Front Seat Heater Control Unit Connector for Inputs and Outputs

WARNING: This page is about a different car, the 2022 Honda Accord, 2021 Honda Accord, 2020 Honda Accord, 2019 Honda Accord, and 2018 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.

Front Seat Heater Control Unit 24P Connector (female terminals)

Courtesy of HONDA, U.S.A., INC.

Terminal number	Terminal name	Description	Signal
1	HEATER DR	Drives driver's seat heater	With driver's seat heater operation: pulse (depending on driver's seat temperature) If none of above conditions are met: less than 0.2 V
2	DR H/SEAT LO RLY COM	Power source for front seat heater control unit	With vehicle in ON mode: about battery voltage
3	HEATER AS	Drives front passenger's seat heater	With front passenger's seat heater operation: pulse (depending on front passenger's seat temperature) If none of above conditions are met: less than 0.2 V
4	GND	Ground for front seat heater control unit	Less than 0.2 V at all times
5	Not used	---	---
6	Not used	---	---
7	Not used	---	---
8	Not used	---	---
9	B-CAN_L	Communication line	---
10	B-CAN_H	Communication line	---
11	Not used	---	---
12	TH+ DR	Detects driver's seat heater thermistor signal	With vehicle in ON mode: about 0.4-4.9 V (depending on driver's seat temperature)
13	TH+ AS	Detects front passenger's seat heater thermistor signal	With vehicle in ON mode: about 0.4-4.9 V (depending on front passenger's seat temperature)
14	IG1 OPTION	IG1 power source	With vehicle in ON or START mode: about battery voltage
15*	IND STATE	Outputs indicator dimming signal	---
16	Not used	---	---
17	Not used	---	---
18	Not used	---	---
19	Not used	---	---
20	Not used	---	---
21	Not used	---	---
22	TH- DR	Ground for driver's seat heater thermistor signal	Less than 0.2 V at all times
23	TH- AS	Ground for front passenger's seat heater thermistor signal	Less than 0.2 V at all times
24	Not used	---	---

*: With rear seat heater