B0059

CIRCUIT DESCRIPTION
The inflatable restraint seat belt pretensioner-RF deployment loop consists of a seat belt pretensioner, seat belt pretensioner high control circuit, and seat belt pretensioner low control circuit. A shorting bar is used within the seat belt pretensioner connector which will short together the seat belt pretensioner high and seat belt pretensioner low control circuits when the connector is disconnected. This will help to prevent unwanted deployment of the pretensioner during servicing. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (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 1 voltage is within the normal operating voltage range.

CONDITIONS FOR SETTING THE DTC
- DTC B0057 will set when the SDM detects the seat belt pretensioner-RF deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
- DTC B0058 will set when one of the following conditions occurs:
- The SDM detects the seat belt pretensioner-RF high control is less than 2.4 volts and seat belt pretensioner-RF deployment loop resistance is 6 ohms or greater for 500 milliseconds.
- The SDM detects the seat belt pretensioner-RF deployment loop resistance is greater than 4.8 ohms for 500 milliseconds.
- DTC B0059 when one of the following conditions occur:
- The SDM detects the seat belt pretensioner-RF high control is greater than 6 volts for 500 milliseconds.
- The SDM detects the seat belt pretensioner-RF high control is less than 2.4 volts and seat belt pretensioner-RF 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.

CONDITIONS FOR CLEARING THE DTC
- The condition responsible for setting the DTC no longer exists.
- You issue a scan tool CLEAR DTCs command.
- A history DTC will clear once 255 malfunction free ignition cycles have occurred.

DIAGNOSTIC AIDS
The following can cause an intermittent condition:
- A short between the seat belt pretensioner-RF high and low control circuits
- An open or a high resistance in the seat belt pretensioner-RF high or low control circuits
- A malfunctioning shorting bar on the seat belt pretensioner-RF connector

Refer to Diagnostic Aids for Circuit Testing and Wiring Repair Procedures.

TEST DESCRIPTION

Steps 1-4:

Steps 5-9:

The numbers below refer to the step numbers on the diagnostic table.
2. Inspects the seat belt pretensioner-RF in-line connector.
4. Tests for a malfunctioning seat belt pretensioner-RF.
6. Tests for current DTCs. If DTC B0057 is present, test for a short between the seat belt pretensioner-RF high and seat belt pretensioner-RF low control circuits. If DTC B0058 is present, test for an open or high resistance between the seat belt pretensioner-RF high and seat belt pretensioner-RF low control circuits. If DTC B0059 is present, test for a short to ground or voltage between the seat belt retensioner-RF high and seat belt pretensioner-RF low control circuits.