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Description and Operation Memory 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 Verification Ignition ON, observe the scan tool Driver Seat and Lumbar position sensor parameters. The Circuit/System Testing B1825 1. Ignition OFF, disconnect the harness connector X2 at the seat recline motor. 2. Ignition OFF, test for less than 2 ohms of resistance between the low reference circuit terminal 1 and ground. If greater than 2 ohms, test the low reference circuit for an open/high resistance. If the 3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground. If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the 4. Verify the scan tool Driver Seat Recline Sensor parameter is less than 2.0 volts. If greater than 2.0 volts, test the signal circuit terminal 2 for a short to voltage. If the 5. Install a 3A fused jumper wire between the signal circuit terminal 2 and the 5-volt reference
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
circuit terminal 3. Verify the scan tool Driver Seat Recline Sensor parameter is greater than If less than 4.65 volts, test the signal circuit for short to ground or an open/high 6. If all circuits test normal, test or replace the seat recline position sensor. B2355, B2365, B2375 1. Ignition OFF, disconnect the harness connector X2 at the seat adjuster motor assembly. 2. Ignition OFF, test for less than 2 ohms of resistance between the low reference circuit terminal 2 and ground. If greater than 2 ohms, test the low reference circuit for an open/high resistance. If the 3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 6 and ground. If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the 4. Verify the appropriate scan tool Driver Seat Sensor parameter is less than 2.0 volts. If greater than 2.0 volts, test the appropriate signal circuit for a short to voltage. If the Seat front vertical position sensor terminal 1 Seat rear vertical position sensor terminal 5 Seat horizontal position sensor terminal 3 5. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit terminal 6. Verify the appropriate scan tool Driver Seat position sensor parameter is greater Seat front vertical position sensor terminal 1 Seat rear vertical position sensor terminal 5 Seat horizontal position sensor terminal 3 If less than 4.65 volts, test the signal circuit for short to ground or an open/high 6. If all circuits test normal, test or replace the seat adjuster motor assembly. B1850, B1860
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Ignition OFF, disconnect the harness connector X2 at the seat lumbar motor assembly. 2. Ignition OFF, test for less than 2 ohms of resistance between the low reference circuit terminal C and ground. If greater than 2 ohms, test the low reference circuit for an open/high resistance. If the 3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground. If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the 4. Verify the appropriate scan tool Lumbar Sensor parameter is less than 2.0 volts. If greater than 2.0 volts, test the appropriate signal circuit for a short to voltage. If the Lumbar vertical position sensor terminal B Lumbar horizontal position sensor terminal D 5. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit terminal C. Verify the appropriate scan tool Lumbar Sensor parameter is greater than 4.65 Lumbar vertical position sensor terminal B Lumbar horizontal position sensor terminal D If less than 4.65 volts, test the signal circuit for short to ground or an open/high 6. If all circuits test normal, test or replace the lumbar motor assembly. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Front Seat Adjuster Replacement (Power) Front Seat Lumbar Support Replacement Front Seat Recliner Actuator Motor Replacement Control Module References for MSM replacement, setup, and programming DTC B3920 OR B3921 Diagnostic Instructions
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Power Seats - 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 B3920 01 Group 1 Seat Motors Circuit Shorted to Battery or Open DTC B3920 02 Group 1 Seat Motors Circuit Shorted to Ground Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Driver Seat Front Vertical B3920 02 1 B3920 01 - Driver Seat Front Vertical B3920 02 1 B3920 01 - Driver Seat Rear Vertical B3920 02 1 B3920 01 - Driver Seat Rear Vertical B3920 02 1 B3920 01 - Driver Seat Horizontal Motor B3920 02 1 B3920 01 - Driver Seat Horizontal Motor B3920 02 1 B3920 01 - Driver Seat Recline Motor B3920 02 1 B3920 01 - Driver Seat Recline Motor B3920 02 1 B3920 01 - Driver Seat Lumbar Motor B3920 02 1 B3920 01 - Driver Seat Lumbar Motor B3920 02 1 B3920 01 - Driver Seat Lumbar Motor Up
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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