Scan Tool Does Not Communicate With Class 2 Device

Data Tool Does Not Communicate With Class 2 Device (Part 1 Of 4):

Data Tool Does Not Communicate With Class2 Device (Part 2 Of 4):

Scan Tool Does Not Communicate With Class 2 Device (Part 3 Of 4):

Scan Tool Does Not Communicate With Class 2 Device (Part 4 Of 4):

CIRCUIT DESCRIPTION
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. Connecting a scan tool to the DLC allows communication with the modules for diagnostic purposes.

DIAGNOSTIC AIDS
The engine will not start when there is a total malfunction of the class 2 serial data circuit while the engine is not running.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. A partial malfunction in the class 2 serial data circuit uses a different procedure from a total malfunction of the class 2 serial data circuit.
3. The DTC U1300 and U1301 may be retrieved with a history status. These DTCs are not the cause of the present condition.
4. A State of Health DTC with a history status may be present along with a U1OOO with a current status. This indicates that the malfunction occurred when the ignition was on.
6. Data link connector terminals 2 and 5 provide the connection to the class 2 serial data circuit and the signal ground circuit respectively.
8. An open in the class 2 serial data circuit between the DLC and the body control module (BCM) will prevent the scan tool from communicating with any module. This condition will not set a DTC.
9. If communication can be established, the malfunction is not in the BCM or the wiring from the DLC to the BCM.
10. If communication can be established, the malfunction is in the instrument cluster, the radio, the SDM or the wiring between these devices
12. If communication can be established, the malfunction is in the SDM, EBCM or the wiring between these devices.