Scan Tool Does Not Communicate With SDM

Scan Tool Does Not Communicate with SDM (Part 1 Of 2):

Scan Tool Does Not Communicate with SDM (Part 2 Of 2):

CIRCUIT DESCRIPTION
The Data Link Connector (DLC) provides communication with the inflatable restraint Sensing and Diagnostic Module (SDM). The DLC is under the instrument panel. The DLC supplies battery voltage and ground to the scan tool. The scan tool communicates with the SDM on the serial data line. The scan tool is connected to the DLC in order to perform the following functions:
^ Read the data list.
^ Read the diagnostic trouble codes (DTCs).
^ Clear the DTCs.

When measurements are requested in this table, use J39200 Digital Multimeter with the correct terminal adapter from J 35616-A Connector Test Adapter Kit. When a wire, connector or terminal repair is requested, use J38 125-B Terminal Repair Kit and refer to Wiring Repair.

TEST DESCRIPTION
3. This test checks for an open or for a high resistance condition in the SDM ground circuit.
4. This test checks for an open or for a high resistance condition in the SDM voltage feed circuit.
5. This test checks for an open or for a high resistance condition in the serial data circuit.
6. This test checks for a short to ground condition in the serial data circuit.
7. This test checks for a short to voltage condition in the serial data circuit.
8. This test checks for a short to ground condition in the SDM voltage feed circuit.