Hyundai Tucson: Controller / Heater & A/C Control Unit (Manual)
Connector Pin Function
| Pin No | Connector A (Blower) | Connector B (Main) |
| 1 | Low | Battery (+) |
| 2 | Common | ISG B+ |
| 3 | Ground | ILL+ (TAIL) |
| 4 | Middle Low | Sensor REF (+5V) |
| 5 | Middle High | Mode control actuator feedback |
| 6 | High | Temperature control actuator feedback |
| 7 | Intake actuator feedback | |
| 8 | Evaporator temperautre sensor (+) | |
| 9 | Ambient temperature sensor (+) | |
| 10 | Mode control actuator (Vent) | |
| 11 | Mode control actuator (DEF) | |
| 12 | Temperature control actuator (Cool) | |
| 13 | Temperature control actuator (Warm) | |
| 14 | Intake actuator (FRE) | |
| 15 | Intake actuator (REC) | |
| 16 | - | |
| 17 | - | |
| 18 | - | |
| 19 | Blower ON signal (Common) | |
| 20 | ILL - (RHEO) | |
| 21 | IGN2 | |
| 22 | IGN1 | |
| 23 | Blower INH | |
| 24 | Blower IS | |
| 25 | Blower PWM IN | |
| 26 | - | |
| 27 | Blower MAX signal | |
| 28 | IBU Active Low | |
| 29 | PTC realy 2 | |
| 30 | PTC ON signal | |
| 31 | - | |
| 32 | - | |
| 33 | CAN FD (High) | |
| 34 | CAN FD (Low) | |
| 35 | - | |
| 36 | Blower relay | |
| 37 | ECV (+) | |
| 38 | ECV (-) | |
| 39 | Sensor ground | |
| 40 | Ground |
1.Disconnect the negative (-) battery terminal.
2.Remove the front monitor.(Refer to Body Electrical System - "Front Monitor")
3.Remove the heater & A/C control unit (A).
4.Install in the reverse order of removal.
• Replace any damaged clips.
• Make sure the connector is connected properly.
Controller
...
Heater & A/C Control Unit (DATC)
- Components
Connector Pin Function
Pin NoConnector A
1Battery (+)
2IGN2
3IGN1
4Local CAN (High)
5Local CAN (Low)
6In-car sensor (+)
7-
8Sensor ground
9ISG B+
10ILL+ (TAIL)
11-
12- ...
Other information:
Hyundai Tucson (NX4) 2022-2026 Service Manual: Troubleshooting
- Trouble Symptom Charts
Trouble Symptom 1
Trouble Symptom 2
Trouble symptomProbable causeRemedy
The set vehicle speed varies greatly upward or downward"Surging" (repeated alternating acceleration and deceleration) occurs after settingMalfunction of the vehicle speed sensor circuitRepair ...
Hyundai Tucson (NX4) 2022-2026 Owner's Manual: Seat Belt Restraint System
WARNING
Improperly positioned seat belts may
increase the risk of serious injury in an
accident. Take the following precautions
when adjusting the seat belt:
Position the lap portion of the seat
belt as low as possible across your
hips, not on your waist, so that it
fits snugly ...
