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. |
| • | Passenger frontal deployment loop is not shorted to voltage. |
| • | Passenger frontal high terminal is less than 2.4 volts. |
Deployment loop resistance measurement test:
| • | Ignition 1 voltage is within the normal operating voltage range. |
| • | Passenger frontal deployment loop is not shorted to voltage. |
| • | Passenger frontal deployment loop is not shorted to ground. |
Conditions for Setting the DTC
Deployment loop voltage out of range test - passenger frontal high is less than 2.4 volts, passenger frontal loop resistance is greater than or equal to 6 ohms for 500 milliseconds.
Deployment loop resistance measurement test - passenger frontal deployment loop resistance is more than 4.8 ohms for 500 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
| • | The passenger frontal deployment loop resistance is 4.8 ohms or less for 500 milliseconds. |
| • | You can issue a CLEAR CODES command. |
| • | A history DTC will clear once 255 malfunction free ignition cycles have occurred. |
Diagnostic Aids
The following may cause an intermittent condition:
| • | The inflatable restraint IP module 2-way harness connector |
| • | The SDM wiring harness connector |
| • | The wire to terminal connections in the passenger frontal high circuit |
| • | The wire to terminal connections in the passenger frontal 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.
-
This step checks the IP/passenger inflator module in-line connector.
-
This step checks to see if there is a malfunctioning inflatable restraint passenger frontal module.
-
This step checks to see if the inflatable restraint sensing and diagnostic module (SDM) wiring harness connector is OK.
-
This step checks to see if there is an open or high resistance in the passenger frontal high deployment circuit.
-
This step determines if there is an open or high resistance in the passenger frontal low deployment circuit or if there is a malfunctioning SDM.
Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | |||||||||
Does connector exhibits any signs of corrosion, terminal damaged, or poor connections? | -- | Go to Step 3 | Go to Step 4 | |||||||||
3 | Replace the wiring harness side of in-line connector. Refer to Connector Repairs in Wiring Systems. Did you complete the replacement? | -- | Go to Step 14 | -- | ||||||||
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 14 | -- | ||||||||
Is the SDM wiring harness connector OK? | -- | Go to Step 9 | Go to Step 8 | |||||||||
8 | Repair or replace the SDM wiring harness connector. Refer to Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 14 | -- | ||||||||
Use J 39200 DMM and measure the resistance of passenger frontal high circuit between in-line connector terminal and the SDM wiring harness connector. Does the resistance measure greater than the specified value? | 0-0.5 ohms | Go to Step 10 | Go to Step 11 | |||||||||
10 | Locate and repair the open or a high resistance in passenger frontal high deployment circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 14 | -- | ||||||||
Use J 39200 and measure the resistance of passenger frontal low circuit between in-line connector terminal and the SDM wiring harness connector. Does the resistance measure greater than the specified value? | 0-0.5 ohms | Go to Step 12 | Go to Step 13 | |||||||||
12 | Locate and repair the open or a high resistance in passenger frontal low deployment circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 14 | -- | ||||||||
13 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- | ||||||||
14 |
Did you complete the action? | -- | -- |
