2010 Cadillac CTS Sedan AWD V6-3.6L Page 478
瀚慖f greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the seat cushion
heating element.
7. If all circuits test normal, replace the MSM.
B2430 0D or B2430 0E
1. Ignition OFF, disconnect the X3 harness connector at the MSM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X3 harness connector at the MSM and disconnect the harness connector at the seat back heating element.
Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with
the seat occupied.
4. Test for 1.7 - 7.0 Ohms between the control circuit terminal A and control circuit terminal B.
瀚慖f less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat back heating
element.
瀚慖f greater than the specified range, replace the seat back heating element.
5. Connect the harness connector at the seat back heating element and disconnect the X1, X4 harness connectors at the MSM.
6. Test for 1.7 - 7.0 Ohms between the control circuit terminal 14 X1 and the control circuit terminal 14 X4.
瀚慖f less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat cushion heating
element.
瀚慖f greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the seat cushion
heating element.
7. 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
B2455
DTC B2455
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) provide an overview of each diagnostic category.
DTC Descriptor
DTC B2455 01
- Cellular Phone Microphone Circuit Short to Battery
DTC B2455 02
- Cellular Phone Microphone Circuit Short to Ground
DTC B2455 04
- Cellular Phone Microphone Circuit Open Circuit
Diagnostic Fault Information
