Chevrolet Silverado / GMC Sierra. Manual — part 2754
DTC B2430 1F
Right Seat Cushion Heater Circuit Intermittent
Diagnostic Fault Information
Circuit/System Description
When the heated seat function is active, the Memory Seat Module (MSM) supplies battery
voltage through the element supply voltage circuit to the seat heater elements. The module
controls the seat temperature by providing a pulse width modulated (PWM) ground through the
heated seat element control circuit to the seat heater elements. The module then monitors the
current flow through the heating element and the temperature sensor rate of change to verify
correct operation.
Conditions for Running the DTC
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Left Heated Seat Cushion
Element Supply Voltage
B2508 02
B2425 0C
B2425 0D
B2508 01
-
Left Heated Seat Cushion
Element Control
B2508 02
B2425 0C
B2425 0D
B2508 01
-
Left Heated Seat Cushion
Temperature Sensor Signal
B1925 02
B1925 05
B2425 04
B2425 1F
B1925 05
B2425 04
B2425 1F
-
Left Heated Seat Cushion
Temperature Low Reference
-
B1925 05
B2425 04
B2425 1F
-
-
Right Heated Seat Cushion
Element Supply Voltage
B2508 02
B2430 0C
B2430 0D
B2508 01
-
Right Heated Seat Cushion
Element Control
B2508 02
B2430 0C
B2430 0D
B2508 01
-
Right Heated Seat Cushion
Temperature Sensor Signal
B2170 02
B2170 05
B2430 04
B2430 1F
B2170 05
B2430 04
B2430 1F
-
Right Heated Seat Cushion
Temperature Low Reference
-
B2170 05
B2430 04
B2430 1F
-
-
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
The MSM must be powered and the heated seat must be enabled.
Conditions for Setting the DTC
B2425 04, B2430 04
The module does not detect a temperature change within 210 seconds.
B2425 0A, B2430 0A
The module detects that the set point temperature has not been reached within 8.5 minutes.
B2425 0B, B2425 0E, B2430 0B, B2430 0E
By measuring output current, the module calculates that the heating element resistance is below
the minimum resistance.
B2425 0C, B2445 0D, B2430 0C, B2430 0D
By measuring output current, the module calculates that the heating element resistance is above
the maximum resistance.
B2425 1F, B2430 1F
The temperature sensor voltage is erratic or changes suddenly.
Action Taken When the DTC Sets
The heated seat cushion function for the affected seat will be disabled.
Conditions for Clearing the DTC
The current DTC clears when the malfunction is no longer present, and the power mode
changes to 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
Heated/Cooled Seat Schematics
Connector End View Reference
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Component Connector End Views
Description and Operation
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
B2425
1. Ignition OFF, disconnect the X1 harness connector at the MSM.
2. Test for less than 15 ohms between the heater element supply voltage circuit terminal 14 and
the control circuit terminal 11.
If the resistance is greater than 15 ohms test the supply and control circuits for an
open/high resistance. If the circuits test normal replace the seat cushion heater element.
3. Disconnect the X2, X5 harness connectors at the MSM.
4. Test for 850-300k ohms between the temperature sensor signal circuit terminal 1 X5 and the
low reference circuit terminal 3 X2.
If greater than the specified range, test the signal circuit and low reference circuit for a
short to voltage or an open/high resistance. If the circuits test normal, replace the seat
cushion heater element.
If less than the specified range, test for a short between the signal and low reference
circuits. If the circuits test normal, replace the seat cushion heater element.
5. Connect the X1, X2, X5 harness connectors at the MSM.
6. Disconnect the harness connector at the seat cushion heater element.
7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor signal circuit terminal C
and ground.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
If greater than the specified range, test the signal circuit for a short to voltage. If the
circuit tests normal, replace the MSM.
If less than the specified range, test the signal circuit for a short to voltage. If the
circuit tests normal, replace the MSM.
8. If all circuits test normal, replace the MSM.
B2430 Front
1. Ignition OFF, disconnect the X1, X4 harness connector at the MSM.
2. Test for less than 15 ohms between the heater element supply voltage circuit terminal 6 X1
and the control circuit terminal 14 X4.
If the resistance is greater than 15 ohms test the supply and control circuits for an
open/high resistance. If the circuits test normal replace the seat cushion heater element.
3. Disconnect the X2, X5 harness connectors at the MSM.
4. Test for 850-300k ohms between the temperature sensor signal circuit terminal 2 X5 and the
low reference circuit terminal 6 X2.
If greater than the specified range, test the signal circuit and low reference circuit for a
short to voltage or an open/high resistance. If the circuits test normal, replace the seat
cushion heater element.
If less than the specified range, test for a short between the signal and low reference
circuits. If the circuits test normal, replace the seat cushion heater element.
5. Connect the X1, X2, X4, X5 harness connectors at the MSM.
6. Disconnect the harness connector at the seat cushion heater element.
7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor signal circuit terminal C
and ground.
If greater than the specified range, test the signal circuit for a short to voltage. If the
circuit tests normal, replace the MSM.
If less than the specified range, test the signal circuit for a short to voltage. If the
circuit tests normal, replace the MSM.
8. If all circuits test normal, replace the MSM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Driver Seat and Passenger Seat Cushion Heater Replacement
Control Module References for the MSM replacement, setup, and programming
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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