DTC Troubleshooting: B1C56

DTC B1C56: Driver's Heater Thermistor Circuit Short

NOTE:

	If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
	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
B1C56 Driver's Heater Thermistor Circuit Short

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.	Wait for at least 90 seconds.

?4.

Check for DTCs with the HDS.

DTC Description	DTC
B1C56 Driver's Heater Thermistor Circuit Short

Is DTC B1C56 indicated?

Go to step 2.

Intermittent failure, the system is OK at this time. Check for loose or poor connections.?

DTC check:

DTC check

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Disconnect the following connector.

Driver's seat cushion heater 4P connector

?3.	Turn the vehicle to the ON mode.

?4.	Clear the DTCs with the HDS.

?5.

Check for DTCs with the HDS.

DTC Description	DTC
B1C56 Driver's Heater Thermistor Circuit Short

Is DTC B1C56 indicated?

Repair a short in the +THERMISTER(DR) wire.?

Repair a short in the DR TH+ wire.?

Faulty driver's seat heater thermistor; replace the driver's seat cushion heater.?