The scan tool used provides the following capabilities:
| • | Read the data list |
| • | Read current and history Diagnostic Trouble Codes (DTC) |
| • | Clear the DTCs after a repair is completed |
Make sure the scan tool contains updated software before attempting to communicate with the SIR system. To use the scan tool, connect it to the Data Link Connector (DLC) and turn the ignition switch to the RUN position. The scan tool reads serial data sent from the inflatable restraint Sensing and Diagnostic Module (SDM) serial data output terminal 5 and 17 to the DLC terminal 2. The following table shows the typical values of the data displays under the following conditions:
| • | Ignition switch in RUN |
| • | Engine OFF |
| • | Driver seatbelt buckled |
Data List | Description | Typical Value |
|---|---|---|
Ignition 1 | Ignition Positive Voltage power feed | 12 V |
Driver Senselo | Driver frontal low terminal voltage | 3-4 V |
Passenger Senselo | Passenger frontal low terminal voltage | 3-4 V |
Driver VDIF | Voltage difference between driver frontal high and driver frontal low terminals | 4-8 mV |
Passenger VDIF | Voltage difference between passenger frontal high and passenger frontal low terminals | 4-8 mV |
Driver Energy Reserve | Steering wheel module loop reserve voltage | 22-24 V |
Pass. Energy Reserve | IP module loop reserve voltage | 22-24 V |
Sensor Feed | Discriminating sensor voltage | 2 - 3 V |
Warning Lamp ON | Continuous warning lamp ON time | 0 - 182 Hrs |
Ignition Cycles Lamp ON | Number of ignition cycles with warning lamp ON | 0 - 125 Cycles |
Ignition Cycles Lamp OFF | Number of ignition cycles with the warning lamp OFF | 0 - 125 Cycles |
Driver Seatbelt | Driver seatbelt status (Buckled/Unbuckled) | Buckled |
