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Circuit/System Testing

Driver Seat Adjuster Switch Circuit Test

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S64D Driver Seat Adjuster Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10Ω between the ground circuit terminal E and ground.
    • If 10Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 10Ω 
  3. 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
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K40 Seat Memory Control Module.
    2. Test for infinite resistance between the appropriate signal circuit terminal listed below and ground:
      • Front vertical upward switch terminal A
      • Front vertical downward switch terminal K
      • Rear vertical upward switch terminal F
      • Rear vertical downward switch terminal J
      • Horizontal forward switch terminal D
      • Horizontal rearward switch terminal C
      • Recline forward switch terminal H
      • Recline rearward switch terminal G
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K40 Seat Memory Control Module.
    • If Inactive 
  4. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and the ground circuit terminal B.
    • Front vertical upward switch terminal A
    • Front vertical downward switch terminal K
    • Rear vertical upward switch terminal F
    • Rear vertical downward switch terminal J
    • Horizontal forward switch terminal D
    • Horizontal rearward switch terminal C
    • Recline forward switch terminal H
    • Recline rearward switch terminal G
  5. Verify the scan tool seat switch parameter is Forward/Rearward or UP/Down.
    • If not Forward/Rearward or UP/Down 
    1. Ignition OFF, disconnect the harness connector at the K40 Seat Memory Control Module, ignition ON.
    2. Test for less than 1V between the signal circuit terminal and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Ignition OFF.
    4. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K40 Seat Memory Control Module.
    • If Forward/Rearward or UP/Down 
  6. Test or replace the S64D Driver Seat Adjuster Switch.

Seat Motor Control Circuit Test

  1. Ignition OFF, disconnect the X4 harness connector at the K40 Seat Memory Control Module.
  2. Test for less than 10Ω between each ground circuit terminal listed below and ground:
    • terminal 3
    • terminal 6
    • If 10Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
    • If 2Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 10Ω 
  3. Ignition ON.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate. 
    1. Ignition OFF.
    2. Test for less than 2Ω in the B+ circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, verify the circuit breaker is OK and there is voltage at the circuit breaker.
    • If the test lamp illuminates. 
  5. Ignition OFF, connect the X4 harness connector at the K40 Seat Memory Control Module and disconnect the harness connector at the appropriate seat motor listed below:
    • M51D Seat Horizontal Motor
    • M50D Seat Front Vertical Motor
    • M55D Seat Rear Vertical Motor
    • M56D Seat Recline Motor
  6. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5, ignition ON.
    7. NOTE:

    Once a seat motor is commanded On using the scan tool, the seat function may not work using the seat adjuster switch until you back out of the scan tool Control Functions menu.

  7. Verify the test lamp illuminates when commanding the seat motor in the Up/Down or Forward/Rearward states with a scan tool.
    • If the test lamp does not illuminate during either of the commands 
    1. Ignition OFF, disconnect the X4 harness connector at the K40 Seat Memory Control Module.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in each control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K40 Seat Memory Control Module.
    • If the test lamp illuminates during each of the commands 
  8. Test or replace the seat motor.
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