2010 Cadillac CTS Sedan AWD V6-3.6L Page 401
Diagnostic Aids
* A high or low voltage DTC set in multiple modules indicates a concern in the charging system. Refer to Charging System Test (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Charging System Test)
* This DTC may be set by overcharging with a battery charger, or jump by starting.
* Inspect the ground connection G201, and ensure that it is clean and tight.
Reference Information
Schematic Reference
* Starting and Charging Schematics (See: Starting and Charging/Diagrams/Electrical Diagrams)
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Charging System Description and Operation (See: Starting and Charging/Charging 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)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be
between 12.6 and 15.0 V.
瀚慖f not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and Inspection/Component Tests
and General Diagnostics/Charging System Test)
2. Observe the scan tool BCM Battery Voltage parameter. The reading should be between 12.6 and 15.0 V.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connectors at the BCM.
2. Ignition OFF, test for less than 3.0 Ohms between the ground circuit terminal 9 X4 and ground.
瀚慖f not within the specified range, test the ground circuit for an open/high resistance.
3. Ignition On, verify a test lamp illuminates between the B+ circuits listed below and ground.
* Terminal 3 X3
* Terminal 10 X4
瀚慖f the test lamp does not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
4. If all the circuits test normal, test or replace the BCM.
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 BCM replacement, setup, and programming.
B1527
DTC B1527
Diagnostic Instructions
