2010 Cadillac Truck SRX FWD V6-3.0L Page 2179

2010 Cadillac Truck SRX FWD V6-3.0L Page 2179

Bus/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool References

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

1. Verify the appropriate DTC is not set.

瀚慖f the DTC is set along with other codes, diagnose all other codes first. If no other codes are set, program the control module specified by

the DTC descriptor.

2. With a scan tool, clear the DTCs.

3. Ignition OFF, remove the scan tool, open and close the drivers door.

4. Wait 60 seconds, then verify the DTC is not set.

瀚慖f the DTC is set, replace the appropriate control module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning)for control module replacement, setup, and programming

U2103

DTC U2103

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC U2103 00

- Fewer Controllers On Than Programmed

Circuit Description

Modules connected to the GMLAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating

information and commands are exchanged among the modules. The modules have programmed information about what messages are needed to be

exchanged on the serial data circuits, for each virtual network. The messages are also supervised and some periodic messages are used by the

receiver module as an availability indication of the transmitter module.

DTC U2103 will set when fewer modules are detected on the buss before the modules can learn the other module IDs. If the communication buss is

opened, or if the module power supply is lost when the vehicle is in the OFF power mode, and then placed in the RUN power mode, U2103 will set

in specific modules.

Conditions for Running the DTCs

* Voltage supplied to the modules is in the normal operating voltage range.

* The vehicle power mode requires serial data communication to occur.

* The DTC U2100 does not have a current status.