2010 Cadillac CTS Sedan AWD V6-3.6L Page 537
2. Ignition OFF, test for less than 2.0 ohms between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal B and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the MSM.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
4. Verify the scan tool Telescope or Tilt Sensor parameter is less than 0.2 volt.
瀚慖f greater than the specified range, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the MSM.
5. Install a 3A fused jumper wire between the signal circuit terminal C and the 5-volt reference circuit terminal B. Verify the scan tool
Telescope or Tilt Sensor parameter is greater than 4.8 volts.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the MSM.
6. If all circuits test normal, test or replace the telescope or tilt actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Steering Column Replacement (See: Steering and Suspension/Steering/Steering Column/Service and Repair/Steering Column Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for MSM replacement, setup, and programming
B2890
DTC B2890
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category
DTC Descriptor
DTC B2890 4B
- Tilt and Telescope Motor Circuit Calibration Not Learned
Circuit Description
The memory seat module (MSM) learns tilt/telescope soft stops approximately 1.3 cm (0.5 in) from the mechanical ends of travel. The system uses
soft stops to prevent wear on the system by ensuring that the steering column movement stops before it reaches its mechanical end of travel in any
direction. The soft stops are initially programmed at the factory. The stop positions may be reprogrammed, which is necessary any time the MSM is
replaced.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
The soft stops have not been learned.
Action Taken When the DTC Sets
* The tilt and telescope motors will be deactivated.
* Memory recall functions will be disabled.
Conditions for Clearing the DTC
