Lucerne V8-4.6L (2008)
Heated and Cooled Seat Switch Indicators Always On
1. Ignition OFF, disconnect the harness connector at the appropriate driver or passenger heated and cooled seat switch.
2. Ignition ON, test for 0 volts between the appropriate indicator control circuit listed below and ground.
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Driver heated seat back only mode indicator terminal 4
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Driver heated seat cool mode indicator terminal 7
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Driver heated seat back and cushion indicator terminal 2
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Driver low temperature indicator terminal 13
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Driver medium temperature indicator terminal 6
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Driver high temperature indicator terminal 12
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Passenger heated seat back only mode indicator terminal 4
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Passenger heated seat cool mode indicator terminal 1
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Passenger heated seat back and cushion indicator terminal 6
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Passenger low temperature indicator terminal 9
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Passenger medium temperature indicator terminal 2
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Passenger high temperature indicator terminal 10
‹› If greater than the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the appropriate DDM or
FPDM.
Component Testing
Driver Heated and Cool Seat Switch
1. Ignition OFF, disconnect the harness connector at the heated and cooled seat switch.
2. Test for infinite resistance between the signal circuits listed below and the low reference circuit terminal 3 with the switch in the open position.
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Heated seat back only mode switch signal terminal 11
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Heated seat back and cushion switch signal terminal 8
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Heated seat cool switch signal terminal 14
‹› If not the specified value, replace the heated and cooled seat switch.
3. Test for less than 2 ohms between the signal circuits listed below and the low reference circuit terminal 3 with the switch in the closed position.
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Heated seat back only mode switch signal terminal 11
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Heated seat back and cushion switch signal terminal 8
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Heated seat cool switch signal terminal 14
‹› If greater than the specified range, replace the heated and cooled seat switch.
Passenger Heated and Cool Seat Switch
1. Ignition OFF, disconnect the harness connector at the heated seat switch.
2. Test for infinite resistance between the signal circuits listed below and the low reference circuit terminal 5 with the switch in the open position.
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Heated seat back only mode switch signal terminal 11
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Heated seat back and cushion switch signal terminal 14
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Heated seat cool switch signal terminal 8
‹› If not the specified value, replace the heated and cooled seat switch.
3. Test for less than 2 ohms between the signal circuits listed below and the low reference circuit terminal 5 with the switch in the closed position.
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Heated seat back only mode switch signal terminal 11
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Heated seat back and cushion switch signal terminal 14
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Heated seat cool switch signal terminal 8
‹› If greater than the specified value, replace the heated and cooled seat switch.
Ventilation Heat and Cool Module
1. Ignition OFF, disconnect the harness connectors at the seat cushion and seat back ventilation heat and cool modules.
Important: If the resistance is measured with the seat still warm or cool, the resistance values will vary. At 68°F (20°C), the nominal
resistance value is 1200 ohms ±5 percent. For warmer or cooler ambient temperatures, Refer to the Temperature vs Resistance table
below. The delta resistance values between the seat cushion and seat back temperature sensors should not be greater than 2000 ohms.
