Circuit Description
The inflatable restraint IP module deployment loop consists of the inflatable restraint IP module, and the IP module high and low circuits. A shorting bar used within the IP module connector shorts together the IP module high and low circuits when the connector is disconnected. This helps to prevent unwanted deployment of the inflator module during servicing. During a frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) allows current to flow through the deployment loop in order to deploy the IP module. When the ignition is ON, 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 diagnostic trouble code (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 B0016 will set when the IP module deployment loop resistance is less than 1.3 ohms for 300 milliseconds. |
| • | DTC B0017 will set when one of the following conditions occurs: |
| - | IP module high circuit is less than 2 volts and the IP module deployment loop resistance is more than 3.7 ohms for 300 milliseconds. |
| - | IP module deployment loop resistance is more than 6 ohms for 300 milliseconds. |
| • | DTC B0018 will set when one of the following conditions occur: |
| • | IP module high and/or low circuits is short to ground or short to voltage for 300 milliseconds. |
| • | IP module high circuit is less than 2 volts and IP module deployment loop resistance is less than 6 ohms for 300 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
| • | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. |
| • | A history DTC will clear once 255 malfunction free ignition cycles have occurred. |
Diagnostic Aids
The following are possible causes of the malfunction:
| • | A short between the IP module high and low circuits. |
| • | An open or a high resistance in the IP module high or low circuits. |
| • | A short to ground or a short to voltage in the IP module high or low circuits. |
| • | The IP module connector |
| • | The SDM connector |
| • | A malfunctioning IP module |
| • | 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 in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Tests to see if the malfunction is caused by the IP module.
-
Tests to see what DTCs are present. If DTC B0016 is present, test the IP module for a short between high and low circuits. If DTC B0017 is present, test the IP module high and low circuits for an open and for high resistance. If DTC B0018 is present, test the IP module high and low circuits for a short to ground and for a short to voltage.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics | |||
1 | Did you perform the Diagnostic System Check - SIR? | Go to Step 2 | |
2 |
Does the connector exhibit any signs of damage or corrosion? | Go to Step 3 | Go to Step 4 |
3 |
Did you complete the repair? | Go to Step 9 | -- |
Does the scan tool indicate that DTC B0016, B0017, or B0018 are current? | Go to Step 5 | Go to Step 7 | |
5 |
Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
Did you find and correct the condition? | Go to Step 9 | Go to Step 8 | |
7 |
Did you complete the replacement? | Go to Step 9 | -- |
8 |
Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
