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DTC B2345 (With KA6)

DTC B2345 (With KA6)

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC B2345 13

Seat Heater Disable Circuit Low Voltage High/Temperature

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Left Rear Heated Seat Element Control Terminal 3 X2 B242A 02 B2425 0D B242A 01 B2425 0E
Left Rear Heated Seat Element Control Terminal 1 X2 B242A 02 B2425 0D B242A 01 B2425 0E
Left Rear Heated Seat Temperature Sensor Signal B1925 02 B1925 05 B1925 05 B2345 13
Left Rear Heated Seat Temperature Sensor Low Reference - B1925 05 - B2345 13
Right Rear Heated Seat Element Control Terminal 5 X2 B242A 02 B2430 0D B242A 01 B2430 0E
Right Rear Heated Seat Element Control Terminal 2 X2 B242A 02 B2430 0D B242A 01 B2430 0E
Right Rear Heated Seat Temperature Sensor Signal B2170 02 B2170 05 B2170 05 B2345 13
Right Rear Heated Seat Temperature Sensor Low Reference - B2170 05 - B2345 13


Circuit/System Description

The rear seat heating control module controls seat heating operation for both left and right rear seats. The heating elements are controlled through individual high side and low side control circuits. The low side control circuits for both seats are connected to a common reference point internal to the module. This reference point is biased to approximately 2.5 V. Before the rear seat heating control module will allow heated seat operation, it checks to see if this biased voltage is shorted to ground or voltage. Once the module verifies that it is not closing to a shorted heating element, it allows for heated seat operation. The module will then continue to monitor the heating elements for a shorted circuit.

Conditions for Running the DTC

The rear seat heating control module must be powered.

Conditions for Setting the DTC

B2345 13

Any temperature sensor input that remains below 1.5 V for more than 1 second.

Action Taken When the DTC Sets

The heated seat function for both rear 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 the normal operating range and the ignition is cycled OFF then back to ACC or RUN.

• The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.


Reference Information

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Rear Heated Seats Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing


1. Ignition OFF, disconnect the X2, X3 harness connectors at the K29R rear seat heating control module.

2. Test for greater than 3.0 kΩ between the signal and the low reference circuits listed below:

• E14F left rear seat cushion terminal 3 X3 and terminal 13 X2

• E14H right rear seat cushion terminal 4 X3 and terminal 14 X2

3. If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate E14 seat cushion heating element.

4. If all circuits test normal, replace the K29R rear seat heating control module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Rear Seat Cushion Heater Replacement (40 Percent Seat) Rear Seat Cushion Heater Replacement (60 Percent Seat)

• Control Module References for rear seat heating control module replacement, setup, and programming