2010 Cadillac CTS Sedan AWD V6-3.0L Page 1522

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2010 Cadillac CTS Sedan AWD V6-3.0L Page 1522



Circuit/System Description



When the ignition switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the



ignition is in the START position. The BCM then sends a message to the engine control module (ECM) that crank has been requested. The ECM



then verifies that the clutch pedal is depressed or the transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit of the



starter relay. When this occurs, battery voltage is supplied through the switch of the starter relay to the starter solenoid.



Conditions for Running the DTC



* The ignition is in the START position.



* The system voltage is between 9.5-18 V.



Conditions for Setting the DTC



The ECM detects improper voltage on the control circuit of the starter relay.



Action Taken When the DTC Sets



DTC P0615, P0616, and P0617 are C type DTCs.



Conditions for Clearing the DTC



DTC P0615, P0616, and P0617 are C type DTCs.



Reference Information



Schematic Reference



Starting and Charging Schematics (See: Starting and Charging/Diagrams/Electrical Diagrams)



Connector End View Reference



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



Description and Operation



Starting System Description and Operation (See: Starting and Charging/Starting System/Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)



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



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



Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)



DTC Type Reference



Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code



(DTC) Type Definitions)



Scan Tool Reference



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



Circuit/System Testing



1. Ignition OFF, disconnect the KR27 starter relay.



2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5.0 Ohms between the relay



ground circuit terminal 85 and ground.



瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.



3. Ignition OFF, connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.



4. With the transmission range selector in park or neutral, cycle the ignition between the OFF and CRANK position. The test lamp should turn



ON and OFF when changing between the commanded states.

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