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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 272 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, B1820, B1830, B1835, B1840, or B1845: Seat Switch Circuits >> 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.
  1. Ignition OFF, disconnect the X1 and X2 harness connectors at the S64D Seat Adjuster Switch - Driver, ignition ON.
  2. Verify that all scan tool driver seat switch parameters listed below are Inactive:
    • Driver Seat Cushion Front Vertical Switch
    • Driver Seat Cushion Rear Vertical Switch
    • Driver Seat Horizontal Switch
    • Driver Seat Back Switch
    • Driver Lumbar Support Horizontal Switch
    • Driver Seat Back Side Bolster Switch - with AHE
    • If not Inactive 
    1. Ignition OFF, disconnect the X5 harness connector at the K40D Seat Memory Control Module - Driver.
    2. Test for infinite resistance between the appropriate signal circuit terminal listed below and ground:
      • Front vertical up switch terminal 1 X1
      • Front vertical down switch terminal 5 X1
      • Rear vertical up switch terminal 8 X1
      • Rear vertical down switch terminal 10 X1
      • Horizontal forward switch terminal 3 X1
      • Horizontal rearward switch terminal 7 X1
      • Recline forward switch terminal 4 X1
      • Recline rearward switch terminal 9 X1
      • Driver seat side bolster inflate terminal 1 X2
      • Driver seat side bolster deflate terminal 5 X2
      • Driver seat lumbar forward terminal 2 X2
      • Driver seat lumbar rearward terminal 6 X2
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K40D Seat Memory Control Module - Driver.
    • If Inactive 
  3. Install a 3 A fused jumper wire between the appropriate signal circuit terminal listed below and the ground circuit terminal 5, ignition ON.
    • Front vertical up switch terminal 1 X1
    • Front vertical down switch terminal 5 X1
    • Rear vertical up switch terminal 8 X1
    • Rear vertical down switch terminal 10 X1
    • Horizontal forward switch terminal 3 X1
    • Horizontal rearward switch terminal 7 X1
    • Recline forward switch terminal 4 X1
    • Recline rearward switch terminal 9 X1
    • Driver seat side bolster inflate terminal 1 X2
    • Driver seat side bolster deflate terminal 5 X2
    • Driver seat lumbar forward terminal 2 X2
    • Driver seat lumbar rearward terminal 6 X2
  4. Verify the appropriate scan tool seat switch parameter is Forward/Rearward or UP/Down.
    • If not Forward/Rearward or UP/Down 
    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 the signal circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF.
    4. 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 Forward/Rearward or UP/Down 
  5. Test or replace the S64D Seat Adjuster Switch - Driver.
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