K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
Steps 33-40
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. The
following modules communicate on the class 2 serial data circuit:
^
Body Control Module (BCM)
^
Powertrain Control Module (PCM)
^
Automatic Transfer Case (ATC)
^
Electronic Brake Control Module (EBCM)
^
Inflatable Restraint Sensing and Diagnostic Module (SDM)
^
Instrument Panel Cluster (IPC)
^
Suspension Control Module (SCM)
^
HVAC Control Module
^
Automatic Transmission
^
Driver Information Center (DIC)
^
Memory Mirror Control Module
^
Memory Seat Control Module
^
OnStar(R)/Cellular Phone line
3. The following DTCs may be retrieved with a history status:
^
U1300
^
U1301
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 U1000 or U1255 having a current status. This indicates that the
malfunction occurred when the ignition was ON.
5. Data link connector terminals 2 and 5 provide the connection to the class 2 serial data circuit and the signal ground circuit respectively.
7. A poor connection at terminal A would cause this condition but will not set a DTC.
