Circuit/System Testing

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 10 Ω between the ground circuit terminal E and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
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 up switch terminal A
      • Front vertical down switch terminal K
      • Rear vertical up switch terminal F
      • Rear vertical down 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 3 A fused jumper wire between the appropriate signal circuit terminal listed below and the ground circuit terminal E.
   • Front vertical up switch terminal A
   • Front vertical down switch terminal K
   • Rear vertical up switch terminal F
   • Rear vertical down 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 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 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 and all vehicle systems OFF, disconnect the X4 harness connector at the K40 seat memory control module. It mat take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 6 and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ground circuit end to end.
   • If 2 Ω or greater, repair the open/high resistance in the circuit.
   • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
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 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
   • 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:
   • M50D Seat Front Vertical Motor
   • M55D Seat Rear Vertical Motor
   • M51D Seat Horizontal Motor
   • M56D Seat Back Recline Motor
6. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5.
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 turns ON when commanding the seat motor in the Up/Down or Forward/Rearward states with a scan tool.
   • If the test lamp remains OFF 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 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 the test lamp turns ON during each of the commands 
8. Test or replace the seat motor.