Lucerne V8-4.6L (2008)
Heated and Cooled Seat Switch Test
1. Ignition OFF, disconnect the harness connector at the appropriate heated and cooled seat switch.
2. Verify that a test lamp illuminates between the appropriate low reference circuit listed below and B+.
*
Driver heated and cooled seat switch terminal 3
*
Passenger heated and cooled seat switch terminal 5
‹› If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the door
module.
3. Ignition ON, verify the appropriate scan tool driver or passenger door switch parameters listed below are Inactive or Off.
*
Seat Back Heat Mode Sw.
*
Seat Cool Mode Switch
*
Seat Heat Mode Sw.
‹› If not the specified value, test the appropriate signal circuit listed below for a short to ground. If the circuit tests normal, replace the door
module.
*
Driver seat back only heat mode switch terminal 11
*
Driver seat cool switch terminal 14
*
Driver seat back and cushion switch terminal 8
*
Passenger seat back only heat mode switch terminal 11
*
Passenger seat cool switch terminal 8
*
Passenger seat back and cushion switch terminal 14
4. Install a 3A fused jumper wire between the signal circuit terminal 11 and ground. Verify the scan tool Seat Back Heat Mode Sw. parameter is
Active.
‹› If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the door
module.
5. Install a 3A fused jumper wire between the appropriate signal circuit listed below and ground. Verify the scan tool Seat Cool Mode Switch
parameter is On.
*
Driver seat cool switch signal terminal 14
*
Passenger seat cool switch signal terminal 8
‹› If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the door
module.
6. Install a 3A fused jumper wire between the appropriate signal circuit listed below and ground. Verify the scan tool Seat Heat Mode Sw. parameter
is Active.
*
Driver seat back and cushion switch signal terminal 8
*
Passenger seat back and cushion switch signal terminal 14
‹› If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the door
module.
7. If all circuits test normal, test or replace the heated and cooled seat switch.
Heated and Cooled Seat Malfunction
1. Ignition OFF, disconnect the X3 harness connector at the CCSM.
2. Connect a test lamp between the appropriate signal circuit listed below and B+.
*
Driver heated/cooled seat mode signal terminal 14
*
Passenger heated/cooled seat mode signal terminal 6
3. Ignition ON, press the HEAT or COOL switch through the high, medium, and low positions to OFF. The test lamp should illuminate until the OFF
position is reached.
‹› If the test lamp does not illuminate, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the MSM.
‹› If the test lamp is ON with the switch in the OFF position, test the signal circuit for a short to ground. If the circuit tests normal, replace the
