LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2021 >> Clarity Plug-In Hybrid >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Service, Test & Troubleshooting (Plug-In) >> Connector View >> Climate Control Unit Connector For Inputs And Outputs
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Climate Control Unit Connector For Inputs And Outputs

Connector Index
Climate Control Unit Connector A (32P)
Climate Control Unit Connector B (24P)

Climate Control Unit Connector A (32P) (female terminals) 

GHH419089Courtesy of HONDA, U.S.A., INC.
Climate Control Unit Connector A (32P) (female terminals)

Cavity Terminal name Description Signal
1 EWP PWM Electric heater coolant pump communication signal With vehicle in ON mode: pulses
2 Not used --- ---
3 RR DEF RLY CL- Signal for rear window defogger/mirror defogger relay With vehicle in ON mode and rear window defogger/mirror defogger button ON: less than 0.2 VWith vehicle in ON mode and rear window defogger/mirror defogger button OFF: battery voltage
4 HUM DATA Humidity/in-car temperature sensor communication signal With vehicle in ON mode: pulses
5 Not used --- ---
6 Not used --- ---
7 Not used --- ---
8 F-CAN A_H F-CAN communication signal With vehicle in ON mode: pulses
9 Not used --- ---
10 Not used --- ---
11 B-CAN_L B-CAN communication signal With vehicle in ON mode: pulses
12 SENSOR COM Sensor ground With vehicle in ON mode: less than 0.2 V
13 Not used --- ---
14 A/C MAIN RLY Signal for A/C main relay With A/C main relay ON: battery voltage
15 IG1 METER IG1 power source With vehicle in ON mode: battery voltage
16 +B A/C MAIN/DRL +B power source With vehicle in ON mode: battery voltage
17 Not used --- ---
18 Not used --- ---
19 Not used --- ---
20 SOL WV Signal for electric water valve With vehicle in ON mode: pulses
21 HUM CLK Humidity/in-car temperature sensor communication signal With vehicle in ON mode: pulses
22 Not used --- ---
23 ACMAIN SIG Signal for battery condition monitor module With vehicle in ON mode: pulses
24 F-ACN A_L F-CAN communication signal With vehicle in ON mode: pulses
25 Not used --- ---
26 TAM Detects outside air temperature sensor A signal With vehicle in ON mode: about 1.0-4.0 V (depending on outside air temperature)
27 AC LIN Communication to climate control panel ---
28 B-CAN_H B-CAN_H communication signal With vehicle in ON mode: pulses
29 GND Ground for climate control unit (G302) With vehicle in ON mode: less than 0.2 V
30 S 5V Outputs sensor 5 V With vehicle in ON mode: about 5.0 V
31 Not used --- ---
32 Not used --- ---

Climate Control Unit Connector B (24P) (female terminals) 

GHH419090Courtesy of HONDA, U.S.A., INC.
Climate Control Unit Connector B (24P) (female terminals)

Cavity Terminal name Description Signal
1 Not used --- ---
2 Not used --- ---
3 TAM B Detects outside air temperature sensor B signal With vehicle in ON mode: about 1.0-4.0 V (depending on outside air temperature)
4 TEVA Detects evaporator temperature sensor signal With vehicle in ON mode: about 1.0-4.0 V (depending on evaporator temperature)
5 HIN-TW Detects heater core temperature sensor signal With vehicle in ON mode: about 1.0-4.0 V (depending on heater core temperature)
6 AMD-P DR Detects potentiometer signal of driver's air mix control motor With vehicle in ON mode: about 0.5-4.5 V (depending on driver's air mix control motor position)
7 AMD-P AS Detects potentiometer signal of passenger's air mix control motor With vehicle in ON mode: about 0.5-4.5 V (depending on passenger's air mix control motor position)
8 RFD-P Detects potentiometer signal of recirculation control motor With vehicle in ON mode: about 0.5-4.1 V (depending on recirculation control motor position)
9 MDD-P Detects potentiometer signal of mode control motor With vehicle in ON mode: about 0.5-4.5 V (depending on mode control motor position)
10 SENS COM H Sensor ground With vehicle in ON mode: less than 0.2 V
11 BLW-G Outputs power transistor gate voltage With vehicle in ON mode and fan control button OFF: less than 0.2 VWith vehicle in ON mode and fan control button ON: about 4.0 V-battery voltage (depending on blower motor control)
12 BLW-V Feedback signal of power transistor drain voltage With vehicle in ON mode: about 0 V-battery voltage (depending on blower motor speed)
13 Not used --- ---
14 S5V H Outputs sensor 5 V With vehicle in ON mode: about 5.0 V
15 Not used --- ---
16 Not used --- ---
17 M-HOT AS Output to drive passenger's air mix control motor to HOT side With vehicle in ON mode and passenger's air mix control motor moving to HOT: battery voltage
18 M-COOL AS Output to drive passenger's air mix control motor to COOL side With vehicle in ON mode and passenger's air mix control motor moving to COOL: battery voltage
19 M-HOT DR Output to drive driver's air mix control motor to HOT side With vehicle in ON mode and driver's air mix control motor moving to HOT: battery voltage
20 M-COOL DR Output to drive driver's air mix control motor to COOL side With vehicle in ON mode and driver's air mix control motor moving to COOL: battery voltage
21 M-DEF Outputs to drive mode control motor to DEF side With vehicle in ON mode and mode control motor moving to DEF: battery voltage
22 M-VENT Outputs to drive mode control motor to VENT side With vehicle in ON mode and mode control motor moving to VENT: battery voltage
23 M-FRS Output to drive recirculation control motor to FRESH side With vehicle in ON mode and recirculation control motor moving to FRESH: battery voltage
24 M-REC Output to drive recirculation control motor to RECIRCULATE side With vehicle in ON mode and recirculation control motor moving to RECIRCULATE: battery voltage