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 B0061: Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Resistance LowDTC B0062: Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Open
DTC B0068: Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Roof Rail Module - Left High | B0068 | B0068 | B0062 | B0068 | B0061 |
Roof Rail Module - Left Low | B0068 | B0068 | B0062 | B0068 | B0061 |
Circuit/System Description
The driver roof rail deployment loop consists of an inflatable restraint roof rail module - left 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
B0061
The DTC will set when the roof rail module - left deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0062
This DTC will set will set when one of the following conditions occurs:
| • | Roof rail module - left high circuit is less than 2.4 volts and the roof rail module - left deployment loop is more than 6 ohms for 500 milliseconds. |
| • | Roof rail module - left deployment loop resistance is more than 4.8 ohms for 500 milliseconds. |
B0068
This DTC will set when one of the following conditions occur:
| • | Roof rail module - left high or low circuit is shorted to ground or short to voltage for 500 milliseconds. |
| • | Roof rail module - left high circuit is less than 2.4 volts and roof rail module - left 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. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
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 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.
• Left roof rail module • SDM • Left roof rail module wiring harness connector • SDM wiring harness connector
- Ignition OFF, disconnect harness connector at the left roof rail module.
- Use J 38715-30A to connect the J 38715-A to the harness side of the left roof rail module. Use the PASSENGER INFLATOR connector located on the load tool.
- Ignition ON, verify B0061, B0062, or B0068 is set current.
- Ignition OFF, disconnect and remove the J 38715-A .
- Disconnect the harness connector at the SDM.
- Test for infinite resistance between the left roof rail module control circuit terminal A and ground.
- Test for infinite resistance between the left roof rail module control circuit terminal B and ground.
- Ignition ON, test for less than 1 volt between the left roof rail module control circuit terminal A and ground.
- Test for less than 1 volt between the left roof rail module control circuit terminal B and ground.
- Ignition OFF, test for less then 1 ohm between the left roof rail module terminal A and SDM signal circuit terminal 13.
- Test for less then 1 ohm between the left roof rail module terminal B and SDM voltage circuit terminal 12.
- If all circuits test normal, replace the SDM.
| ⇒ | If B0051, B0052, or B0068 is history replace the left roof rail module. |
| ⇒ | If less than the specified value, test the circuit for a short to ground. |
| ⇒ | If less than the specified value, test the circuit for a short to ground. |
| ⇒ | 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 greater than the specified range, test the circuit for an open/high resistance. |
| ⇒ | If greater than the specified range, test the 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 |
