DTC B0026 LF/Driver Frontal Deployment Loop (Single Stage or Stage 1) Open. Chevrolet Venture Ext. 2000

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2000 🢒 Venture Ext. 🢒 Restraints 🢒 SIR 🢒 DTC B0026 LF/Driver Frontal Deployment Loop (Single Stage or Stage 1) Open

SIR Components
Power, Ground, DLC, and SIR Lamp
Handling ESD Sensitive Parts Notice
SIR Caution

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

Deployment loop voltage out of range test:

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

•	Driver frontal deployment loop is not shorted to voltage.

•	Driver frontal high terminal A6 is less than 2 volts.

Deployment loop resistance measurement test:

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

•	Driver frontal deployment loop is not shorted to voltage.

•	Driver frontal deployment loop is not shorted to ground.

Conditions for Setting the DTC

Deployment loop voltage out of range test - Driver frontal deployment loop resistance is at least 6 ohms for 300 milliseconds.

Deployment loop resistance measurement test - Driver frontal deployment loop resistance is more than 4.8 ohms for 300 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

•	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:

•	The inflatable restraint steering wheel module yellow 2-way connector.

•	The inflatable restraint steering wheel module coil yellow 2-way connector.

•	The SDM wiring harness connector.

•	The wire to terminal connections in the driver frontal high circuit.

•	The wire to terminal connections in the driver frontal low circuit.

•	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.

This step checks the inflatable restraint steering wheel module coil yellow 2-way connector.

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

This step checks the SDM wiring harness connector.

This step checks to see if there is an open or a high resistance in the driver frontal high circuit.

This step determines if there is an open or a high resistance in the driver frontal low circuit or if there is a malfunctioning SDM.

Step

Action

Value(s)

Yes

Did you perform A Diagnostic System Check - SIR?

Go to Step 2

Go to Diagnostic System Check - SIR

Turn OFF the ignition.
Disconnect the inflatable restraint steering wheel module coil yellow 2-way connector. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement .
Inspect the component and harness sides of the inflatable restraint steering wheel module coil yellow 2-way connector for the following conditions:

•

Corrosion

•	Damaged terminals

•	Poor connections/terminal tension

Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Does either the component or harness side of the inflatable restraint steering wheel module coil yellow 2-way connector exhibit any signs of corrosion, terminal damage, or poor connections?

Go to Step 3

Go to Step 4

If the component side of the inflatable restraint steering wheel module coil yellow 2-way connector is damaged, the inflatable restraint steering wheel module coil must be replaced.
If the harness side of the inflatable restraint steering wheel module coil yellow 2-way connector is damaged, replace the harness side of the connector. Refer to Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

Reconnect the inflatable restraint steering wheel module coil yellow 2-way connector.
Verify that the connector position assurance (CPA) is properly installed.
Turn ON the ignition, with the engine OFF.
Use the scan tool to request the SIR DTC display.

Does the scan tool indicate that this DTC is current?

Go to Step 5

Go to Diagnostic Aids

Turn OFF the ignition.
Use the J 38715-90 adaptor to connect the J 38715-A SIR Driver/Passenger Load Tool BASE OF COLUMN connector to the harness side of the inflatable restraint steering wheel module coil yellow 2-way connector.
Turn ON the ignition, with the engine OFF.
Use the scan tool to request the SIR DTC display.

Does the scan tool indicate that this DTC is current?

Go to Step 9

Go to Step 6

Turn OFF the ignition.
Disconnect the J 38715-A .
Reconnect the inflatable restraint steering wheel module coil yellow 2-way connector.
Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
Use the J 38715-30A to connect the J 38715-A to the upper inflatable restraint steering wheel module coil connector on top of the steering column.
Turn ON the ignition, with the engine OFF.
Use the scan tool to request the SIR DTC display.

Does the scan tool indicate that this DTC is current?

Go to Step 8

Go to Step 7

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

Did you complete the replacement?

Go to Step 16

Turn OFF the ignition.
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 16

Turn OFF the ignition.
Remove the J 38715-A .
Disconnect the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
Inspect the SDM wiring harness connector for the following conditions:

•

Corrosion

•	Damaged terminals

•	Poor connections/terminal tension

Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Does the SDM wiring harness connector exhibit any signs of corrosion, terminal damage, or poor connections?

Go to Step 10

Go to Step 11

Replace the SDM wiring harness connector. Refer to Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

Zero the J 39200 Digital Multimeter (DMM).
Use the DMM to measure the resistance of the driver frontal high circuit.

Does the resistance measure less than the specified value?

0.5 ohms

Go to Step 13

Go to Step 12

Locate and repair the open or the high resistance in the driver frontal high circuit. Refer to Circuit Testing and Wiring Repairs in Wiring systems.

Did you complete the repair?

Go to Step 16

Use the DMM to measure the resistance of the driver frontal low circuit.

Does the resistance measure less than the specified value?

0.5 ohms

Go to Step 15

Go to Step 14

Locate and repair the open or the high resistance in the driver frontal low circuit. Refer to Circuit Testing and Wiring Repairs in Wiring systems.

Did you complete the repair?

Go to Step 16

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

Did you complete the replacement?

Go to Step 16

Reconnect all SIR components.
Verify that all components and connectors are properly mounted.
Turn ON the ignition, with the engine OFF.
Use the scan tool in order to clear the DTCs.

Did you complete the action?

Go to Diagnostic System Check - SIR