Circuit Description
When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within the SDM itself.
Upon passing this test, ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deployment loops.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC 025 SIR Warning Lamp
Conditions for Running the DTC
Ignition voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The warning lamp does not properly blink ON and OFF.
Action Taken When the DTC Sets
The SDM commands the AIR BAG indicator ON.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Diagnostic Aids
When the ignition switch is turned ON, normally, the warning lamp blinks 7 times during 7 seconds.
If the warning lamp stays ON or blinks a second after the normal blinking, 7 times during 7 seconds, it is regarded as a defect, old or current. Inspect the defect with a scan tool.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
|
Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section. Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section. Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | ||||
1 | Did you perform a Diagnostic System Check - SIR? | -- | Go to Step 2 | |
2 | Inspect the fuse F4. Is the fuse F4 open? | Go to Step 3 | Go to Step 4 | |
3 | Replace the fuse F4. Did you complete the replacement? | Go to Step 15 | -- | |
4 |
Does the voltage measure within the specified range? | 11-14 V | Go to Step 6 | Go to Step 5 |
5 | Repair the open power supply circuit for the fuse F4. Did you complete the repair? | Go to Step 15 | -- | |
6 |
Is the bulb OK? | Go to Step 8 | Go to Step 7 | |
7 | Replace the warning lamp bulb. Did you complete the replacement? | Go to Step 15 | -- | |
8 |
Is the voltage as specified? | 11-14 V | Go to Step 10 | Go to Step 9 |
9 | Repair the wire between fuse F4 and terminal 11 of cluster connector or terminal 17 of clock connector. Did you complete the repair? | -- | Go to Step 15 | -- |
10 | Verify the connection of terminals 11 and 23 of the cluster connector or terminals 17 and 7 of clock connector. Is the connection OK? | -- | Go to Step 12 | Go to Step 11 |
11 | Replace the instrument cluster or clock. Did you complete the replacement? | Go to Step 15 | -- | |
12 |
Is the voltage as specified? | 11-14 V | Go to Step 13 | 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 15 | -- |
14 | Repair the wire between terminal 7 of the SDM and the cluster or clock. Did you complete the repair? | -- | Go to Step 15 | -- |
15 |
Does the DTC reset? | Go to Step 2 | System OK | |
