LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 272 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B3920 : Seat Motors Group 1 Common Circuit (With W2E) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

B3920 01 or B3920 02

  1. Ignition OFF, disconnect the X3 harness connector at the appropriate K40 Seat Memory Control Module - Driver or Passenger.
  2. Test for infinite resistance between each control circuit terminal listed below and ground:
    • Seat front vertical motor up control terminal 3
    • Seat front vertical motor down control terminal 4
    • Seat rear vertical motor up control terminal 5
    • Seat rear vertical motor down control terminal 6
    • Seat horizontal motor forward control terminal 11
    • Seat horizontal motor rearward control terminal 12
    • Seat recline motor forward control terminal 1
    • Seat recline motor rearward control terminal 2
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  3. Ignition ON.
  4. Test for less than 1 V between each control circuit terminal listed below and ground:
    • Seat front vertical motor up control terminal 3
    • Seat front vertical motor down control terminal 4
    • Seat rear vertical motor up control terminal 5
    • Seat rear vertical motor down control terminal 6
    • Seat horizontal motor forward control terminal 11
    • Seat horizontal motor rearward control terminal 12
    • Seat recline motor forward control terminal 1
    • Seat recline motor rearward control terminal 2
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  5. Replace the K40 Seat Memory Control Module.

B3920 00 or B3920 0B

  1. Ignition ON.
  2. Clear the current and history DTC.
  3. Determine which motor set this DTC by operating each seat motor listed below one at a time in both directions. Check for the DTC to set between each motor test.
    • M50 Seat Front Vertical Motor
    • M55 Seat Rear Vertical Motor
    • M51 Seat Horizontal Motor
    • M56 Seat Back Recline Motor
  4. Ignition OFF, disconnect the harness connector at the appropriate seat motor for which the DTC set, ignition ON.
  5. Clear the DTC.
  6. Verify that DTC B3920 00 or B3920 0B does not set while operating the appropriate seat switch in both directions.
    • If DTC B3920 00 or B3920 0B sets 
    1. Ignition OFF, Disconnect the X3 harness connector at the K40 Seat Memory Control Module.
    2. Test for infinite resistance between the control circuits.
      • If less than infinite resistance, repair the short between the circuits.
      • If infinite resistance
    3. Test for less than 2 Ω in each control circuit end to end:
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K40 Seat Memory Control Module.
    • If DTC B3920 00 or B3920 0B does not set 
  7. Test or replace the seat motor.
scientia non olet · About LEMON Manuals