Component Testing

Lumbar Support Switch

1. Ignition OFF, disconnect the X1 and X2 harness connector at the S64 Seat Adjuster Switch.
2. Test for infinite resistance between the ground terminal 6 X1 and each lumbar signal terminal with the switch in the open position.
   • If less than infinite resistance 

     Replace the S64 Seat Adjuster Switch.

   • If infinite resistance 
3. Test for less than 2 Ω between the ground terminal 6 X1 and each lumbar signal terminal with the appropriate switch in the closed position.
   • If 2 Ω or greater 

     Replace the S64 Seat Adjuster Switch.

   • If less than 2 Ω 
4. All OK.

Lumbar Support Motor

1. Ignition OFF, disconnect the harness connector at the appropriate M53D Seat Lumbar Support Motor.
NOTE:

When performing the following tests, make sure that the lumbar support is not already in the position the test is attempting to produce.

2. Install a 30 A fused jumper wire between control terminal A and 12 V.
3. Momentarily install a jumper wire between control terminal B and ground. The lumbar motor should momentarily perform the appropriate FORWARD/REARWARD function.
   • If the motor does not perform the FORWARD/REARWARD function 

     Replace the M53D Seat Lumbar Support Motor.

   • If the motor performs the FORWARD/REARWARD function 
4. Reverse the jumper wires; the lumbar motor should perform the FORWARD/REARWARD function.
   • If the motor does not perform the FORWARD/REARWARD function 

     Replace the M53D Seat Lumbar Support Motor.

   • If the motor performs the FORWARD/REARWARD function 
5. All OK.