Circuit/System Testing: Notes

B2345 00

1. Ignition OFF, disconnect the MSM connectors X1 and X4.
2. Test for infinite resistance between the left seat heating element supply voltage circuit terminal 14 and ground.
   • If less than infinite, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
3. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 14 and ground.
   • If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
4. Test for infinite resistance between the right seat heating element supply voltage circuit terminal 6 and ground.
   • If less than infinite, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
5. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 and ground.
   • If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
6. If all circuits test normal, replace the MSM.

B2345 13

1. Disconnect the MSM connectors X2 and X5.
2. Verify the resistance through the faulted seat heat sensor is 850-300K ohms from the signal circuit terminal to the low reference circuit terminal in the harness connectors.
   • If less than 850 ohms, replace the seat heater element.
3. If the circuits test normal replace the MSM.