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B2345 13 Any of the temperature sensor inputs remains below 1.5 volts for a seat back or 0.95 volts for a B2345 42 The current sensing calibration data is out of range. B2345 4B The current sensing calibration data is not programmed. Action Taken When the DTC Sets The heated seat functions for both seats will be disabled. Conditions for Clearing the DTC The current DTC clears when the malfunction is no longer present and the power mode 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 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing B2345 00 1. Ignition OFF, disconnect the X1, X4 harness connectors at the MSM. 2. Test for infinite resistance between the driver seat heating element supply voltage circuit terminal 14 X1 and ground. If less than the specified range, test the supply voltage circuit and the seat cushion and 3. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 14 X1 and ground. If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat 4. Test for infinite resistance between the passenger seat heating element supply voltage circuit terminal 6 X1 and ground. If less than the specified range, test the supply voltage circuit and the seat cushion and 5. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 X1 and ground. If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat 6. If all circuits test normal, replace the MSM. B2345 13 1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM. 2. Test for greater than 850 ohms between the following seat cushion temperature sensor signal circuits and the low reference circuits: 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3. Test for greater than 850 ohms between the following seat back temperature sensor signal circuits and the low reference circuits: Driver seat back terminal 4 X5 and terminal 2 X2 Passenger seat back terminal 3 X5 and terminal 5 X2 If less than the specified value, test for a short between the signal and low reference 4. If the circuits test normal replace the MSM. B2345 42 or B2345 4B If this DTC is retrieved as a current DTC, replace the MSM. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Driver Seat and Passenger Seat Back Cushion Heater Replacement Driver Seat and Passenger Seat Cushion Heater Replacement Control Module References for the MSM replacement, setup, and programming DTC B2425 OR B2430 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 B2425 04 Left Seat Cushion Heater Circuit Open DTC B2425 0A Left Seat Cushion Heater Circuit Rate of Change Below Threshold DTC B2425 0B
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Left Seat Cushion Heater Circuit Current Above Threshold DTC B2425 0C Left Seat Cushion Heater Circuit Current Below Threshold DTC B2425 0D Left Seat Heater Cushion Circuit Resistance Above Threshold DTC B2425 0E Left Seat Heater Cushion Circuit Resistance Below Threshold DTC B2425 1F Left Seat Cushion Heater Circuit Intermittent DTC B2430 04 Right Seat Cushion Heater Circuit Open DTC B2430 0A Right Seat Cushion Heater Circuit Rate of Change Below Threshold DTC B2430 0B Right Seat Cushion Heater Circuit Current Above Threshold DTC B2430 0C Right Seat Cushion Heater Circuit Current Below Threshold DTC B2430 0D Right Seat Heater Cushion Circuit Resistance Above Threshold DTC B2430 0E Right Seat Heater Cushion Circuit Resistance Below Threshold
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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