Data Link Communication System: Other Hummer H2 I

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 in 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 Conditions and Poor Connections in Wiring Systems.

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. Common signal ground at terminal 5.
4. Class 2 signal at terminal 2.

Class 2 Serial Data Line

The class 2 serial data communications circuit on this vehicle is in a star configuration. This configuration has 3 splice packs, located as follows

1. The splice pack - SP205 located near the data link connector
2. The splice pack - SP206 located under the steering column
3. The splice pack - SP207 located under the LH cowl panel

There is also a direct redundant class 2 serial data circuit between BCM and PCM.

The following modules communicate on the class 2 serial data circuit

1. Splice pack - SP205 attaches to: BCM DDM EBCM ESC FPDM HVAC control module IPC PCM Radio TCSCM
2. Splice pack - SP206 attaches to: Audio amplifier (early production), refer to «Radio/Audio System Description and Operation»(ref-187213-S02333852502005083100000) in Entertainment for more information. RSA control VCIM
3. Splice pack - SP207 attaches to DSM and SDM.