Circuit Description
When you turn the ignition switch to the ON position, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests in order to diagnose critical malfunctions. Next, the SDM measures IGNITION 1 voltage in order to verify the normal ranges. The SDM proceeds with the Deployment Loop Continuity test. During the Deployment Loop Continuity test, the SDM measures the voltage difference between Driver Side High and the Driver Side Low.
Conditions for Setting the DTC
| • | The voltage difference at the driver high side terminal 9 and at the driver low side terminal 10 is 400 mV or more. |
| • | The malfunction must be present for at least 500 milliseconds during one of the following tests: |
| - | If the malfunction is detected in the Deployment Loop Continuity test, the Resistance Measurement test will not be performed. |
| - | The Continuous Monitoring test. |
Action Taken When the DTC Sets
| • | The SDM sets a diagnostic trouble code. |
| • | The SDM turns ON the AIR BAG warning lamp. |
Conditions for Clearing the DTC
| • | Clear the current DTC if the voltage difference between the driver high side terminal 9 and the driver low side terminal 10 is less than 400 mV for 500 milliseconds. |
| • | Clear the HISTORY DTC under the following conditions: |
| - | Use a scan tool in order to clear the DTC. |
| - | 250 malfunction-free ignition cycles have occurred. |
Diagnostic Aids
The following conditions can cause an intermittent:
| • | A poor connection at terminal 1 and at terminal 2 of the steering column connector of the inflatable restraint steering wheel module. |
| • | A poor connection at terminal 1 and at terminal 2 of the upper connector of the inflatable restraint steering wheel module coil. |
If this table requests measurements, use the J 39200 Digital Multimeter with the correct terminal adapter from the J 35616 Connector Test Adapter Kit. If a check for a correct connection is requested, refer to Testing for Intermittent Conditions and Poor Connections . If a wire repair, a connector repair, or a terminal repair is requested, use the J-38125 Terminal Repair Kit, and refer to Wiring Repair .
DTC Table Test Description
The numbers below refer to step numbers on the diagnostic table.
-
This step determines the deployment loop voltage difference that the Sensing and Diagnostic Module (SDM) measures.
-
This step checks for correct contact or for corrosion of the yellow 2-way connector.
-
This step isolates the malfunction to one side of the yellow 2-way connector on the inflatable restraint steering wheel module. This connector is located near the base of the steering column.
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This step determines whether the malfunction is in the inflatable restraint steering wheel module coil or in the inflatable restraint steering wheel module.
-
This step checks for correct contact or for corrosion of the SDM connector.
-
This step checks for correct contact or for corrosion of the SDM connector.
-
This test determines if the malfunction is in the GRN/RED wire.
-
This test determines if the malfunction is in the GRN wire.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Have you read the DRIVER VDIF and recorded the value on the repair order? | -- | -- | ||
Are the terminals damaged or corroded? | -- | |||
4 | Replace the yellow 2-way harness connector at the base of the steering column. Refer to SIR Connector (Plastic Body and Terminal Metal Pin) Repair portion of Wiring Repair . Have you replaced the yellow 2-way harness connector? | -- | -- | |
5 | Check for a correct connection at the terminal D3 and at terminal D4 on the coil side of the 2-way connector of the inflatable restraint steering wheel module. Are the terminals damaged or corroded? | -- | ||
6 | Check for a correct connection at the terminal D3 and at terminal D4 on the coil side of the 2-way connector of the inflatable restraint steering wheel module. Are the terminals damaged or corroded? | -- | ||
7 | Replace the inflatable restraint steering wheel module coil. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement . Have you replaced the inflatable restraint steering wheel module coil? | -- | -- | |
8 |
Is the DRIVER VDIF more than the specified value? | 400 mV | ||
9 |
Have you replaced the yellow 2-way harness connector? | -- | ||
Is the DRIVER VDIF more than the specified value? | 400 mV | |||
Is the DRIVER VDIF more than the specified value? | 400 mV | |||
Have you replaced the inflatable restraint steering wheel module? | -- | -- | ||
13 |
Have you replaced the inflatable restraint steering wheel module Coil? | -- | -- | |
Is the SDM harness connector damaged or corroded? | -- | |||
15 | Replace the SDM harness connector. Refer to SIR Connector (Plastic Body and Terminal Metal Pin) Repair portion of Wiring Repair . Have you replaced the SDM harness connector? | -- | -- | |
16 | Check for a correct connection at terminal 9 and 10 on the SDM. Are the SDM terminals damaged or corroded? | -- | ||
17 | Check for a correct connection at terminal 9 and at terminal 10 on the SDM. Are the SDM terminals damaged or corroded? | -- | ||
18 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Have you replaced the SDM? | -- | -- | |
Is the resistance reading within the specified values? | 0-0.5 ohms | |||
20 | Repair the high resistance in the GRN/RED wire. Have you repaired the circuit? | -- | -- | |
Is the resistance reading within the specified values? | 0-0.5 ohms | |||
22 | Repair the high resistance in the GRN wire. Have you repaired the circuit? | -- | -- | |
23 | Reconnect and mount all of the SIR system components. Have you reconnected and correctly mounted all the SIR components? | -- | -- | |
24 | Clear the SIR diagnostic trouble codes. Have you cleared the SIR Diagnostic trouble codes? | -- | -- |
