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Circuit/System Testing: Notes

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B2345 00

  1. Ignition OFF, disconnect the X1, X4 harness connectors at the MSM.
  2. Test for infinite resistance between the driver seat heating element supply voltage circuit terminal 14 X1 and ground.
    • If less than the specified range, 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 X1 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 passenger seat heating element supply voltage circuit terminal 6 X1 and ground.
    • If less than the specified range, 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 X1 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. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
  2. Test for greater than 850 ohms between the following seat cushion temperature sensor signal circuits and the low reference circuits:
    • Driver seat cushion terminal 1 X5 and terminal 3 X2
    • Passenger seat cushion terminal 2 X5 and terminal 6 X2
    • If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the affected seat cushion heater element.
  3. Test for greater than 850 ohms between the following seat back temperature sensor signal circuits and the low reference circuits:
    • Driver seat back terminal 4 X5 and terminal 2 X2
    • Passenger seat back terminal 3 X5 and terminal 5 X2
    • If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the affected seat back heater element.
  4. If the circuits test normal replace the MSM.
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