2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2602
Circuit/System Description
The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied
directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control
circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side
driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by
the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the ECM, and to several additional circuits.
Conditions for Running the DTC
P0685
* The ignition is ON.
* The run/crank voltage is between 11-32 V.
P0690
* This DTC will run with the ignition ON or OFF.
* This DTC will run when the powertrain relay is commanded ON or OFF.
* DTC P0685 is not set.
Conditions for Setting the DTC
P0685
The commanded state of the ODM and the actual state of the control circuit do not match.
P0690
* The ECM detects more than 18 V on the ignition 1 voltage circuit to the ECM when the relay is commanded ON.
* The ECM detects more than 2 V on the ignition 1 voltage circuit to the ECM when the relay is commanded OFF.
* The condition is present for more than 2 s.
Action Taken When the DTC Sets
DTCs P0685 and P0690 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0685 and P0690 are Type B DTCs.
Diagnostic Aids
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
Reference Information
Schematic Reference
* Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
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
