DTC B0040, B0041, OR B0045 Circuit Description
The driver side deployment loop consists of the following components:
l An inflatable restraint side impact module -LF
l The inflatable restraint side impact module wiring harness
l The side impact module -LF high circuits
l The side impact module -LF low circuits
A shorting bar is used within the side impact module -LF connector. The shorting bar will short together the side impact module -LF high circuit, and the side impact module -LF 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 -LF. 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.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
l DTC B0040 Left Front Side Deployment Loop Resistance Low
l DTC B0041 Left Front Side Deployment Loop Open
l DTC B0045 Left Front Side Deployment Loop Voltage Out of Range
Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.
Conditions for Setting the DTC
l DTC B0040 will set when the side impact module -LF deployment loop resistance is
less than 1.3 ohms for 500 milliseconds. l DTC B0041 will set when one of the following conditions occurs: . Side impact module -LF high circuit is less than 2.4 volts and the side impact module -LF deployment loop is more than 6 ohms for 500 milliseconds. . Side impact module -LF deployment loop resistance is more than 4.8 ohms for 500 milliseconds. l DTC B0045 will set when one of the following conditions occur: . Side impact module -LF high and/or low circuits is short to ground or short to voltage for 500 milliseconds. . Side impact module -LF high circuit is less than 2.4 volts and side impact module -LF deployment loop resistance is less than 6 ohms for 500 milliseconds.
Action Taken When the DTC Sets
The SDM commands the AIR BAG indicator ON via class 2 serial data.
Conditions for Clearing the DTC
l The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. l A history DTC will clear once 255 malfunction-free ignition cycles have occurred.
Diagnostic Aids
The following are possible causes of the malfunction:
l A short between the side impact module -LF high and low circuits l An open or a high resistance in the side impact module -LF high or low circuits l A short to ground or a short to voltage in the side impact module -LF high or low
circuits l The side impact module -LF connector l The SDM connector
l A malfunctioning side impact module -LF l A malfunctioning SDM
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
5: This step tests to see if the malfunction is caused by the side impact module -LF or by the side impact module -LF wiring harness.
7: This step tests to see what DTCs are present. If DTC B0040 s present, test the side impact module -LF for a short between high and low circuits. If DTC B0041 is present, test the side impact module -LF high and low circuits for an open and for high resistance. If DTC B0045 is present, test the side impact module -LF high and low circuits for a short to ground or a short to voltage.
DTC B0040, B0041, or B0045
Step Action Yes No
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views
1 Did you perform the Diagnostic System Check -Vehicle? Go to Step 2 Go to Diagnostic System Check -Vehicle
2 1. Turn OFF the ignition. 2. Disconnect the side impact module -LF wiring harness in-line connector. Refer to Inflatable Restraint Side Impact Module Wiring Harness Replacement. 3. Inspect the component and harness sides of the in-line connector for the side impact module -LF wiring harness for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Does connector exhibits any signs of damage or corrosion? Go to Step 3 Go to Step 4
3 1. If the in-line connector for the side impact module -LF wiring harness is damaged, the side impact module -LF wiring harness must be replaced. Refer to Inflatable Restraint Side Impact Module Wiring Harness Replacement. 2. If the wiring harness side of side impact module -LF in-line connector is damaged, replace the harness side of the connector. Refer to Connector Repairs . Did you complete the repair? Go to Step 11 -
IMPORTANT: If scan tool displays multiple codes, diagnose the open code first. 1. Use J 38715-60 Adapter to connect the
4
5
6 7
J 38715-A Driver/Passenger SIR Load
Tool to the harness side of the side
impact module -LF wiring harness
connector. Use steering wheel and
passenger inflator connectors.
2. Turn ON the ignition, with the engine
OFF.
3. Use the scan tool to request SIR DTCs
displayed.
Does the scan tool indicate that DTC B0040,
B0041, or B0045 are current? Go to Step 6 Go to Step 5
1. Turn OFF the ignition.
2. Disconnect and remove the J 38715-A
and adapter.
3. Connect the side impact module -LF
wiring harness in-line connector.
4. Remove the side impact module -LF
connector. Refer to Inflatable
Restraint Side Impact Module
Replacement -Front.
5. Use J 38715-30A Adapter to connect the
J 38715-A to the side impact module -
LF connector. Use passenger inflator
connector.
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 DTC B0040,
B0041, or B0045 are current? Go to Step 9 Go to Step 8
1. Turn OFF the ignition.
2. Disconnect and remove both the J
38715-A and adapter.
3. Disconnect the inflatable restraint
sensing and diagnostic module (SDM)
connector. Refer to Control Module
References for replacement, setup, and
programming.
4. Inspect the SDM connector for damage
or corrosion that may cause a
malfunction in the side impact module
-LF high and/or low circuits. Refer
to Testing for Intermittent Conditions
and Poor Connections and Connector
8
9
10
Repairs .
Did you find and correct the condition?
1. If DTC B0040 is present, test the side impact module -LF circuits for a short between the high and low circuits.
2. If DTC B0041 is present, test the side impact module -LF high and low circuits for an open and for high resistance.
3. If DTC B0045 is present, test the side impact module -LF high and low circuits for a short to ground and for a short to voltage.
4. All the conditions refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
1. Turn OFF the ignition.
2. Replace the side impact module -LF. Refer to Inflatable Restraint Side Impact Module Replacement -Front.
Did you complete the replacement?
1. Turn OFF the ignition.
2. Replace the side impact module -LF wiring harness. Refer to Inflatable Restraint Side Impact Module Wiring Harness Replacement.
Did you complete the replacement?
1. Turn OFF the ignition.
2. Replace the SDM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
1. Connect all SIR components.
2. Turn ON the ignition, with the engine OFF.
3. Use the scan tool in order to clear the DTCs.
4. Operate the vehicle within the Conditions for Running the DTC as
Go to Step 11
Go to Step 11
Go to Step 11
Go to Step 11
Go to Step 11
Go to Step 7
Go to Step 10
-
-
-
specified in the supporting text. Does the DTC reset? Go to Step 2 System OK
