The inflatable restraint IP module deployment loop consists of a dual stage inflatable restraint IP module, the IP module stage 1 highcircuit, and the IP module stage 1 low circuit. A shorting bar is used in the inflatable restraint IP module connector which shorts together the IP module stage 1 high and IP module stage 1 low circuits when the connector is disconnected. This will help prevent unwanted deployment of the IP module during servicing. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs continuous diagnostic tests on the deployment loop to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, the SDM will store a diagnostic trouble code (DTC).
Ignition 1 voltage is within the normal operating voltage range.
The DTC will set if one of the following conditions occurs:
• | IP module stage 1 high circuit is less than 2.4 volts and the IP module deployment loop is more than 6 ohms for 500 milliseconds during the deployment loop voltage out of range test. |
• | IP module deployment loop resistance is more than 4.8 ohms for 500 milliseconds during the deployment loop resistance measurement test. |
The SDM commands the AIR BAG indicator ON via Class 2 serial data.
• | 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. |
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
• | The wire to terminal connections in the IP module stage 1 high circuit |
• | The wire to terminal connections in the IP module stage 1 low circuit |
• | The IP module connector |
• | A malfunctioning IP module |
• | The SDM connector |
• | An internal SDM malfunction |
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
The number(s) below refer to the step number(s) on the diagnostic table.
Tests to see if the malfunction is intermittent
Tests to see if the malfunction is caused by the IP module
Tests to see if there is an open or a high resistance in the IP module stage 1 high or IP module stage 1 low circuits
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: SIR Schematics | |||
1 | Did you perform the Diagnostic System Check - SIR? | Go to Step 2 | |
2 |
Does the IP module 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 10 | -- |
Does the scan tool indicate that DTC B0017 is current? | Go to Step 5 | Go to Diagnostic Aids | |
Important: When installing the J 38715-A SIR Driver/Passenger Load Tool for testing the dual stage IP module, the correct 4-way load tool adapter must be used. Failure to use the correct 4-way load tool adaptor will set additional codes during testing. Does the scan tool indicate that DTC B0017 is current? | Go to Step 7 | Go to Step 6 | |
6 |
Did you complete the replacement? | Go to Step 10 | -- |
7 |
Did you find and correct the problem? | Go to Step 10 | Go to Step 8 |
Test the IP module stage 1 high and IP module stage 1 low circuits for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 | |
9 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |