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DIAGNOSTIC STARTING POINT - SEATS Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic The identification of the control modules which command the system. The ability of the control modules to communicate through the serial data circuit. The identification of any stored diagnostic trouble codes (DTCs) and their status. The use of the Diagnostic System Check will identify the correct procedure for diagnosing the DTC B1925 OR B2170 Diagnostic Instructions B2425 1F: Left Seat Cushion Heater Circuit Intermittent B2430 04: Right Seat Cushion Heater Circuit Open B2430 0A: Right Seat Cushion Heater Circuit Rate of Change Below Threshold B2430 0B: Right Seat Cushion Heater Circuit Current Above Threshold B2430 0C: Right Seat Cushion Heater Circuit Current Below Threshold B2430 0D: Right Seat Heater Cushion Circuit Resistance Above Threshold B2430 0E: Right Seat Heater Cushion Circuit Resistance Below Threshold B2430 1F: Right Seat Cushion Heater Circuit Intermittent DTC B2435 or B2440 B2435 02: Left Seat Back Heater Sensor Circuit Shorted to Ground B2435 05: Left Seat Back Heater Sensor Circuit Shorted to Battery or Open B2440 02: Right Seat Back Heater Sensor Circuit Shorted to Ground B2440 05: Right Seat Back Heater Sensor Circuit Shorted to Battery or Open DTC B2508 or B2509 B2508 01: Seat Heater Relay Circuit Shorted to Battery or Open B2508 02: Seat Heater Relay Circuit Shorted to Ground
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 B1925 02 Left Seat Heater Cushion Sensor Circuit Shorted to Ground DTC B1925 05 Left Seat Heater Cushion Sensor Circuit Shorted to Battery or Open DTC B2170 02 Right Seat Heater Cushion Sensor Circuit Shorted to Ground DTC B2170 05 Right Seat Heater Cushion 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 Cushion B2508 02 B2425 0C B2425 0D B2508 01 - Left Heated Seat Cushion B2508 02 B2425 0C B2425 0D B2508 01 - Left Heated Seat Cushion B1925 02 B1925 05 B2425 1F B1925 05 B2425 1F - Left Heated Seat Cushion - B1925 05 B2425 1F - - Right Heated Seat Cushion B2508 02 B2430 0C B2430 0D B2508 01 - Right Heated Seat Cushion B2508 02 B2430 0C B2430 0D B2508 01 -
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 cushion just under the seat cover with the Conditions for Running the DTC The memory seat module must be powered. Conditions for Setting the DTC B1925 02, B2170 02 The temperature sensor voltage drops below 0.80 volt for more than 1 second. B1925 05, B2170 05 The temperature sensor voltage is greater than 5 volts for more than 1 second. 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 will clear 3 seconds after the reference voltage returns to normal operating A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs Reference Information Right Heated Seat Cushion B2170 02 B2170 05 B2430 1F B2170 05 B2430 1F - Right Heated Seat Cushion - B2170 05 B2430 1F - -
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 B1925 1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM. 2. Test for 850-300k ohms between the 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 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 cushion heater element. 5. 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
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