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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 Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing B1935 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 1. If greater than the specified range, test the supply voltage circuit and the control circuit 3. Disconnect the X2, X5 harness connectors at the MSM.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
4. Test for 850-300k ohms between the temperature sensor 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 5. Connect the X1, X2, X5 harness connectors at the MSM. 6. Disconnect the harness connector at the seat back 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 If less than the specified range, test the signal circuit for a short to voltage. If the 8. If all circuits test normal, replace the MSM. B2180 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 6 and the control circuit terminal 4. If greater than the specified range, test the supply voltage circuit and the control circuit 3. Disconnect the X2, X5 harness connectors at the MSM. 4. Test for 850-300k ohms between the temperature sensor 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 5. Connect the X1, X2, X5 harness connectors at the MSM. 6. Disconnect the harness connector at the seat back heating element. 7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor signal circuit terminal C
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 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 Back Cushion Heater Replacement Control Module References for the MSM replacement, setup, and programming DTC B2345 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 Descriptor DTC B2345 00 Seat Heater Disable Circuit DTC B2345 13 Seat Heater Disable Circuit High Temperature DTC B2345 42 Seat Heater Disable Circuit Calibration Data Set Not Programmed DTC B2345 4B Seat Heater Disable Circuit Calibration Not Learned Diagnostic Fault Information
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The front seat heating elements are controlled by a common high current relay internal to the Conditions for Running the DTC The MSM must be powered. Conditions for Setting the DTC B2345 00 After a heated seat is activated, the MSM detects a shorted circuit on the seat heating element 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 Cushion B2508 02 B2425 0C B2425 0D B2508 01 - Left Heated Seat Back B2508 02 B1935 0C B2508 01 - Left Heated Seat Cushion B2508 02 B2425 0C B2425 0D B2508 01 - Right Heated Seat Back B2508 02 B2180 0C B2180 0D B2508 01 - Right Heated Seat Cushion B2508 02 B2430 0C B2430 0D B2508 01 - Right Heated Seat Back B2508 02 B2180 0C B2508 01 - Right Heated Seat Cushion B2508 02 B2430 0C B2508 01 -
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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