GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Optra 🢒 DTC 🢒 DTC B1370

Circuit Description

When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within the SDM itself.

These test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deployment loops.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1370 Passenger Pretensioner Deployment Loop Short to Battery

Conditions for Running the DTC

Ignition voltage is within the normal operating voltage range.

Conditions for Setting the DTC
    • The belt pretensioner wiring of the passenger high is shorted to battery wiring.
    • The belt pretensioner wiring of the passenger low is shorted to battery wiring.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Step

Action

Values

Yes

No

Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section.

Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section.

Schematic Reference: SIR Schematics

Connector End View Reference: Component Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Confirm the ignition switch is OFF and the sensing and diagnostic module (SDM) has been removed.
  2. Wait for 1 minute to discharge the SDM charger.

Has the SDM discharged?

--

Go to Step 3

--

3

Visually inspect the connector and the wiring of the air bag.

Is the air bag wiring damaged?

--

Go to Step 7

Go to Step 4

4
  1. Confirm the ignition switch is OFF.
  2. Disconnect the passenger belt pretensioner connector.
  3. Disconnect the SDM connector.
  4. Measure the resistance between the high, low wiring of the passenger belt pretensioner and power.

Is the resistance equal to the specified value?

∞

Go to Step 5

Go to Step 7

5
  1. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  2. Confirm the ignition switch is ON.
  3. Erase the DTC using the scan tool.
  4. Perform the Diagnostic System Check - Vehicle .

Is the DTC removed?

--

Go to Step 8

Go to Step 6

6

Replace the passenger belt pretensioner. Refer to Front Seat Belt Replacement .

Is the replacement complete?

--

Go to Step 8

--

7

Replace the air bag wiring.

Is the replacement complete?

--

Go to Step 8

--

8
  1. Reconnect all SIR components.
  2. Verify that all components, connectors and connector position assurances (CPAs) are properly mounted.
  3. Use the scan tool in order to clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK