The front seat heater control unit does not turn on the front seat heater until the seat core temperature is 185 °F (85 °C) or less. Make sure the seat core temperature is below 185 °F (85 °C) before troubleshooting.
DTC Description
DTC
B1C63 Passenger's Heater Current Abnormal Low
1.
Problem verification:
Problem verification
?1.
Clear the DTCs with the HDS.
?2.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
?3.
Check for DTCs with the HDS.
DTC Description
DTC
B1C63 Passenger's Heater Current Abnormal Low
Is DTC B1C63 indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
DTC check:
DTC check
?1.
Turn the vehicle to the OFF (LOCK) mode.
?2.
Disconnect the following connector.
Front passenger's seat cushion heater 4P connector
?3.
Connect terminals A and B with a jumper wire.
Terminal A
Front passenger's seat cushion heater 4P connector No. 1
Terminal B
Body ground
?4.
Turn the vehicle to the ON mode.
?5.
Clear the DTCs with the HDS.
?6.
Check for DTCs with the HDS.
DTC Description
DTC
B1C63 Passenger's Heater Current Abnormal Low
Is DTC B1C63 indicated?
YES
Repair an open or high resistance in the +B HEATER(AS) wire.?
NO
Go to step 3.
3.
Seat heater check:
Seat heater check
?1.
Disconnect the following connector.
Front passenger's seat-back heater 2P connector
?2.
Measure the resistance between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode Front passenger's seat cushion heater 4P connector: disconnected Front passenger's seat-back heater 2P connector: disconnected
Test point 1
Front passenger's seat cushion heater 4P connector No. 1
Test point 2
Front passenger's seat cushion heater 4P connector No. 2
