B0070
DTC B0069, B0070, or B0071
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0069
- Right Roof Rail Air Bag Deployment Loop Resistance Low
DTC B0070
- Right Roof Rail Air Bag Deployment Loop Open
DTC B0071
- Right Roof Rail Air Bag Deployment Loop Voltage Out of Range
Diagnostic Fault Information
Circuit/System Description
The right roof rail air bag deployment loop consists of high and low circuits. A shorting bar used within the right roof rail air bag connector shorts together both the high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the air bag during servicing. 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 right roof rail 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. If a malfunction is detected, a diagnostic trouble code (DTC) will be stored in memory.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0069
DTC B0069 will set when the right roof rail air bag deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0070
DTC B0070 will set when one of the following conditions occurs:
* Right roof rail air bag high circuit is less than 2.4 volts and the right roof rail air bag deployment loop is greater than 6 ohms for 500 milliseconds.
* Right roof rail air bag deployment loop resistance is greater than 4.8 ohms for 500 milliseconds.
B0071
DTC B0071 will set when one of the following conditions occur:
* Right roof rail air bag high or low circuits are shorted to voltage or shorted to ground for 500 milliseconds.
* Right roof rail air bag high circuit is less than 2.4 volts and right roof rail air bag 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 responsible for setting the DTC no longer exists and the scan tool Clear DTC function is used.
* A history DTC will clear once 255 malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
SIR Schematics [1][2]Air Bag Systems
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
SIR System Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
J 38715-A SIR Driver/Passenger Load Tool
Circuit/System Testing
Important: Refer to SIR Service Precautions Technician Safety Information.
When removing the connectors, inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
* Right roof rail air bag
* SDM
* Right roof rail air bag 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 shoring-bars within the connector allowing the deployment circuit to operate properly.
1. Verify that the right roof rail air bag connector and CPA are engaged.
• If the above condition is not found, make the appropriate repair.
2. Ignition OFF, disconnect the harness connector at the right roof rail air bag.
3. With the appropriate load tool adapter, connect J 38715-A in place of the right roof rail air bag.
4. Ignition ON, with a scan tool, verify that the appropriate DTC is set as current.
• If the DTC is not set or is set as history, cycle the ignition OFF, disconnect the load tool and adapter, reconnect the harness connector at the right roof rail air bag , and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the right roof rail air bag.
5. Ignition OFF, disconnect the load tool and the adapter.
6. Disconnect the harness connector at the SDM.
7. Ignition ON, test for less than 1.0 volt between the low control circuit terminal 15 and ground.
• If not within the specified range, test the control circuit for a short to voltage.
8. Ignition ON, test for less than 1.0 volt between the high control circuit terminal 14 and ground.
• If not within the specified range, test the control circuit for a short to voltage.
9. Ignition OFF, test for infinite resistance between the low control circuit terminal 15 and ground.
• If not within the specified range, test the control circuit for a short to ground.
10. Ignition OFF, test for infinite resistance between the high control circuit terminal 14 and ground.
• If not within the specified range, test the control circuit for a short to ground.
11. Test for less than 1.0 ohm between the low control circuit right roof rail air bag terminal 4 and the SDM terminal 15.
• If not within the specified range, test the control circuit for an open/high resistance.
12. Test for less than 1.0 ohm between the high control circuit right roof rail air bag terminal 3 and the SDM terminal 14.
• If not within the specified range, test the control circuit for an open/high resistance.
13. If all circuits test normal, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Inflatable Restraint Roof Side Rail Module Replacement - Front (Crew Cab) Inflatable Restraint Roof Side Rail Module Replacement - Front (Crew Cab)Inflatable Restraint Roof Side Rail Module Replacement - Front (Regular and Extended Cab) Inflatable Restraint Roof Side Rail Module Replacement - Front (Regular and Extended Cab)
* Control Module References Control Module References for SDM replacement, setup, and programming