Component Testing

Seat Lumbar Support Switch

1. Ignition OFF, disconnect the harness connector at the appropriate S65 Seat Lumbar Support Switch.
2. Test for infinite resistance between the B+ terminal G and each control terminal with the switch in the open position.
   • If less than infinite resistance 

     Replace the S65 Seat Lumbar Support Switch.

   • Go to next step: If infinite resistance 
3. Test for less than 2 Ω between the B+ terminal G and each control terminal with the appropriate switch in the closed position.
   • If 2 Ω or greater 

     Replace the S65 Seat Lumbar Support Switch.

   • Go to next step: If less than 2 Ω 
4. Test for less than 2 Ω between the ground terminal E and each control terminal with the switch in the open position.
   • If 2 Ω or greater 

     Replace the S65 Seat Lumbar Support Switch.

   • Go to next step: If less than 2 Ω 
5. All OK.

M53 Seat Lumbar Support Motor

1. Ignition OFF, disconnect the harness connector at the M53 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 1 and 12 V.
3. Momentarily install a jumper wire between control terminal 2 and ground. The M53 Seat Lumbar Support Motor should momentarily perform the lumbar FORWARD function.
   • If the motor does not perform the lumbar FORWARD function 

     Replace the M53 Seat Lumbar Support Motor.

   • Go to next step: If the motor performs the lumbar FORWARD function 
4. Reverse the polarity of jumper wires; the lumbar motor should perform REARWARD function.
   • If the motor does not perform the lumbar REARWARD function 

     Replace the M53 Seat Lumbar Support Motor.

   • Go to next step: If the motor performs the lumbar REARWARD function 
5. All OK.