GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 Restraints 🢒 SIR 🢒 DTC 015

Circuit Description

The inflatable restraint steering wheel module deployment loop consists of the inflatable restraint steering wheel module, the inflatable restraint steering wheel module coil, and the steering wheel module high and steering wheel module low circuits. A shorting bar is used in the inflatable restraint steering wheel module coil which will short the steering wheel module high and steering wheel module low circuits when the connector is disconnected. This will prevent unwanted deployment of the steering wheel module during servicing. When the ignition is turned ON, the inflatable restraint sensing and diagnostic (SDM) performs continuous diagnostic tests on the deployment loop to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, the SDM will store a diagnostic trouble code (DTC).

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The measured leakage current to voltage is above the specified value in the steering wheel module deployment loop.

Action Taken When the DTC Sets

The SDM turns 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.
    • A history DTC will clear once 255 malfunction free ignition cycles have occurred.

Diagnostic Aids

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in misdiagnosis, causing a part replacement with the reappearance of the malfunction. The following are possible causes of the malfunction:

    • A short to voltage in the steering wheel module high or the steering wheel module low circuits
    • The steering wheel module upper coil connector
    • The steering wheel module coil connector
    • The SDM connector
    • An internal SDM malfunction

If an intermittent condition exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The numbers below refer to step numbers on the diagnostic table.

  1. Tests to see if the malfunction is intermittent.

    2.

  2. Tests to see if the malfunction is caused by the steering wheel module.

    3.

  3. Tests to see if the malfunction is caused by the steering wheel module coil.

    4.

  4. Tests to see if there is a short to voltage in the steering wheel module high or the steering wheel module low circuits.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

1

Did you perform A Diagnostic System Check - SIR?

Go to Step 2

Go to Diagnostic System Check - SIR

2
  1. Turn OFF the ignition.
  2. Remove the ignition key.
  3. Disconnect the steering wheel module upper coil connector. Refer to Inflatable Restraint Steering Wheel Module Replacement .
  4. Inspect the component and harness sides of the steering wheel module upper coil connector for damage or corrosion that may cause a short to voltage. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Does the steering wheel module upper coil connector exhibit any signs of damage or corrosion?

Go to Step 3

Go to Step 4

3
  1. If the component side of the steering wheel module upper coil connector is damaged, the steering wheel module must be replaced.
  2. If the harness side of the steering wheel module upper coil connector is damaged, the steering wheel module coil must be replaced.

Did you complete the replacement?

Go to Step 12

--

4

  1. Reconnect the steering wheel module upper coil connector.
  2. Verify that the connector position assurance (CPA) is properly installed.
  3. Install a scan tool.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the SIR DTC display.

Does the scan tool indicate that DTC 15 is current?

Go to Step 5

Go to Diagnostic Aids

5

  1. Turn OFF the ignition.
  2. Remove the ignition key.
  3. Disconnect the steering wheel module upper coil connector.
  4. Use the J 38715-30A adaptor to connect the J 38715-A SIR Driver/Passenger Load Tool STEERING COLUMN connector to the steering wheel module upper coil connector.
  5. Turn ON the ignition, with the engine OFF.
  6. With a scan tool, observe the SIR DTC display.

Does the scan tool indicate that DTC 15 is current?

Go to Step 7

Go to Step 6

6
  1. Turn OFF the ignition.
  2. Remove the ignition key.
  3. Replace the steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .

Did you complete the replacement?

Go to Step 12

--

7

  1. Turn OFF the ignition.
  2. Remove the ignition key.
  3. Remove the J 38715-A .
  4. Disconnect the steering wheel module coil connector. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement .
  5. Use the J 38715-40 adaptor to connect the J 38715-A SIR Driver/Passenger Load Tool BASE OF COLUMN connector to the steering wheel module coil connector.
  6. Turn ON the ignition, with the engine OFF.
  7. With a scan tool, observe the SIR DTC display.

Does the scan tool indicate that DTC 15 is current?

Go to Step 9

Go to Step 8

8
  1. Turn OFF the ignition.
  2. Remove the ignition key.
  3. Replace the steering wheel module coil. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement .

Did you complete the replacement?

Go to Step 12

--

9
  1. Turn OFF the ignition.
  2. Remove the ignition key.
  3. Remove the J 38715-A .
  4. Disconnect the SDM connector. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  5. Inspect the SDM connector for damage or corrosion that may cause a short to voltage. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

10

  1. Insert the J 42113 SIR Shorting Bar Tool into the SDM connector above the steering wheel module high and the steering wheel module low circuits.
  2. Test the steering wheel module high and the steering wheel module low circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

11

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

Did you complete the replacement?

Go to Step 12

--

12
  1. Reconnect all SIR components.
  2. Use the scan tool in order to clear the DTCs.
  3. 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