GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 DeVille 🢒 DTC 🢒 DTC B0022 LF/Driver Frontal Deployment Loop (Single Stage or Stage 1) Resistance Low

Object Number: 465543 Size: MF
SIR Components
SDM, Front and Rear Side Inflator Modules with Option AW9
SIR Handling Caution
Handling ESD Sensitive Parts Notice
SIR Schematic Icons

Circuit Description

When you first turn ON the ignition, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. Then the SDM performs the following continuous diagnostic tests on the deployment loops:

    • Deployment loop voltage out of range test
    • Deployment loop resistance measurement test

If the voltage out of range test detects a short to voltage condition, the resistance measurement test for that deployment loop will not be performed.

Conditions for Running the DTC
    • The ignition 1 voltage is within the normal operating voltage range.
    • The driver frontal deployment loop is not open.
    • The driver frontal deployment loop is not shorted to voltage.
    • The driver frontal deployment loop is not shorted to ground.

Conditions for Setting the DTC

The driver frontal deployment loop resistance is less than 1.3 ohms for 500 milliseconds.

Action Taken When the DTC Sets

The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.

Conditions for Clearing the DTC
    • The resistance of the driver frontal deployment loop is at least 1.3 ohms or more for 500 milliseconds.
    • You can issue a CLEAR CODES 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 driver frontal high and the driver frontal low circuits
    • A malfunctioning shorting bar on the inflatable restraint steering wheel module 2-way connector
    • A malfunctioning shorting bar on the inflatable restraint steering wheel module coil 2-way connector

If any of the above conditions are found refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. This step checks the in-line connector below the steering wheel restraint module coil.

    2.

  2. This step tests for the proper operation of the inflatable restraint steering wheel module coil and/or the inflatable restraint steering wheel inflator module.

    3.

  3. This step determines if there is a short between the driver frontal high and the driver frontal low circuits, or if there is a malfunctioning SDM.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - SIR

2

  1. Turn OFF the ignition.
  2. Disconnect the the in-line connector that connects the steering wheel restraint module coil to the vehicle wiring harness.
  3. Inspect both of the wiring harness connectors for the following conditions:
    4. • Corrosion
    • Terminal damaged
    • Poor connections/terminal tension
  4. If any of the above conditions are found refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Do the connectors exhibit any signs of corrosion, terminal damaged, or poor connections?

--

Go to Step 3

Go to Step 4

3
  1. Replace the wiring harness side of the in-line connector. Refer to Connector Repairs in Wiring Systems.
  2. If the steering wheel restraint module coil exhibits any of the above conditions, the module must be replaced. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement .

Did you complete the replacement?

--

Go to Step 12

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4
  1. Reconnect the in-line connector.
  2. Verify that the connector position assurance (CPA) is properly installed.
  3. Turn ON the ignition, with the engine OFF.
  4. Use the scan tool to request SIR DTCs displayed.

Does the scan tool indicate that this DTC is current?

--

Go to Step 5

Go to Diagnostic Aids

5
  1. Turn OFF the ignition.
  2. Disconnect the in-line connector below the steering wheel restraint module coil.
  3. Install the J 38715-A SIR Load Tool to the vehicle wiring harness in-line connector. Use the appropriate wiring harness connector adaptors where necessary.
  4. Turn ON the ignition, with the engine OFF.
  5. Use the scan tool to request SIR DTCs displayed.

Does the scan tool indicate that this DTC is current?

--

Go to Step 9

Go to Step 6

6

  1. Turn OFF the ignition.
  2. Remove the inflatable restraint steering wheel inflator module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
  3. Disconnect the J 38715-A from the in-line connector.
  4. Reconnect the in-line connector back together.
  5. Install the J 38715-A to the upper inflatable restraint steering wheel module coil connector on the steering column.
  6. Turn ON the ignition, with the engine OFF.
  7. Use the scan tool to request SIR DTCs displayed.

Does the scan tool indicate that this DTC is current?

--

Go to Step 8

Go to Step 7

7
  1. Turn OFF the ignition.
  2. Replace the inflatable restraint steering wheel inflator module. Refer to Inflatable Restraint Steering Wheel Module Replacement .

Did you complete the replacement?

--

Go to Step 12

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8
  1. Turn OFF the ignition.
  2. Replace the inflatable restraint 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. Disconnect the inflatable restraint sensing and diagnostic module (SDM) wiring harness connector. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  3. Disconnect the J 38715-A .
  4. Use the J 39200 DMM and measure the resistance between the driver frontal high and the driver frontal low deployment circuits of the SDM wiring harness connector.

Does the resistance measure less than the specified value?

OL

Go to Step 10

Go to Step 11

10

Locate and repair a short between the driver frontal high and the driver frontal low deployment circuits of the SDM wiring harness connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 12

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11

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

Did you complete the replacement?

--

Go to Step 12

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12
  1. Reconnect all of the SIR components.
  2. Verify that all of the components and the connectors 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.

Did you complete the action?

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Go to Diagnostic System Check - SIR

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