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.
Deployment loop resistance measurement test:
• | Ignition 1 voltage is within the normal operating voltage range. |
• | Passenger frontal deployment loop is not shorted to voltage. |
Deployment loop voltage out of range test - Passenger frontal high terminal A3 is more than 6 volts for 300 milliseconds.
Deployment loop resistance measurement test - Passenger frontal high terminal A3 is less than 2 volts AND passenger frontal deployment loop resistance is less than 6 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 |
A short to B+ or a short to ground condition in the inflatable restraint IP module deployment loop can cause an intermittent condition. Inspect the passenger frontal high and passenger frontal low circuits carefully for cutting or chafing. Wiring pigtail damage requires replacement of the inflatable restraint IP module.
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 C216.
This step checks to see if there is a short to ground in the passenger frontal high circuit.
This step checks to see if there is a short to ground in the passenger frontal low circuit.
This step checks to see if there is a short to B+ in the passenger frontal high circuit.
This step determines if there is a short to B+ in the passenger frontal low circuit or if there is a malfunctioning SDM.
This step clears all SIR and all communication DTCs.
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 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 16 | -- | ||||||
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 16 | -- | ||||||
Does the resistance measure less than the specified value? | OL | Go to Step 8 | Go to Step 9 | |||||||
8 | Locate and repair the short to ground in the passenger frontal high circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- | ||||||
Use the DMM the measure the resistance between the passenger frontal low circuit and a known good ground. Does the resistance measure less than the specified value? | OL | Go to Step 10 | Go to Step 11 | |||||||
10 | Locate and repair the short to ground in the passenger frontal low circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- | ||||||
Does the voltage measure less than the specified value? | 1 V | Go to Step 13 | Go to Step 12 | |||||||
12 | Locate and repair the short to B+ in the passenger frontal high circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- | ||||||
Use the DMM to measure the voltage between the passenger frontal low circuit and a known good ground. Does the voltage measure less than the specified value? | 1 V | Go to Step 15 | Go to Step 14 | |||||||
14 | Locate and repair the short to B+ in the passenger frontal low circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- | ||||||
15 |
Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
Did you complete the action? | -- | -- |