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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 SLS 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 DTC B0023

Circuit Description

Passenger roof rail deployment loop is composed of the following parts:

    • Inflatable Restraint Roof Rail Module - Right
    • Right roof rail module high control
    • Right roof rail module low control

Shorting bars are used in roof rail module connector. When the connector is disconnected, the shorting bar shorts the right roof rail module high and low control, which helps to prevent accidental deployment of the inflation module during servicing. During a side or frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the airbag of the roof rail module. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. Any DTC detected will be stored in the memory.

DTC Descriptor

The diagnostic procedure supports the following DTC:

DTC B0023 Right Roof Rail Deployment Loop

The vehicle has DTCs including the DTC symptoms. Refer to DTC Symptom Description for DTC information.

DTC Symptom

DTC Symptom Descriptor

01

Short to battery

02

Short to ground

04

Open circuit

0D

Resistance above threshold

0E

Resistance below threshold

Conditions for DTC to Set

Ignition voltage is within normal operating range.

Conditions for DTC to Set

B0023 01

The right roof rail module high and/or low circuit is short to voltage for 120 milliseconds.

B0023 02

The right roof rail module high and/or low circuit is short to ground for 120 milliseconds.

B0023 04

The right roof rail module high and/or low circuit is open for 120 milliseconds.

B0023 0D

The right roof rail module deployment loop resistance is more than 3.9 ohms for 120 milliseconds.

B0023 0E

The right roof rail module deployment loop resistance is less than 1.1 ohms for 120 milliseconds.

Actions Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON via GMLAN serial data communications.

Conditions for Clearing the MIL/DTC
    • When conditions for the DTC to set no longer exist, use CLEAR DTC function of the scan tool to clear the DTC.
    • After 255 consecutive warm-up cycles without failure, the DTC will be cleared.

Diagnostic Aids

The following may be the possible causes for the fault:

    • The right roof rail module high and/or low circuit is short circuited.
    • The right roof rail module high and/or low circuit has high resistance.
    • The right roof rail module high and/or low circuit is short to ground or voltage.
    • Right roof rail module connector
    • The SDM harness connector
    • Right roof rail module fault
    • The SDM module fault

Thoroughly inspect the wiring and connectors. Failure to do so may result in error of diagnosis and the trouble may occur again even when you replace the parts. If there is intermittent conditions, refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The following numbers are corresponding to the steps in the diagnostic table.

  1. Test if the trouble is caused by the right roof rail module.

    2.

  2. Test to verify the set DTCs. If DTC B0023 01 is set, test if the right roof rail module high or low control is short to battery voltage. If DTC B0023 02 is set, test if the right roof rail module high or low control is short to ground. If DTC B0023 04, 0D, 0E is set, test if the right roof rail module high or low control is open or has high or low resistance.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

Connector End View Reference: SIR Connector End Views

1

Have you conducted Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Turn the ignition switch to OFF position.
  2. Disconnect the right roof rail module inline connector. Refer to Inflatable Restraint Roof Side Rail Module Replacement - Right Side .
  3. Check the right roof rail module inline connector to see if there is damage or corrosion at the components or harness that may result in the fault. Refer to Testing for Intermittent Conditions and Poor Connections .

Is there damage or corrosion in the connectors?

Go to Step 3

Go to Step 4

3
  1. If the right roof rail module connector is damaged, replace the right roof rail module. Refer to Inflatable Restraint Roof Side Rail Module Replacement - Right Side .
  2. If the right roof rail module connector harness is damaged, replace the harness of the connector. Refer to Connector Repairs .

Is the trouble corrected?

Go to Step 9

--

4

  1. Use J 38715-30A Adaptor, connect J 38715-A Airbag Driver/Passenger Load Special Tool to the right roof rail module coil connector harness. Use the passenger inflator connector.
  2. Engine off, ignition on.

    3. Important: J-45289 CANdi Module must be used together with the scan tool.

  3. Install the scan tool in order to display the SIR DTCs.

Does the scan tool indicate DTC B0023 as current trouble code?

Go to Step 5

Go to Step 7

5
  1. Turn the ignition switch to OFF position.
  2. Disconnect and remove J 38715-A and the adaptor.
  3. Disconnect the SIR system sensing and diagnostic module (SDM) connector. Refer to Control Module References for replacement, setup, and programming.
  4. Check if there is damage or corrosion to the SDM connector, which may result in trouble in right roof rail module high and/or low control circuits. Refer to Testing for Intermittent Conditions and Poor Connections .

Did you find and correct the condition?

Go to Step 9

Go to Step 6

6

  1. If DTC B0023 01 is set, test if the right roof rail module high or low control is short to battery voltage.
  2. If DTC B0023 02 is set, test if the right roof rail module high or low control is short to ground.
  3. If DTC B0023 04, 0D, 0E is set, test if the right roof rail module high or low control is open or has high or low resistance. Refer to Circuit Testing and Wiring Repairs for all the above situations.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7
  1. Turn the ignition switch to OFF position.
  2. Replace the right roof rail module. Refer to Inflatable Restraint Roof Side Rail Module Replacement - Right Side .

Have you finished the replacement?

Go to Step 9

--

8
  1. Turn the ignition switch to OFF position.
  2. Replace the SDM module. Refer to Control Module References for replacement, setup, and programming.

Have you finished the replacement?

Go to Step 9

--

9
  1. Connect all SIR components.
  2. Engine off, ignition on.
  3. Clear away all DTCs with scan tool.
  4. Operate the vehicle under conditions when DTC runs as specified in supporting documents.

Does the DTC set again?

Go to Step 2

System OK