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.
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 A3 is less than 2 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. |
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.
The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.
• | You can issue a CLEAR CODES command |
• | A history DTC will clear once 255 malfunction free ignition cycles have occurred |
The following can cause an intermittent condition:
• | The inflatable restraint IP module 2-way harness connector terminal A and terminal B. |
• | The SDM 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. |
The number(s) below refer to the step number(s) on the diagnostic table.
This step checks the inline connector C216.
This step isolates the malfunction to one side of inline connector C216.
This step checks to see if the SDM wiring harness connector is OK.
This step checks to see if there is an open or a high resistance in the passenger frontal high circuit between inline connector C216 and the SDM wiring harness connector.
This step determines if there is an open or high resistance in the passenger frontal low circuit between inline connector C216 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 | |||||||
Does either the male or female side of inline connector C216 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 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 | -- | ||||||
Does the SDM wiring harness connector exhibit any signs of corrosion, terminal damage, or poor connections? | -- | Go to Step 8 | Go to Step 9 | |||||||
8 | Replace the SDM wiring harness connector. Refer to Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 14 | -- | ||||||
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 high resistance in the passenger frontal high circuit between the inline connector C216 and the SDM wiring harness connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 14 | -- | ||||||
Use the DMM to measure the resistance of the passenger frontal low circuit between the inline connector C216 and the SDM wiring harness connector. Does the resistance measure less than the specified value? | 0.5 ohms | Go to Step 13 | Go to Step 12 | |||||||
12 | Locate and repair the open or high resistance in the passenger frontal low circuit between the inline connector C216 and the SDM wiring harness connector. 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? | -- | -- |