2010 Cadillac CTS Sedan AWD V6-3.6L Page 459

2010 Cadillac CTS Sedan AWD V6-3.6L Page 459

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

B2345

DTC B2345

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 Descriptors

DTC B2345 4B

- Front Seat Heater Current Sensing Calibration Out of Range

DTC B2345 13

- Front Seat Heater Temperature Above Threshold

DTC B2345 42

- Front Seat Heater Current Sensing Calibration Not Present

Diagnostic Fault Information

Circuit/System Description

The heated seat heating elements are controlled by a common high current relay internal to the memory seat module (MSM) and by individual low

side element control circuits. The MSM connects the heater element supply voltage circuits for both seats to a common reference point. This

reference point is biased to approximately 2.5 V. Before the MSM will allow heated seat operation, it checks to see if the heating element supply

voltage circuits and control circuits are shorted to ground or voltage. Once the module verifies that it is not closing into a shorted heating element, it

allows heated seat operation. After which it continues to monitor for a shorted a circuit.

Conditions for Running the DTC

The MSM must be powered.