• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Seat Belt Pretensioner - RF High | B0059 | B0059 | B0058 | B0057 |
Seat Belt Pretensioner - RF Low | B0059 | B0059 | B0058 | B0057 |
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 pretensioner - RF. 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 pretensioner - RF connector which will short together both seat belt pretensioner - RF 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 pretensioner - RF deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
• | Seat belt pretensioner - RF high circuit is less than 2.4 volts and the seat belt pretensioner - RF deployment loop is more than 6 ohms for 500 milliseconds. |
• | Seat belt pretensioner - RF deployment loop resistance is more than 4.8 ohms for 500 milliseconds. |
• | Seat belt pretensioner - RF high and/or low circuits is shorted to ground or short to voltage for 500 milliseconds. |
• | Seat belt pretensioner - RF high circuit is less than 2.4 volts and seat belt pretensioner - RF deployment loop resistance is less than 6 ohms for 500 milliseconds. |
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
• | The SIR system is disabled and no deployments are allowed. |
• | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. |
• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
If there is more than one DTC set diagnose the open DTC first.
SIR System Description and Operation
Control Module References for scan tool information
J 38715-A Driver and Passenger SIR Load Tool
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 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 RF inflatable restraint seat belt pretensioner, and cycle the ignition ON. If the DTC resets after reconnecting the pretensioner, replace the RF inflatable restraint seat belt 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 |