Circuit Description
The passenger deployment loop consists of a dual stage inflatable restraint instrument panel (I/P) module. The I/P module high circuits, and the I/P module low circuits exist for both stages 1 and 2. There are 2 shorting bars used within the I/P module connector. These shorting bars short together the I/P module stage 1 high circuits, and low circuits, and the I/P module stage 2 high circuits and low circuits when the connector is disconnected. This prevents unwanted deployment of the inflator module during servicing. During a 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 I/P module. 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:
| • | DTC B0012 Right Front/Passenger Frontal Deployment Loop (stage 2) Resistance Low |
| • | DTC B0013 Right Front/Passenger Frontal Deployment Loop (stage 2) Open |
| • | DTC B0014 Right Front/Passenger Frontal Deployment Loop (stage 2) Voltage Out of Range |
| • | DTC B0016 Right Front/Passenger Frontal Deployment Loop (single stage or stage 1) Resistance Low |
| • | DTC B0017 Right Front/Passenger Frontal Deployment Loop (single stage or stage 1) Open |
| • | DTC B0018 Right Front/Passenger Frontal Deployment Loop (single stage or stage 1) Voltage Out of Range |
Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.
Conditions for Setting the DTC
| • | DTC B0012 (stage 2) or B0016 (stage 1) will set when the I/P module deployment loop resistance is less than 1.3 ohms for 500 milliseconds. |
| • | DTC B0013 (stage 2) or B0017 (stage 1) will set when one of the following conditions occurs: |
| - | The I/P module high circuit is less than 2.4 volts and the I/P module deployment loop is more than 6 ohms for 500 milliseconds. |
| - | The I/P module deployment loop resistance is more than 4.8 ohms for 500 milliseconds. |
| • | DTC B0014 (stage 2) or B0018 (stage 1) will set when one of the following conditions occur: |
| - | The I/P module high circuits and/or low circuits is short-to-ground, or short-to-voltage for 500 milliseconds. |
| - | The I/P module high circuit is less than 2.4 volts and I/P module 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
| • | The condition responsible for setting the DTC is not currently present, 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 I/P module stage 1 or stage 2, high and low circuits. |
| • | An open or a high resistance in the I/P module stage 1 or stage 2, high or low circuits. |
| • | A short to ground or a short to voltage in the I/P module stage 1 or stage 2, high or low circuits. |
| • | A malfunctioning I/P module connector |
| • | A malfunctioning SDM connector |
| • | A malfunctioning I/P 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.
-
This step tests if the malfunction is caused by the I/P module.
-
This step determines which DTCs are present. If DTC B0012 or B0016 is present, test the I/P module for a short between high circuits and low circuits in stage 1 or stage 2. If DTC B0013 or B0017 is present, test the I/P module high circuits and low circuits for an open and for high resistance in stage 1 or stage 2. If DTC B0014 or B0018 is present, test the I/P module high and low circuits for a short-to-ground, and for a short-to-voltage in stage 1 or stage 2.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | |||
1 | Did you perform a Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does connector exhibits any signs of damage or corrosion? | Go to Step 3 | Go to Step 4 |
3 |
Did you complete the repair? | Go to Step 9 | -- |
Important: When installing J 38715-A SIR Driver/Passenger Load Tool for testing the dual stage I/P module, the correct 4-way load tool adapter connector must be used. Failure to use the correct 4-way load tool connector will set additional codes when testing. Does the scan tool indicate that DTC B0012, B0013, B0014, 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 |
