GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 Epica 🢒 Restraints 🢒 SIR 🢒 DTC 024

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.

Upon passing this 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 deploy loops.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC 024 Battery Voltage Low

Conditions for Running the DTC

Ignition voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The voltage supplied from the battery is lower than 10.6 volts.

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

Schematic Reference: SIR Schematics

Connector End View Reference: SIR Connector End Views

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.

1

Did you perform a Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Inspect the fuse F8.

Is the fuse open?

--

Go to Step 3

Go to Step 4

3

Replace the fuse F8.

Did you complete the replacement?

--

Go to Step 11

--

4
  1. Turn the ignition ON.
  2. Measure the voltage at the fuse F8.

Does the voltage measure less than specified?

10.6 V

Go to Step 5

Go to Step 6

5

Repair the power supply to the fuse F8.

Did you complete the repair?

--

Go to Step 11

--

6
  1. Turn the ignition OFF.
  2. Disconnect the connector at the sensing and diagnostic module (SDM).
  3. Turn the ignition ON.
  4. Measure the voltage at the terminal 5 of the SDM connector.

Does the voltage measure less than specified?

10.6 V

Go to Step 8

Go to Step 7

7

Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Did you complete the repair?

--

Go to Step 11

--

8
  1. Disconnect the connector C213.
  2. Turn the ignition ON.
  3. Measure the voltage on the terminal 6 of the connector C213.

Does the voltage measure less than specified?

10.6 V

Go to Step 10

Go to Step 9

9

Replace the SIR wiring harness.

Did you complete the repair?

--

Go to Step 11

--

10

Repair the open circuit between the fuse F8 and the connector C213.

Did you complete the repair?

--

Go to Step 11

--

11
  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