Hyundai Santa Cruz: Controller / Heater Control Unit
1. Heater control unit
| Pin No | Connector A | Connector B |
| 1 | Mode control actuator feedback | Ground |
| 2 | Intake actuator feedback | Sensor ground |
| 3 | Passenger's temperature control actuator feedback | ECV (-) |
| 4 | Driver's temperature control actuator feedback | ECV (+) |
| 5 | Auto defogging actuator feedback | - |
| 6 | - | - |
| 7 | - | - |
| 8 | Photo sensor (-) LEFT | Blower INH |
| 9 | Photo sensor (-) RIGHT | Blower IS |
| 10 | - | Blower PWM IN |
| 11 | Auto defogging actuator SDA | - |
| 12 | Auto defogging actuator SCL | - |
| 13 | Auto defogging actuator TEMP | Sensor (+ 5V) |
| 14 | Ambient temperature sensor (+) | - |
| 15 | Evaporator sensor (+) | - |
| 16 | - | Battery (+) |
| 17 | - | Ground |
| 18 | - | - |
| 19 | - | - |
| 20 | - | - |
| 21 | Mode control actuator (Vent) | - |
| 22 | Mode control actuator (DEF) | - |
| 23 | Intake actuator (FRE) | - |
| 24 | Intake actuator (REC) | - |
| 25 | Passenger's temperature control actuator (Cool) | Blower operation signal |
| 26 | Passenger's temperature control actuator (Warm) | - |
| 27 | Driver's temperature control actuator (Cool) | PTC Relay |
| 28 | Driver's temperature control actuator (Warm) | - |
| 29 | Auto defogging actuator (Open) | Blower relay |
| 30 | Auto defogging actuator (Close) | LIN BUS (Climate control) |
| 31 | - | IGN1 |
| 32 | - | IGN2 |
| 33 | - | |
| 34 | E_CAN (Low) | |
| 35 | E_CAN (High) | |
| 36 | - | |
| 37 | - | |
| 38 | - | |
| 39 | - | |
| 40 | Ground |
1.Disconnect the battery (-) terminal.
2.Remove the glove box.(Refer to Body (Interior and Exterior) - "Glove Box")
3.Press the lock pin (B) and then remove the crash pad under cover (A).
4.Disconnect the blower motor connector (A).
5.Remove the heater control unit (A), after removing the screws.
6.Disconnect the heater control unit connector.
7.Install in the reverse order of removal.
• Make sure the connector is connected properly.
Heater & A/C Control Unit (DATC)
- Terminal Function
Connector Pin Function
Pin NoConnector A
1Battery (+)
2-
3-
4LIN BUS (Climate control)
5-
6-
7-
8-
9IGN2
10ISG B+
11IGN1
12-
13Incar sensor (+)
14-
15Sensor G ...
Other information:
Hyundai Santa Cruz 2021-2025 Owners Manual: Immobilizer System
The immobilizer system helps protect
your vehicle from theft. If an improperly
coded key (or other device) is used, the
engine’s fuel system is disabled.
When the ignition switch is turned on (or
the Engine Start/Stop button is pressed
to the on position), the immobilizer
system indicator sh ...
Hyundai Santa Cruz (NX4A OB) 2021-2025 Service Manual: Description and Operation
- Description
Body Control Module Controls The Followings
– Wiper & Washer Control
– Defroster Control
– Driving Control
– Tailgate Control
– Window Control
– Interior Control
– Exterior Control
– Panic alarm Control
– MTS
– Flasher output Cont ...
