DTC B0022 LF/Driver Frontal Deployment Loop (Single Stage or Stage 1) Resistance Low. Buick Regal 1999

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1999 🢒 Regal 🢒 Restraints 🢒 SIR 🢒 DTC B0022 LF/Driver Frontal Deployment Loop (Single Stage or Stage 1) Resistance Low

SIR Components
SIR Schematics
SIR Caution
Handling ESD Sensitive Parts Notice

Circuit Description

When you first turn the ignition switch to the RUN position, 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 Setting the DTC

•	Ignition 1 voltage is within the normal operating voltage range.

•	Driver frontal deployment loop is not open.

•	Driver frontal deployment loop is not shorted to voltage.

•	Driver frontal deployment loop is not shorted to ground.

•	Driver frontal deployment loop resistance is less than 1.3 ohms for 300 milliseconds.

The driver frontal deployment loop consists of the following components:

•	Inflatable restraint steering wheel module.

•	Inflatable restraint steering wheel module coil.

•	Harness wiring of CKT 347.

•	Harness wiring of CKT 348.

•	Connector terminal contact.

This malfunction is detected during the deployment loop resistance measurement test.

Action Taken When the DTC Sets

•	The SDM sets a DTC B0022.

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

Conditions for Clearing the DTC

•	Current DTC

The resistance of the driver frontal deployment loop is at least 1.3 ohms or more for 300 milliseconds.

•	History DTC

-	You issue a scan tool CLEAR CODES command.

-	Once 250 malfunction free ignition cycles have occurred.

Diagnostic Aids

The following can cause an intermittent condition:

•	A short between CKT 347 and CKT 348.

•	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 side of inline connector C215.

Test Description

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

This step checks the inline connector C215.

This step determines if the inflatable restraint steering wheel module coil or if the inflatable restraint steering wheel module is defective.

This step determines if there is a short between CKT 347 and CKT 348 or if there is a malfunctioning SDM.

DTC B0022 Driver Frontal Deployment Loop Resistance Low

Step	Action	Value(s)	Yes	No
1	Was the SIR Diagnostic System Check performed?	--	Go to Step 2	Go to SIR Diagnostic System Check
2	Turn the ignition switch to the OFF position. Disconnect inline connector C215. Check the wiring harness side of inline connector C215 for corrosion or damaged terminals. Is the wiring harness connector OK?	--	Go to Step 4	Go to Step 3
3	Replace the wiring harness side of inline connector C215. Refer to Wiring Repair . Is the repair complete?	--	Go to Step 12	--
4	Reconnect inline connector C215. Make sure that the connector position assurance (CPA) is properly installed. Turn the ignition switch to the RUN position. Use the scan tool to request the SIR DTC display. Is DTC B0022 current?	--	Go to Step 5	Go to Step 3
5	Turn the ignition switch to the OFF position. Disconnect inline connectors C215 and C216. Install the J 38715-A SIR Driver/Passenger Load Tool to the wiring harness side of inline connectors C215 and C216. Use the J 38715-5 adaptor for inline C216 and the J 38715-90 adaptor for inline connector C215. Turn the ignition switch to the RUN position. Use the scan tool to request the SIR DTC display. Is DTC B0022 current?	--	Go to Step 9	Go to Step 6
6	Turn the ignition switch to the OFF position. Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement . Disconnect the J 38715-A from inline connector C215. Connect inline connector C215 back together. Connect the J 38715-A to the upper inflatable restraint steering wheel module coil connector on the steering column. Use the J 38715-30 adaptor for the upper coil connector. Turn the ignition switch to the RUN position. Use the scan tool to request the SIR DTC display. Is DTC B0022 current?	--	Go to Step 8	Go to Step 7
7	Turn the ignition switch to the OFF position. Replace the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement . Is the repair complete?	--	Go to Step 12	--
8	Turn the ignition switch to the OFF position. Replace the inflatable restraint steering wheel module coil. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement . Is the repair complete?	--	Go to Step 12	--
9	Turn the ignition switch to the OFF position. Disconnect the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Disconnect the J 38715-A . Use the J 39200 Digital Multimeter (DMM) to measure the resistance between terminal A6 and terminal A7 of the SDM wiring harness connector. Is the measured resistance less than the specified value?	OL	Go to Step 10	Go to Step 11
10	Locate a short between CKT 347 and CKT 348. Repair the short between CKT 347 and CKT 348. Is the repair complete?	--	Go to Step 12	--
11	Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete?	--	Go to Step 12	--
12	Reconnect all SIR components. Make sure that all components and connectors are properly mounted. Turn the ignition switch to the RUN position. Use the scan tool to clear all current and history SIR DTCs. Have all current and history SIR DTCs been cleared?	--	Go to SIR Diagnostic System Check	--