Hyundai Elantra: Controller / Heater & A/C Control Unit (Manual) Repair procedures

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the glove box upper cover assembly.
(Refer to Body - "Glove Box Upper Cover Assembly")
3.
Loosen the mounting screws and remove the crash pad center lower cover [LH](A).

4.
After loosening the mounting screws, remove the A/C & heater controller unit (A).

5.
Disconnect the A/C & heater controller connectors (A) and hose (B).

6.
To intall, reverse the removal procedure.
   
Make sure the connector are connected in properly.
Replace any damaged clips (or pin-type retainers).
Heater & A/C Control Unit (Manual) Components and Components Location
Components ConnectorPin NOFunctionConnectorPin NOFunctionA1LowB18ILL- (RHEO)2Common19Sensor ground3Ground20Ground4Middle Low21Battery (+)5Middle High22ISG DC6High23ISG B+B1IGN224ILL+ (TAIL)2PAB I ...

Heater & A/C Control Unit (DATC) Components and Components Location
Components ConnectorPin NOFunctionConnectorPin NOFunctionA1Battery (+)A21IGN12IGN222ILL+ (TAIL)3ISG B+23Sensor ground REF (+5V)4Mode control actuator (Vent)24C_CAN High5Mode control actuator (Def ...

Other information:

Hyundai Elantra AD (2016-2020) Service Manual: Seat Heater Schematic Diagrams
Circuit Diagram [Front Seat Heater (Non-Air Ventilation)] [Rear Seat Heater (Bench Type)] ...

Hyundai Elantra AD (2016-2020) Service Manual: Troubleshooting
Troubleshooting Ignition System SymptomSuspect AreaRemedyEngine will not start or is hard to start (Cranks OK)Ignition lock switchInspect ignition lock switch, or replace as requiredIgnition coilInspect ignition coil, or replace as requiredSpark plugsInspect spark plugs, or replace as requir ...

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