2010 Cadillac CTS Sedan AWD V6-3.6L Page 1454
* The ECM driver transitions from ON to OFF or from OFF to ON.
* DTC P0480, P0481, P0691, P0692, P0693, and P0694 run continuously when the conditions above are met for greater 5 mS.
Conditions for Setting the DTC
P0480
The ECM detects an open in the cooling fan relay 1 control circuit.
P0481
The ECM detects an open in the cooling fan relay 2 control circuit.
P0691
The ECM detects a short to ground in the cooling fan relay 1 control circuit.
P0692
The ECM detects a short to voltage in the cooling fan relay 1 control circuit.
P0693
The ECM detects a short to ground in the cooling fan relay 2 and 3 control circuit.
P0694
The ECM detects a short to voltage in the cooling fan relay 2 and 3 control circuit.
Action Taken When the DTC Sets
DTCs P0480, P0481, P0691, P0692, P0693, and P0694 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0480, P0481, P0691, P0692, P0693, and P0694 are Type B DTCs.
Diagnostic Aids
* The scan tool cooling fan output control operates as follows:
- Cooling Fan Relay 1 operates the fan at a low speed
- Cooling Fan Relay 2 and 3 operates the fan at a medium speed
- Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
* KR20 cooling fan relay identification:
- KR20C cooling fan low speed FAN 1 Relay
- KR20D cooling fan high speed FAN 2 Relay
- KR20E cooling fan speed control FAN 3 or S/P Relay
* When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the
correct orientation in the fuse block. Test the mating electrical terminals for tightness.
Reference Information
Schematic Reference
Engine Cooling Schematics (See: Engine, Cooling and Exhaust/Cooling System/Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Cooling Fan Description and Operation (See: Engine, Cooling and Exhaust/Cooling 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)
