Diagnostic Instructions

DTC Descriptors

DTC B0061: Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Resistance Low

DTC 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 Control	B0068	B0068	B0062	B0068	B0061
Roof Rail Module - Left Low Control	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 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

B0061

DTC B0061 will set when the roof rail module-left deployment loop resistance is less than 1.3 ohms for 500 milliseconds.

B0062

DTC B0062 will set when one of the following conditions occurs:

B0068

DTC B0068 will set when one of the following conditions occur:

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

Circuit/System Testing

Important: Refer to SIR Service Precautions .

When removing the connectors, inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:

•	Inflatable restraint module

•	SDM module

•	Front end sensor 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 LF inflatable restraint side impact module 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 left roof rail inflatable restraint module.
3. With the appropriate load tool adapter, connect J 38715-A in place of the left roof rail inflatable restraint module.
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 left roof rail inflatable restraint module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the left roof rail inflatable restraint module.

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 16 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 17 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 16 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 17 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 terminal 4 and the SDM terminal 16.

⇒	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 terminal 3 and the SDM terminal 17.

⇒	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 after completing the diagnostic procedure.