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 voltage is within the normal operating voltage range. |
| • | Passenger frontal deployment loop is not shorted to voltage. |
| • | Passenger frontal high terminal A3 is less than 2 volts. |
Deployment loop resistance measurement test:
| • | Ignition 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 deployment loop resistance is at least 6 ohms for 300 milliseconds.
Deployment loop resistance measurement test - Passenger frontal 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
| • | 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 can cause an intermittent condition:
| • | The inflatable restraint IP module 2-way harness connector terminal A and terminal B. |
| • | The SDM wiring harness connector terminal A3 and terminal A8. |
| • | 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.
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This step checks the inflatable restraint IP module yellow 2-way connector at the base of the steering column.
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This step isolates the malfunction to one side of the inflatable restraint IP module yellow 2-way connector at the base of the steering column.
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This step checks the inflatable restraint IP module yellow 2-way connector at the inflatable restraint IP module.
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This step determines if there is an open or high resistance in either the passenger frontal high or the passenger frontal low circuits between the inflatable restraint IP module yellow 2-way connector at the inflatable restraint IP module and the inflatable restraint IP module yellow 2-way connector at the base of the steering column or if there is a malfunctioning inflatable restraint IP module.
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This step checks to see if the SDM wiring harness connector is OK.
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This step checks to see if there is an open or a high resistance in the passenger frontal high circuit between the inflatable restraint IP module yellow 2-way connector at the base of the steering column and the SDM wiring harness connector.
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This step determines if there is an open or high resistance in the passenger frontal low circuit between the inflatable restraint IP module yellow 2-way connector at the base of the steering column and the SDM wiring harness connector or if there is a malfunctioning SDM.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the SIR Diagnostic System Check? | -- | Go to Step 2 | |||||||
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Does either the component or harness side of the inflatable restraint IP module yellow 2-way connector exhibit any signs of corrosion, terminal damage, or poor connections? | -- | Go to Step 3 | Go to Step 4 | |||||||
3 | If either side of the inflatable restraint IP module yellow 2-way connector at the base of the steering column is damaged, replace the connector. Refer to Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 14 | -- | ||||||
4 |
Does the scan tool indicate that this DTC is current? | -- | Go to Step 5 | Go to Diagnostic Aids | ||||||
5 |
Does the scan tool indicate that this DTC is current? | -- | Go to Step 11 | Go to Step 6 | ||||||
Does either the component or harness side of the inflatable restraint IP module yellow 2-way connector at the IP module exhibit any signs of corrosion, terminal damage, or poor connections? | -- | Go to Step 7 | Go to Step 8 | |||||||
7 |
Did you complete the repair? | -- | Go to Step 18 | -- | ||||||
Does the scan tool indicate that this DTC is current? | -- | Go to Step 9 | Go to Step 10 | |||||||
9 |
Did you complete the repair? | -- | Go to Step 18 | -- | ||||||
10 |
Did you complete the replacement? | -- | Go to Step 18 | -- | ||||||
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Does the SDM wiring harness connector exhibit any signs of corrosion, terminal damage, or poor connections? | -- | Go to Step 12 | Go to Step 13 | |||||||
12 | Replace the SDM wiring harness connector. Refer to Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 18 | -- | ||||||
Does the resistance measure less than the specified value? | 0.5 ohms | Go to Step 15 | Go to Step 14 | |||||||
14 | Locate and repair the open or high resistance in the passenger frontal high circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 18 | -- | ||||||
Use the DMM to measure the resistance of the passenger frontal low circuit. Does the resistance measure less than the specified value? | 0.5 ohms | Go to Step 17 | Go to Step 16 | |||||||
16 | Locate and repair the open or high resistance in the passenger frontal low circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 18 | -- | ||||||
17 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | -- | Go to Step 18 | -- | ||||||
18 |
Did you complete the action? | -- | -- |
