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 4B: Front Seat Heater Current Sensing Calibration Out of RangeDTC B2345 13: Front Seat Heater Temperature Above Threshold
DTC B2345 42: Front Seat Heater Current Sensing Calibration Not Present
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ MSM Terminal 5 X3 | 1, B2425 0D, B2430 0D | 1, B2425 0D, B2430 0D | -- | -- |
Driver Heated Seat Element Supply Voltage | B2508 02 | B2425 0D | B2508 01 | B2425 0E |
Driver Heated Seat Element Control | B2508 02 | B2425 0D | B2508 01 | B2425 0E |
Driver Heated Seat Temperature Sensor Signal | B1925 02 | B1925 05 | B1925 05 | B2345 13, B2345 42, B2345 4B |
Driver Heated Seat Temperature Sensor Low Reference | -- | B1925 05 | -- | B2345 13, B2345 42, B2345 4B |
Passenger Heated Seat Element Supply Voltage | B2508 02 | B2430 0D | B2508 01 | B2430 0E |
Passenger Heated Seat Element Control | B2508 02 | B2430 0D | B2508 01 | B2430 0E |
Passenger Heated Seat Temperature Sensor Signal | B2170 02 | B2170 05 | B2170 05 | B2345 13, B2345 42, B2345 4B |
Passenger Heated Seat Temperature Sensor Low Reference | -- | B2170 05 | -- | B2345 13, B2345 42, B2345 4B |
1. Power seats inoperative | ||||
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 volts. 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.
Conditions for Setting the DTC
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 present.
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 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. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Heated/Vented Seat Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
B2345 13
- Ignition OFF, disconnect the X2, X5 harness connector at the MSM.
- Test for greater than 1.4K ohms between the signal and low reference circuits listed below:
- If all circuits test normal, replace the MSM.
| • | Driver seat cushion terminal 1 X5 and terminal 3 X2 |
| • | Passenger seat cushion terminal 2 X5 and terminal 6 X2. |
| ⇒ | 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 temperature sensor. |
B2345 42 or B2345 4B
If either DTC is set, replace the MSM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for MSM replacement, setup, and programming |
