Diagnostic Instructions
| • | 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. |
DTC Descriptors
DTC B0028: Right Front Side Deployment Loop Resistance LowDTC B0029: Right Front Side Deployment Loop Open
DTC B0030: Right Front Side Deployment Loop Voltage Out of Range
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Roof Rail Module - Right High Control | B0030 | B0030 | B0029 | B0028 |
Roof Rail Module - Right Low Control | B0030 | B0030 | B0029 | B0028 |
Roof Rail Module - Left High Control | B0045 | B0045 | B0041 | B0040 |
Roof Rail Module - Left Low Control | B0045 | B0045 | B0041 | B0040 |
Circuit/System Description
During a side or 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 roof rail module - right. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. A shorting bar used within the roof rail module - right connector which will short together both roof rail module - right high and low circuits when the connector is disconnected, this will help to prevent unwanted deployment of the inflator module during servicing.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0028
The roof rail module - right deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0029
| • | Roof rail module - right high circuit is less than 2.4 volts and the roof rail module - right deployment loop is more than 6 ohms for 500 milliseconds. |
| • | Roof rail module - right deployment loop resistance is more than 4.8 ohms for 500 milliseconds. |
B0030
| • | Roof rail module - right high and/or low circuits is shorted to ground or shorted to voltage for 500 milliseconds. |
| • | Roof rail module - right high circuit is less than 2.4 volts and roof rail module - right deployment loop resistance is less than 6 ohms for 500 milliseconds. |
Action Taken When the DTC Sets
| • | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
| • | The SIR system is disabled and no deployments are allowed. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Diagnostic Aids
If there is more than one DTC set diagnose the open DTC first.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Special Tools
J 38715-A Driver and Passenger SIR Load Tool
Circuit/System Testing
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
• Roof rail module - right • SDM module • Roof rail module - right wiring harness connector • SDM wiring harness connector
- Verify that the roof rail module connector and CPA are engaged.
- Ignition OFF, disconnect the roof rail module.
- Use the J 38715-30A adapter to connect the J 38715-A to the harness side of the roof rail module connector in place of the RF inflatable restraint side impact module.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0028, B0029, or B0030 is set in current.
- Ignition OFF, disconnect and remove both the J 38715-A and adapter.
- Disconnect the SDM harness connector.
- Ignition ON, test for less than 1 volt between the roof rail module high control circuit terminal 1 ground.
- Test for less than 1 volt between the roof rail module low control circuit terminal 2 and ground.
- Ignition OFF, test for infinite resistance between the roof rail high control circuit terminal 1 and ground.
- Test for infinite resistance between the roof rail low control circuit terminal 2 and ground.
- Test for less then 1 ohm between the roof rail high control circuit terminal 1 and the SDM C4
- Test for less then 1 ohm between the roof rail low control circuit terminal 2 and the SDM C3.
- If all circuits test normal then replace the SDM.
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 the above condition is not found, make the appropriate repair. |
| ⇒ | If DTC B0028, B0029, or B0030 is not set or is set as history, cycle ignition OFF, disconnect the adapter and J 38715-A , reconnect the harness connector at the roof rail module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the roof rail module. |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage. |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage. |
| ⇒ | If less than the specified value, test the control circuit for a short to ground. |
| ⇒ | If less than the specified value, test the control circuit for a short to ground. |
| ⇒ | If greater than the specified range, test the control circuit for an open/high resistance. |
| ⇒ | If greater than the specified range, test the control circuit for an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
