Circuit Description
The Data Link Connector (DLC) is the provision for communicating with the inflatable restraint Sensing and Diagnostic Module (SDM). The DLC is located under the instrument panel. The DLC supplies battery power and ground to the scan tool. The scan tool communicates with the SDM over the serial data circuit (CKT 800). The scan tool is connected to the DLC in order to perform the following functions:
| • | Reading the data list |
| • | Reading Diagnostic Trouble Codes (DTCs) |
| • | Clearing DTCs |
When measurements are requested in this table, use J 39200 Digital Multimeter with the correct terminal adapter from J 35616 Connector Test Adapter Kit. When a check for proper connection is requested, refer to General Electrical Diagnosis Procedures in Wiring Systems. When a wire, connector or terminal repair is requested, use J-38125 Terminal Repair Kit and refer to Wiring Repair .
Test Description
-
This test checks for proper operation of the scan tool.
-
This test checks for proper connection at the Data Link Connector (DLC).
-
This test checks for proper connection at the inflatable restraint Sensing and Diagnostic Module (SDM) harness connector.
-
This test checks for an open condition in CKT 800.
-
This test checks for a short-to-ground condition in CKT 800.
-
This test checks for a short-to-B+ condition in CKT 800.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Does the scan tool power-up? | -- | Go to Scan Tool Inoperative in Wiring Systems | ||
3 | Attempt to establish communication with the same system on a different vehicle. Can communication be established? | -- | ||
Is the DLC damaged or corroded? | -- | |||
5 | Repair the Data Link Connector (DLC). Refer to Connector Repairs in Wiring Systems. Are the repairs complete? | -- | -- | |
Is the connector damaged or corroded? | -- | |||
7 | Replace the SDM harness connector. Refer to Wiring Repair . Are the repairs complete? | -- | -- | |
8 | Check for proper connection at terminal 5 of the SDM. Is the terminal damaged or corroded? | -- | ||
9 | Check for proper connection at terminal 5 of the SDM. Is the terminal damaged or corroded? | -- | ||
10 | Replace the inflatable restraint Sensing and Diagnostic Module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module . Are the repairs complete? | -- | -- | |
Measure the resistance from the SDM harness connector terminal 5 to the DLC terminal 9. Is the resistance reading within the specified values? | 0-5 ohms | |||
12 | Repair an open condition in CKT 800. Are the repairs complete? | -- | -- | |
Measure the resistance from the DLC terminal 9 to ground. Is the resistance reading less than the specified value? | OL | |||
14 | Repair a short-to-ground condition in CKT 800. Are the repairs complete? | -- | -- | |
Is the measured voltage less than the specified value? | 1.0 V | Go to Integrity Check | ||
16 |
Are the repairs complete? | -- | -- | |
17 | Scan tool may be malfunctioning. Refer to scan tool instruction manual. Has proper scan tool operation been verified? | -- | -- | |
18 | Reconnect all the SIR system components, make sure all the components are properly mounted. Have all the SIR components been reconnected and properly mounted? | -- | -- |
