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DTC B2435 OR B2440 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 B2435 02 Left Seat Back Heater Sensor Circuit Shorted to Ground DTC B2435 05 Left Seat Back Heater Sensor Circuit Shorted to Battery or Open DTC B2440 02 Right Seat Back Heater Sensor Circuit Shorted to Ground DTC B2440 05 Right Seat Back Heater Sensor Circuit Shorted to Battery or Open Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Left Heated Seat Back B2508 02 B1935 0C B1935 0D B2508 01 - Left Heated Seat Back B2508 02 B1935 0C B1935 0D B2508 01 - Left Heated Seat Back B2435 02 B1935 04 B1935 1F B2435 05 B1935 04 B1935 1F B2435 05 - Left Heated Seat Back - B1935 04 B1935 1F B2435 05 - - Right Heated Seat Back B2180 0C
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The heated seat temperature sensor is located in the seat back just under the seat cover with the Conditions for Running the DTC The heated seat system must be active. Conditions for Setting the DTC B2435 02, B2440 02 The temperature sensor voltage drops below 0.8 volt for more than 1 second. B2435 05, B2440 05 The temperature sensor voltage is greater than 5 volts for more than 1 second. Action Taken When the DTC Sets The heated seat back function for the affected seat will be disabled. Conditions for Clearing the DTC The current DTC will clear 3 seconds after the reference voltage returns to normal operating Element Supply Voltage B2508 02 B2180 0D B2508 01 - Right Heated Seat Back B2508 02 B2180 0C B2180 0D B2508 01 - Right Heated Seat Back B2440 02 B2180 04 B2180 1F B2440 05 B2180 04 B2180 1F B2440 05 - Right Heated Seat Back - B2180 04 B2180 1F B2440 05 - -
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs 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 Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing B2435 1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM. 2. Test for 850-300k ohms between the signal circuit terminal 4 X5 and the low reference circuit terminal 2 X2. If greater than the specified range, test the signal circuit and low reference circuit for a If less than the specified range, 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. Connect the X2, X5 harness connectors at the MSM. 4. Disconnect the harness connector at the seat back heater element. 5. 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 If less than the specified range, test the signal circuit for a short to voltage. If the 6. If all circuits test normal, replace the MSM. B2440 1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM. 2. Test for 850-300k ohms between the signal circuit terminal 3 X5 and the low reference circuit terminal 5 X2. If greater than the specified range, test the signal circuit and low reference circuit for a If less than the specified range, test for a short between the signal and low reference 3. Connect the X2, X5 harness connectors at the MSM. 4. Disconnect the harness connector at the seat back heater element. 5. 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 If less than the specified range, test the signal circuit for a short to voltage. If the 6. 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 Back 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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