DTC B0109, B0110, or B0111. Buick Terraza 2008

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2008 🢒 Terraza 🢒 DTC 🢒 DTC B0109, B0110, or B0111

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

•	DTC B0109 Left Rear Side Deployment Loop Resistance Low

•	DTC B0110 Left Rear Side Deployment Loop Open

•	DTC B0111 Left Rear Side Deployment Loop Voltage Out of Range

Diagnostic Fault Information

Circuit	Short to Ground	Low Resistance	High Resistance	Open	Short to Voltage
Side Impact Module - Left Rear - Low Control	--	--	B0110, B0111	B0110	B0111
Side Impact Module - Left Rear - High Control	B0111	B0109	B0110, B0111	B0110	B0111

Circuit Description

The driver side deployment loop consists of the following components:

•	An inflatable restraint side impact module LR

•	The side impact module LR high circuits

•	The side impact module LR low circuits

A shorting bar is used within the side impact module LR connector. The shorting bar will short together the side impact module LR high circuit and the side impact module LR low circuit when the connector is disconnected. This helps prevent unwanted deployment of the inflator 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. This flow of current will deploy the side impact module LR. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory.

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

DTC B0109

The SDM detects the LR side impact module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.

DTC B0110

•	The SDM detects the LR side impact module deployment loop resistance is greater than 4.8 ohms for 500 milliseconds.

•	The SDM detects the voltage at the LR side impact module high control is less than 2.4 volts and LR side impact module deployment loop resistance is 6 ohms or greater for 500 milliseconds.

DTC B0111

•	The SDM detects the voltage at the LR side impact module high control is greater than 6 volts for 500 milliseconds.

•	The SDM detects the voltage at the LR side impact module high control is less than 2.4 volts and the LR side impact module deployment loop resistance is less than 6 ohms for 500 milliseconds.

Action Taken When the DTC Sets

The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

Conditions for Clearing the DTC

•	The condition for setting the DTC no longer exists.

•	A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

•	Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Special Tools

•	J 38715-A SIR Driver/Passenger Load Tool

•	SA9409Z-A SIR Driver/Passenger Load Tool

Circuit/System Testing

Important: Refer to SIR Service Precautions. When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

•	Inflatable restraint side impact module

•	SDM module

•	Inflatable restraint side impact module wiring harness connector

•	SDM wiring harness connector

Ignition OFF, disconnect the harness connector at the LR inflatable restraint side impact module.
With the appropriate adaptor, connect J 38715-A in place of the inflatable restraint side impact module.
Ignition ON, verify the DTC is set as current.

⇒	If DTC is not set or is set as history, replace the inflatable restraint side impact module.

Ignition OFF, disconnect J 38715-A and the adaptor. Disconnect the harness connector at the SDM.
Ignition ON, test for less than 1 volt between the high control circuit terminal 25 and ground.

⇒	If greater than the specified range, test the high control circuit for a short to voltage.

Test for less than 1 volt between the low control circuit terminal 24 and ground.

⇒	If greater than the specified range, test the low control circuit for a short to voltage.

Ignition OFF, test for infinite resistance between the high control circuit terminal 25 and ground.

⇒	If less than the specified value, test the control circuit for a short to ground.

Test for infinite resistance between the appropriate low control circuit terminal 24 and ground.

⇒	If less than the specified value, test the control circuit for a short to ground.

Test for less than 1 ohm on the high control circuit between the impact module terminal A and the SDM terminal 25.

⇒	If greater than the specified range, test the control circuit for an open/high resistance.

Test for less than 1 ohm on the low control circuit between the impact module terminal B and the SDM terminal 24.

⇒	If greater than the specified range, test the control circuit for an open/high resistance.

If all circuits test normal, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Rear Seat Body Side Inflatable Restraint Module Replacement

•	SIR/SRS Wiring Repairs

•	Control Module References for SDM replacement, setup, and programming