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 side deployment loop is not shorted to voltage. |
| • | Driver side high terminal B1 of connector C2 is less than 2 volts. |
Deployment loop resistance measurement test:
| • | Ignition 1 voltage is within the normal operating voltage range. |
| • | Driver side deployment loop is not shorted to voltage. |
| • | Driver side deployment loop is not shorted to ground. |
Conditions for Setting the DTC
Deployment loop voltage out of range test - Driver side deployment loop resistance is at least 6 ohms for 300 milliseconds.
Deployment loop resistance measurement test - Driver side deployment loop resistance is more than 3.7 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 side impact module - LH yellow 2-way connector. |
| • | The SDM wiring harness connector C2. |
| • | The wire to terminal connections in the driver side high circuit. |
| • | The wire to terminal connections in the driver side 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.
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This step checks the inflatable restraint side impact module - LH yellow 2-way connector.
-
This step checks to see if there is a malfunctioning inflatable restraint side impact module - LH.
-
This step checks to see if there is an open or a high resistance in the driver side high circuit.
-
This step determines if there is an open or a high resistance in the driver side low circuit or if there is a malfunctioning SDM.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform A Diagnostic System Check - SIR? | -- | Go to Step 2 | |||||||
Does either the component or harness side of the inflatable restraint side impact module - LH yellow 2-way connector exhibit any signs of corrosion, terminal damage, or poor connections? | -- | Go to Step 3 | Go to Step 4 | |||||||
3 |
Did you complete the repair? | -- | Go to Step 12 | -- | ||||||
4 |
Does the scan tool indicate that this DTC is current? | -- | Go to Step 5 | Go to Diagnostic Aids | ||||||
Does the scan tool indicate that this DTC is current? | -- | Go to Step 7 | Go to Step 6 | |||||||
6 |
Did you complete the replacement? | -- | Go to Step 12 | -- | ||||||
Does the resistance measure less than the specified value? | 0.5 ohms | Go to Step 9 | Go to Step 8 | |||||||
8 | Locate and repair the open or the high resistance in the driver side high circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 12 | -- | ||||||
Use the DMM to measure the resistance of the driver side low circuit. Does the resistance measure less than the specified value? | 0.5 ohms | Go to Step 11 | Go to Step 10 | |||||||
10 | Locate and repair the open or the high resistance in the driver side low circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 12 | -- | ||||||
11 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement or Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- | ||||||
12 |
Did you complete the action? | -- | Go to Inflatable Restraint Sensing and Diagnostic Module Replacement | -- |
