B2425
DTC B2425 or B2430
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2425
^ Driver Seat Heater Circuit
DTC B2430
^ Passenger Seat Heater Circuit
Diagnostic Fault Information
Circuit/System Description
The memory seat module (MSM) controls the voltage supply and the ground circuits to the seat heater elements. When a heated seat function is commanded active, the MSM will switch battery voltage to the heater element supply circuits, and ground is provided through low side drive control circuits. During heated seat operation both the seat back and cushion heater elements are supplied battery voltage. The MSM grounds the appropriate control circuits for back only or back and cushion heating modes, and opens or closes the active control circuits as necessary in order to maintain the desired seat temperature.
Conditions for Running the DTC
* The battery voltage must be between 9-16 volts.
* Heated seat operation is attempted.
Conditions for Setting the DTC
* One of the low side drive control circuits is shorted to voltage or ground.
* One of the heater element voltage supply circuits is shorted to voltage or ground.
Action Taken When the DTC Sets
The seat module will disable heated seat operation.
Conditions for Clearing the DTC
* This DTC will clear on current status after the condition for setting the fault is corrected.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics ()
Connector End View Reference
Component Connector End Views ()
Description and Operation
Heated Seats Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Control Module References) for scan tool information
Circuit/System Testing
B2425
1. Ignition OFF, disconnect the X3 harness connector at the MSM.
2. Test for infinite resistance between the driver seat heating element supply voltage circuit terminal B12 and ground.
• If less than the specified range, 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 B12 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. If all circuits test normal, replace the MSM.
B2430
1. Ignition OFF, disconnect the X3 harness connector at the MSM.
2. Test for infinite resistance between the passenger seat heating element supply voltage circuit terminal B9 and ground.
• If less than the specified range, 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 B9 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. If all circuits test normal, replace the MSM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Control Module References) for MSM replacement, programming, and setup.