• | 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 provide an overview of each diagnostic category. |
Circuit | Short to Ground | Low Resistance | High Resistance | Open | Short to Voltage |
---|---|---|---|---|---|
LF Seat Belt Buckle Pretensioner - Low Control | B001A 02 | B001A 0E | B001A 0D | B001A 04 | B001A 01 |
LF Seat Belt Buckle Pretensioner - High Control | B001A 02 | B001A 0E | B001A 0D | B001A 04 | B001A 01 |
RF Seat Belt Buckle Pretensioner - Low Control | B001B 02 | B001B 0E | B001B 0D | B001B 04 | B001B 01 |
RF Seat Belt Buckle Pretensioner - High Control | B001B 02 | B001B 0E | B001B 0D | B001B 04 | B001B 01 |
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 seat belt buckle pretensioner - LF. 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 seat belt buckle pretensioner - LF connector which will short together both seat belt buckle pretensioner - LF high and low circuits when the connector is disconnected, this will help to prevent unwanted deployment of the inflator module during servicing.
Ignition voltage is between 9-16 volts.
The seat belt buckle pretensioner - LF high and/or low circuit is short to voltage for 120 milliseconds.
The seat belt buckle pretensioner - LF high and/or low circuit is short to ground for 120 milliseconds.
The seat belt buckle pretensioner - LF high and/or low circuit is open for 120 milliseconds.
The seat belt buckle pretensioner - LF deployment loop resistance is more than 3.9 ohms for 120 milliseconds.
The seat belt buckle pretensioner - LF deployment loop resistance is less than 1.1 ohms for 120 milliseconds.
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
• | The SDM will store a DTC, however if an event occurs the system will still attempt deployments. |
• | The condition for setting the DTC no longer exists. |
• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
SIR System Description and Operation
Control Module References for scan tool information
Each inflatable restraint module requires a specific adapter to connect the load tool to the SIR system.
• | J 38715-A Driver and Passenger SIR Load Tool |
• | J-38715-30A SIR Load Tool Adapter |
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 seat belt buckle pretensioner |
• | 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.
⇒ | If the above condition is not found, make the appropriate repair. |
⇒ | 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 LF inflatable restraint seat belt buckle pretensioner, and cycle the ignition ON. If the DTC resets after reconnecting the pretensioner, replace the LF inflatable restraint seat belt buckle pretensioner. |
⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for SDM replacement, setup, and programming |