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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B1925 or B2170 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the MSM harness connector C5.
  2. Test for a minimum of 850 ohms of resistance from the signal circuit to ground.
    • If less than 850 ohms, test the signal circuit for a short to ground. If the circuit tests normal, replace the seat cushion heater element.
  3. If all circuits test normal, replace the MSM.
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