go to Step 11 | -- |
Test the steering wheel module - stage 1 high and the steering wheel module - stage 1 low circuits for a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 | |
10 |
Did you complete the replacement? | Go to Step 11 | -- |
11 |
Does the DTC reset? | Go to Step 2 | System OK |
