Circuit/System Testing

Seat Adjuster Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate S64 Seat Adjuster Switch.
2. Test for less than 10 Ω between the ground circuit terminal B 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.
   • Go to next step: If less than 10 Ω 
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal E and ground.
   • If the test lamp does not illuminate 
   1. Ignition OFF
   2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   3. 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 circuit breaker is not open and there is voltage at the circuit breaker.
   • Go to next step: If the test lamp illuminates 
5. Test or replace the S64 Seat Adjuster Switch.

Seat Vertical or Recline Motor Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below:
   • M50 Seat Front Vertical Motor
   • M55 Seat Rear Vertical Motor
   • M56 Seat Recline Motor
2. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5, ignition ON.
3. Verify the test lamp turns ON when commanding the seat motor Up and Down or Forward and Rearward using the seat adjuster switch.
   • If the test lamp does not turn ON during either of the commands 
   1. Ignition OFF, disconnect the harness connector at the S64 Seat Adjuster Switch.
   2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: 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, test or replace the S64 Seat Adjuster Switch.
   • Go to next step: If the test lamp turns ON during each of the commands 
4. Test or replace the seat motor.

Seat Horizontal Motor

1. Ignition ON.
2. Verify the appropriate scan tool Folding Top Control Module seat switch parameter listed below changes between Inactive and Active when pressing the seat horizontal switch.
   • S64D Seat Adjuster Switch - Driver (Horizontal Control)
   • S64P Seat Adjuster Switch - Passenger (Horizontal Control)
   • If the parameter does not change 

     Refer to DTC B3728 or B3737  Circuit/System Testing.

   • Go to next step: If the parameter changes 
3. Refer to DTC B175A, B1770, B2015, or B3942  Circuit/System Testing.