Data Link Communication System: Other Chevrolet Silverado 2500

Conditions for Setting the DTCs

1. No valid messages are detected on the class 2 serial data circuit.
2. The voltage level detected on the class 2 serial data circuit is under one of the following conditions: High Low
3. The above conditions are met for approximately 3 seconds.

Action Taken When the DTCs Sets

The module uses default values for all parameters received on the class 2 serial data circuit.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT & POOR CONNECTIONS .

Data Link Connector (DLC)

The data link connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following

1. Scan tool power battery positive voltage at terminal 16.
2. Scan tool power ground at terminal 4.
3. Class 2 serial data at terminal 2.
4. Common signal ground at terminal 5.

Class 2 Serial Data Line

The class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line

1. The body control module (BCM)
2. The driver information center (DIC)
3. The electronic brake control module (EBCM)
4. The HVAC control module
5. The inflatable restraint sensing and diagnostic module (SDM)
6. The instrument panel cluster (IPC)
7. The memory seat module (MSM) w/A45
8. The powertrain control module (PCM)
9. The rear wheel steering control module w/NYS
10. The transfer case shift control module w/4WD
11. The transmission control module (TCM) w/Allison transmission
12. The vehicle interface unit (VIU) w/UX2