2010 Cadillac Truck SRX FWD V6-3.0L Page 2162

2010 Cadillac Truck SRX FWD V6-3.0L Page 2162

normal vehicle operation. Operating information and commands are exchanged among the control modules when the ignition switch is in any

position other than OFF. The mid speed or chassis high speed GMLAN serial data bus uses a terminating resistor that is in parallel with the mid

speed or chassis high speed GMLAN (+) and (-) circuits.

Conditions for Running the DTC

The system voltage is between 9-16 V.

Conditions for Setting the DTC

A supervised periodic message that includes the transmitter module availability has not been received.

Action Taken When the DTC Sets

Specific subsystems will not function.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

* Use the Data Link References (See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and

Inspection/Initial Inspection and Diagnostic Overview) to identify the mid speed or chassis high speed GMLAN serial data modules.

* Some control modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition

voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no control module output voltage circuit is

shorted to ground before replacing the control module.

* An open in the DLC ground circuit terminal 5 will allow the scan tool to operate to set up the vehicle on the tool and then not communicate

with the vehicle. When the scan tool is to the point of communicating with the vehicle, a message on the scan tool will indicate "no CANdi

module detected" and will not communicate.

Reference Information

Schematic Reference

Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information

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 Reference

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

Circuit/System Verification

1. Verify there are no other U code DTCs set.

瀚慖f other U code DTCs are set, diagnose them first. Refer to Control Module U Code List (See: Diagnostic Trouble Code

Descriptions/Control Module U Code List).

2. Refer to Data Link References (See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and

Inspection/Initial Inspection and Diagnostic Overview) to determine if the control module setting DTC U0074 is on the mid speed or chassis

high speed serial data circuits.

Circuit/System Testing