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9G-16 Seats:
DTC B2345
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provides an overview of each diagnostic
category.
DTC Descriptors
DTC B2345 00: Seat Heater Elements Short to Ground or Short to Battery
DTC B2345 4B: Seat Heater Elements Current Sensing Calibration Out of Range
DTC B2345 13: Seat Heater Elements Temperature Above Threshold
DTC B2345 42: Seat Heater Elements Current Sensing Calibration Not Programmed
Diagnostic Fault Information
Circuit
Driver Heated Seat Element Control
Driver Heated Seat Element Supply Voltage
Driver Heated Seat Temperature Sensor
Low Reference
Driver Heated Seat Temperature Sensor
Signal
Passenger Heated Seat Element Control
Passenger Heated Seat Element Supply
Voltage
Passenger Heated Seat Temperature
Sensor Low Reference
Passenger Heated Seat Temperature
Sensor Signal
Circuit/System Description
The heated seat heating elements are controlled by a
common high current relay internal to the heated seat
module and by individual low side element control
circuits. The heated seat module connects the heater
element supply voltage circuits for both seats to a
common reference point. This reference point is biased
to approximately 2 volts. Before the heated seat module
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 heated seat module must be powered.
Conditions for Setting the DTC
B2345 00
After the heated seat is activated, the heated seat
module detects a short on either the heating element
supply voltage circuit or control circuit.
Short to
Open/High
Ground
Resistance
B2345 00
B2425 0C
B2508 02
B2345 00
B2425 0C
B2508 02
B1925 05
—
B2425 1F
B1925 05
B1925 02
B2425 1F
B2345 00
B2430 0C
B2508 02
B2345 00
B2430 0C
B2508 02
B2170 05
—
B2430 1F
B2170 05
B2170 02
B2430 1F
B2345 13
Any temperature sensor input that remains below 1.5
volts for more that 1 second.
B2345 42
This DTC will set if the module calibration is not
programmed.
B2345 4B
This DTC will set if the module calibration is out of range.
Action Taken When the DTC Sets
The heated seat function for both passenger seats will
be disabled.
Conditions for Clearing the DTC
• The current DTC will clear and set the code to history
3 seconds after the reference voltage returns to
normal operating range and the ignition is cycled OFF
then back to ACC or RUN.
• The history DTC will clear after 50 consecutive fault-
free ignition cycles have occurred.
Signal
Short to Voltage
Performance
B2345 00
B2508 01
B2345 00
B2508 01
—
B1925 05
B2425 1F
B2345 00
B2508 01
B2345 00
B2508 01
—
B2170 05
B2430 1F
—
—
—
—
—
—
—
—
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Troubleshooting
