2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 573
- Seat Heater Disable Circuit Voltage Low / High Temperature
DTC B2345 42
- Seat Heater Disable Circuit Calibration Data Set Not Programmed
DTC B2345 4B
- Seat Heater Disable Circuit Calibration Not Learned
Diagnostic Fault Information
Circuit/System Description
The front seat heating elements are controlled by a common high current relay internal to the rear heated seat control module (RHSM) and on the
low side by individual element control circuits. The RHSM connects the seat heater element supply voltage circuits to a common reference point.
This reference point is biased to approximately 2.5 V. Before the RHSM will allow heated seat operation, it checks to see if the heating element
supply voltage circuits and control circuits are shorted to ground or battery voltage. Once the RHSM 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 circuit.
Conditions for Running the DTC
The RHSM must be powered.
Conditions for Setting the DTC
B2345 00
After a heated seat is activated, the RHSM detects a shorted circuit on the seat heating element supply voltage circuit or control circuit.
B2345 13
Any of the temperature sensor inputs remains below 1.45 V for more than 1 second.
B2345 42
The current sensing calibration is not programmed.
B2345 4B
The current sensing calibration is out of range.
Action Taken When the DTC Sets
The heated seat function for both seats will be disabled.
Conditions for Clearing the DTC
* The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to ACC or RUN.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.
