Reference Information
Schematic Reference
Heated/Cooled Seat Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Verify the type of vehicle and the heated seat system for which the DTC set.
If the DTC set in a hybrid or a non-hybrid vehicle without memory, refer to Circuit/System Testing below.
If the DTC set in a vehicle equipped with memory, refer to DTC B2435 or B2440 (w/o HP2 with memory).
Circuit/System Testing
B2435 02 or B2435 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 19 X4 and the low reference circuit terminal 5 X2.
锟斤拷 If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
锟斤拷 If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
HSM.
锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
6. If all circuits test normal, replace the HSM.
B2440 02 or B2440 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 10 X4 and the low reference circuit terminal 7 X2.
锟斤拷 If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
锟斤拷 If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
