Circuit/System Testing

Seat Adjuster Switch Circuit Test

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate S64 Seat Adjuster Switch. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10Ω between the ground circuit terminal B 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. 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.
      • If infinite resistance
   3. 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 not open and there is voltage at the circuit breaker.
   • If the test lamp illuminates 
5. Test or replace the S64 Seat Adjuster Switch.

Seat Motor Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below:
   • M50 Front Vertical Motor
   • M55 Rear Vertical Motor
   • M51 Horizontal Motor
   • M56 Recline Motor
2. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5, ignition ON.
3. Verify the test lamp illuminates when commanding the seat motor Up and Down or Forward and Rearward using the S64 Seat Adjuster Switch.
   • If the test lamp does not illuminate 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.
      • 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, test or replace the S64 Seat Adjuster Switch
   • If the test lamp illuminates during each of the commands 
4. Test or replace the seat motor.