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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 130 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B1405, B1825, B2355, B2365, or B2375: Seat Position Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate driver seat motor listed below for which the DTC set:
    • M50D Seat Front Vertical Motor - Driver
    • M55D Seat Rear Vertical Motor - Driver
    • M51D Seat Horizontal Motor - Driver
    • M56D Seat Recline Motor - Driver
  2. Ignition ON.
  3. Test for greater than 10.8 V between the 12 V reference circuit terminal 2 and ground while pressing any power seat switch.
    • If 10.8 V or less 
    1. Ignition OFF, disconnect the X5 harness connector at the K40D Seat Memory Control Module - Driver.
    2. Test for infinite resistance between the 12 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the 12 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K40D Seat Memory Control Module - Driver.
    • If greater than 10.8 V 
  4. Test for 0.2-2 V between the signal circuit terminal 4 and ground.
    • If less than 0.2 V 
    1. Ignition OFF, disconnect the X5 harness connector at the K40D Seat Memory Control Module - Driver.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K40D Seat Memory Control Module - Driver.
    • If greater than 2 V 
    1. Ignition OFF, disconnect the X5 harness connector at the K40D Seat Memory Control Module - Driver, ignition ON.
    2. Test for less than 1 V between each signal circuit listed below and ground.
      • Front vertical sensor terminal 12
      • Seat horizontal sensor terminal 11
      • Rear vertical sensor terminal 25
      • Seat recline sensor terminal 26
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K40D Seat Memory Control Module - Driver.
    • If between 0.2-2 V 
  5. Test or replace the seat motor.
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