GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Vivant 🢒 Restraints 🢒 SIR 🢒 DTC 065

Circuit Description

When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform tests to diagnose critical malfunctions within itself. After passing these tests, Ignition 1 and deployment loop voltages are measured to ensure that they are within their respective normal voltage ranges. The SDM then proceeds with the resistance measurement test. Left side belt pretensioner low terminal B2 is grounded through a current sink, and the left side belt pretensioner current source is connected to the left side belt pretensioner high terminal to allow a known amount of current to flow. By monitoring the voltage difference between left side belt pretensioner high and left side belt pretensioner low, the SDM calculates the combined resistance of the left side belt pretensioner inflator module, the harness wiring, and the connector terminal contacts.

Conditions for Setting the DTC
    • Resistance of the left side belt pretensioner deployment loop is higher than 4.5 ohms for 500 milliseconds.
    • Voltage at left side belt pretensioner high terminal is less than 2 volts and the resistance of the left side belt pretensioner is higher than or equal to 4.5 ohms for 500 milliseconds.
    • Ignition voltage is within the normal operation range.

Action Taken When the DTC Sets

The SDM will turn on the AIRBAG indicator and set a diagnostic trouble code DTC 65.

Conditions for Clearing the DTC
    •  Resistance of the left side belt pretensioner deployment loop is less than or equal to 4.5 ohms for 500 milliseconds.
    • Voltage at left side belt pretensioner high terminal is higher than 2 volts and the resistance of the left side belt pretensioner is less than 4.5 ohms for 500 milliseconds.
    • Turn Off the ignition switch.
    • The scan tool CLEAR CODES command received.

Diagnostic Aids

An intermittent condition is likely to be caused by a poor connection, at the left side belt pretensioner connector, connector C221, or at terminals B1 and B2 of the SDM. An open wire in the left side belt pretensioner deployment loop will also set DTC 65.

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

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

Step

Action

Values

Yes

No

1

Perform the Diagnostic System Check - Sir.

Is the Diagnostic System Check complete?

--

Go to Step 2

Go to Diagnostic System Check - SIR

2
  1. Turn OFF the ignition and remove the key.
  2. Disconnect the left side belt pretensioner airbag connector.
  3. Inspect the terminals for damage or improper connection.
  4. Repair any damaged pins or terminals on the wiring harness side of the connector. if the pigtail or connector of the belt pretensioner is damaged, the left side belt pretensioner must be replaced.
  5. If no damage was found, connect the left side belt pretensioner connector and make sure it is seated properly.
  6. Turn ON the ignition.

Is the DTC still displayed?

--

Go to Step 3

System OK

3
  1. Turn OFF the ignition and remove the key.
  2. Temporarily disconnect the left side belt pretensioner.
  3. Check terminals B1 and B2 at the SDM and terminal 3 and 4 at the C221.

Are there any loose wires or damaged pins or terminals?

--

Go to Step 4

Go to Step 5

4
  1. Repair the loose or damaged pins or SDM terminals.
  2. Make sure all SIR components are reconnected and all components are properly mounted.

Did you complete the repair?

--

Go to Diagnostic System Check - SIR

--

5

Check for an open circuit between the SDM and the left side belt pretensioner connector.

Refer to Diagnostic Illustration 21 in SIR Diagnostic Illustrations .

Is there an open circuit?

∞

Go to Step 6

Go to Step 7

6
  1. Repair the open circuit between the SDM and the left side belt pretensioner module.
  2. Make sure all SIR components are reconnected and all components are properly mounted.

Did you complete the repair?

--

Go to Diagnostic System Check - SIR

--

7
  1. Replace the SDM. The arrow must be pointing toward the front of the vehicle. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  2. Connect all SIR components, and ensure that all components are properly mounted.
  3. Perform the SIR Diagnostic System Check - SIR.

Is DTC 65 still current?

--

Go to Step 8

System OK

8
  1. Turn OFF the ignition and remove the key.
  2. Disconnect the connector at the left side belt pretensioner.
  3. Replace the left side belt pretensioner module.
  4. Make sure all SIR components are reconnected and all components are properly mounted.

Did you complete the repair?

--

Go to Diagnostic System Check - SIR

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