Circuit/System Testing

Ignition OFF, disconnect the harness connector at the appropriate driver seat motor listed below for which the DTC set:
- M50D Seat Front Vertical Motor
- M55D Seat Rear Vertical Motor
- M51D Seat Horizontal Motor
- M56D Seat Back Recline Motor
Ignition ON.
Test for greater than 10.8V between the 12V reference circuit terminal 4 and ground.
- If 10.8V or less
1. Ignition OFF, disconnect the X1 harness connector at the K40 Seat Memory Control Module.
2. Test for infinite resistance between the 12V 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 2Ω in the 12V reference 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 greater than 10.8V
Test for 0.3-2V between the signal circuit terminal 2 and ground.
- If 0.3V or less
1. Ignition OFF, disconnect the X1 harness connector at the K40 Seat Memory Control Module.
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 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 greater than 2V
1. Ignition OFF, disconnect the X1 harness connector at the K40 Seat Memory Control Module, ignition ON.
2. Test for less than 1V between the signal circuit and ground.
  - If 1V or greater, repair the short to voltage on the circuit.
  - If less than 1V, replace the K40 Seat Memory Control Module.
- If between 0.3-2V
Test or replace the seat motor.