B0071
DTC B0069, B0070, or B0071
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0069
- Right Front/Passenger Roof Rail/Head Curtain Bag Deployment Loop Resistance Low
DTC B0070
- Right Front/Passenger Roof Rail/Head Curtain Bag Deployment Loop Open
DTC B0071
- Right Front/Passenger Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range
Diagnostic Fault Information
Circuit/System Description
The driver roof rail deployment loop consists of an inflatable restraint roof rail module - right and the roof rail module high and low circuits. A shorting bar used within the roof rail module connector shorts together both the roof rail module high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module 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 roof rail 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 memory.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0069
The DTC will set when the roof rail module - right deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0070
The DTC will set when one of the following conditions occur:
* 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.
B0071
The DTC when one of the following conditions occur:
* Roof rail module - right high or low circuits is short to ground or short 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 commands the AIR BAG indicator ON via class 2 serial data.
* 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.
* A history DTC will clear once 255 malfunction-free ignition cycles have occurred.
Special Tools
* J 38715-A SIR Driver/Passenger Load Tool
* J 38715-30A Load Tool Adapter
Circuit/System Testing
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
* The right roof rail module
* The SDM
* The right roof rail module wiring harness connector
* The SDM wiring harness connector
1. Ignition OFF, disconnect harness connector at the right roof rail module.
2. Use J 38715-30A to connect the J 38715-A to the harness side of the right roof rail module. Use the PASSENGER INFLATOR connector located on the load tool.
3. Ignition ON, verify B0069, B0070, or B0071 is set current.
^ If B0069, B0070, or B0071 is history replace the right roof rail module.
4. Ignition OFF, disconnect and remove the J 38715-A.
5. Disconnect the harness connector at the SDM.
6. Test for infinite resistance between the right roof rail module circuit terminal A and ground.
^ If less than the specified range, test the circuit for a short to ground.
7. Test for infinite resistance between the right roof rail module circuit terminal B and ground.
^ If less than the specified range, test the circuit for a short to ground.
8. Ignition ON, test for less than 1 volt between the right roof rail module control circuit terminal A and ground.
^ If greater than the specified range, test the control circuit for a short to voltage.
9. Test for less than 1 volt between the right roof rail module control circuit terminal B and ground.
^ If greater than the specified range, test the control circuit for a short to voltage.
10. Ignition OFF, test for less then 1 ohm between the right roof rail module terminal A and SDM signal circuit terminal 14.
^ If greater than the specified range, test the circuit for an open/high resistance.
11. Test for less then 1 ohm between the right roof rail module terminal B and SDM voltage circuit terminal 15.
^ If greater than the specified range, test the circuit for an open/high resistance.
12. If all circuits test normal, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* SIR/SRS Wiring Repairs
* Roof Side Rail Inflatable Restraint Module Replacement - Front