2010 Cadillac CTS Sedan AWD V6-3.6L Page 456
Heated/Vented Seat Description and Operation (See: Body and Frame/Seats/Seat Temperature Element/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
B1925 02 or B1925 05
1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
2. Test for 1.4 k-300 kOhms between the signal circuit terminal 1 X5 and the low reference circuit terminal 3 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
temperature sensor.
瀚慖f greater than the specified range , test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the
circuits test normal, replace the seat temperature sensor.
3. Ignition OFF, connect the X2, X5 harness connectors at the MSM.
4. Disconnect the harness connector at the seat cushion heating element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the MSM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
6. If all circuits test normal, replace the MSM.
B2170 02 or B2170 05
1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
2. Test for 1.4k - 300 kOhms between the signal circuit terminal 2 X5 and the low reference circuit terminal 6 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
temperature sensor.
瀚慖f greater than the specified range, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the
circuits test normal, replace the seat temperature sensor.
3. Ignition OFF, connect the X2, X5 harness connectors at the MSM.
4. Disconnect the harness connector at the seat cushion heating element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the MSM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
6. If all circuits test normal, replace the MSM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Driver or Passenger Seat Back Cushion Heater Replacement (KA1) (See: Body and Frame/Seats/Seat Temperature Element/Service and
Repair/Driver or Passenger Seat Back Cushion Heater Replacement (KA1))
* Driver Seat Cushion Heater Replacement (KA1) (See: Body and Frame/Seats/Service and Repair/Driver Seat Cushion Heater Replacement
(KA1))
* Passenger Seat Cushion Heater Replacement (KA1) (See: Body and Frame/Seats/Service and Repair/Passenger Seat Cushion Heater
Replacement (KA1))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming
B2170
DTC B1925 or B2170
Diagnostic Instructions
