LaCrosse FWD V6-3.0L (2010)
Description and Operation
Heated/Vented Seat Description and Operation (See: Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing For Intermittent Conditions and Poor Connections)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Driver Seat Heating/Venting/Cooling Mode parameter while pressing the driver VENTED seat switch. The
reading should change between Off and Vent/Cool.
‹› If not the specified value, replace the A20 radio/HVAC controls.
2. Observe the scan tool Passenger Front Seat Heating/Venting/Cooling Mode parameter while pressing the front passenger VENTED seat switch.
The reading should change between Off and Vent/Cool.
‹› If not the specified value, replace the A20 radio/HVAC controls.
3. If all scan tool parameter readings test normal and the driver and/or passenger vented seat is inoperative, refer to the Circuit/System Testing.
Circuit/System Testing
Ignition ON, verify that a test lamp illuminates between the test points on the 10 A DSM fuse and ground.
If the test lamp does not illuminate, refer to the Ignition Main Relay Circuit Test.
If the test lamp illuminates, refer to the Blower Motor Circuit Test.
Ignition Main Relay Circuit Test
1. Ignition OFF, disconnect the KR73 ignition main relay.
2. Test for less than 5 Ohms between the ground circuit terminal 86 and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
‹› If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 85 and ground.
‹› If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K9 BCM.
5. If all circuits test normal, test or replace the KR73 ignition main relay.
Blower Motor Circuit Test
1. Ignition OFF, disconnect the harness connector at the appropriate blower motor listed below:
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M73A seat blower motor - driver back
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M73C seat blower motor - driver cushion
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M73B seat blower motor - passenger back
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M73D seat blower motor - passenger cushion
2. Test for less than 5 Ohms between the ground circuit terminal B and ground.
‹› If greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
