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DTC B2508 OR B2509 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 B2508 01 Seat Heater Relay Circuit Shorted to Battery or Open DTC B2508 02 Seat Heater Relay Circuit Shorted to Ground Diagnostic Fault Information Circuit/System Description 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
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 B2508 02 Before the heated seats are activated, the MSM detects a short to ground on the seat heating B2508 01 Before the heated seats are activated, the MSM detects a short to battery voltage on the seat Action Taken When the DTC Sets The heated seat function 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
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 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.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 SYMPTOMS - SEAT HEATING AND COOLING 1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link. 2. Review the system operation in order to familiarize yourself with the system functions. Refer to Heated Seats Description and Operation. Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the system. Refer to Inspect the easily accessible or visible system components for obvious damage or conditions Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Symptom List Refer to Heated Seat Inoperative in order to diagnose the symptom. HEATED SEAT INOPERATIVE Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. IMPORTANT: The following steps must be completed before using the symptom tables.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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