B2345

DTC B2345

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




Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

CIRCUIT/SYSTEM DESCRIPTION
The driver and passenger heated seat heating elements are controlled by a common high current relay internal to the memory seat module (MSM) and the low side by individual element control circuits. The MSM connects the heated seat heater element supply voltage circuits for both seats to a common reference point. This reference point is biased toapproximately 2.0 volts. Before the memory seat module will allow heated seat operation, it checks to see if this reference voltage is shorted to ground or battery voltage. Once the module verifies that it is not closing to 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 memory seat module (MSM) must be powered.

CONDITIONS FOR SETTING THE DTC

B2345 00
After the heated seat is activated, the MSM detects a shorted circuit on the seat heating element supply voltage circuit or control circuit.

B2345 13
Any temperature sensor input that remains below 1.5 volts for more than 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 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 50 consecutive fault-free ignition cycles have occurred.

CIRCUIT/SYSTEM TESTING

B2345 00
1. Ignition OFF, disconnect the (C1, C4) harness connectors at the MSM.
2. Test for infinite resistance between the driver seat heating element supply voltage circuit terminal 14 (C1) and ground.
- If less than infinite, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
3. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 14 (C1) and ground.
- If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
4. Test for infinite resistance between the passenger seat heating element supply voltage circuit terminal 6 (C1) and ground.
- If less than infinite, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
5. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 (C1) and ground.
- If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
6. If all circuits test normal, replace the memory seat module.

B2345 13
1. Ignition OFF, disconnect the (C2, C4) harness connectors at the memory seat module.
2. Test for greater than 3.0K ohms of resistance between the following seat cushion temperature sensor signal circuits and the low reference circuits:
- Driver seat cushion terminal 1 (C5) and terminal 3 (C2)
- Passenger seat cushion terminal 2 (C5) and terminal 6 (C2)
- If less than 3.0K ohms, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate temperature sensor.
3. Test for greater than 2.4K ohms of resistance between the following seat back temperature sensor signal circuits and the low reference circuits:
- Driver seat back terminal 4 (C5) and terminal 2 (C2)
- Passenger seat back terminal 3 (C5) and terminal 5 (C2)
- If less than 2.4K ohms, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate temperature sensor.
4. If all circuits test normal, replace the memory seat module.

B2345 42 or B2345 4B
If either DTC is set, the only option is module replacement.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Seat Back Heater Element Replacement - Front
- Seat Cushion Heater Element Replacement - Front
- Control Module References for the memory seat module replacement, setup and programming. Programming and Relearning