2010 Cadillac CTS Sedan AWD V6-3.0L Page 2050

2010 Cadillac CTS Sedan AWD V6-3.0L Page 2050

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

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/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 Testing

Yaw Rate Sensor DTC U1826

1. Use the DTC Descriptor and Diagnostic Aids above, determine the module that is not communicating that should be tested.

2. Ignition OFF, disconnect the harness connector at the Yaw Rate Sensor.

3. Ignition ON, verify that a test lamp illuminates between the Yaw Rate Sensor voltage (12-volt ref) circuit terminal 1 and ground.

瀚慖f the test lamp does not illuminate, test the circuit for a short to ground, or open/high resistance. If the circuit tests normal, replace the

EBCM.

4. Ignition OFF, test for less than 5 ohms between the Yaw Rate Sensor low reference circuit terminal 6 and ground.

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

5. Test for less than 1 ohm in the CAN bus serial data circuits between the Yaw Rate Sensor terminals 3 and 2, and the EBCM connector 21 and

33.

瀚慖f greater than 1 ohm, test the serial data circuits for open/high resistance.

6. If all circuits test normal, replace the yaw rate sensor.

Steering Wheel Position Sensor (Steering Angle Sensor) DTC U1827

1. Use the DTC Descriptor and Diagnostic Aids above, determine the module that is not communicating that should be tested.

2. Ignition OFF, disconnect the harness connector at the Steering Wheel Position Sensor.

3. Ignition ON, verify that a test lamp illuminates between the Steering Wheel Position Sensor voltage (12-volt ref) circuit terminal 5 and

ground.

瀚慖f the test lamp does not illuminate, test the circuit for a short to ground, or open/high resistance. If the circuit tests normal, replace the

Steering Wheel Position Sensor.

4. Ignition OFF, test for less than 5 ohms between the Steering Wheel Position Sensor low reference circuit terminal 6 and ground.

瀚慖f greater than the specified value, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the Steering

Wheel Position Sensor.

5. Test for less than 1 ohm in the CAN bus serial data circuits between the Steering Wheel Position Sensor terminal 2 and 3, and the Yaw Rate

Sensor terminal 5 and 4.

瀚慖f greater than 1 ohm, test the serial data circuits for open/high resistance.

6. If all circuits test normal, replace the Steering Wheel Position Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

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

* Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction

Control Systems/Yaw Rate Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming