Climate Control Module: what it does and what each make calls it

What does this module do?

The climate module manages cabin temperature, air distribution flaps and compressor demand. Flap motors report position feedback, so mechanical binding is a common fault source here.

What do the makes call this module?

The name of a module doing the same job changes from make to make. The names below are the actual definition names used under this type in the CarCoding scan map (68 distinct names):

Module name	Address
A/C / Climate	`7C7`
A/C / HVAC (29-bit)	`18DA98E0`
A/C Amplifier (HVAC)	`7C4`
A/C Compressor	`18DA99F1`
A/C Compressor	`719`
A/C Compressor	`719`
A/C compressor stub (MEB/EVO)	`17FC165D`
A/C compressor stub (MEB/EVO)	`17FC165D`
A/C), climate), heater #3	`688`
A/C, Heater #2	`7C6`
A/C, Heater), Climate	`7C4`
AC Compressor	`17FC0019`
AC Compressor	`17FC0019`
ACC (A/C compressor 2)	`7BB`
ACC (A/C compressor)	`7B3`
ACCM	`7C7`
ACCP	`7C6`
ACM	`727`
ACM	`7D1`
ACM/PAL	`737`
ATC (Climate)	`750`
Additional Heater	`711`
Air Conditioning	`1C400046`
Air Conditioning	`1C400046`
Air Conditioning	`7E7`
Air Conditioning	`7E7`
Air Conditioning 2	`18DA98F1`
Auto HVAC	`746`
Auto HVAC	`746`
Aux Heater / PTC	`731`
Auxiliary Air Heater	`17FC00A4`
Auxiliary Air Heater	`17FC00A4`
Auxiliary Blower Motor Control 1	`17FC16E5`
Auxiliary Blower Motor Control 1	`17FC16E5`
Auxiliary Blower Motor Control 2	`17FC16E6`
Auxiliary Blower Motor Control 2	`17FC16E6`
Auxiliary Parking Heater	`76A`
Auxiliary Parking Heater	`76A`
Auxiliary heater (11 bit)	`7D9`
CTPA	`737`
Catalyst Heating	`17FC1744`
Catalyst Heating	`17FC1744`
Climate Control	`744`
Climate HMI / Display	`736`
Control Module For Auxiliary Air Heater	`17FC1629`
Control Module For Auxiliary Air Heater	`17FC1629`
Control Module For Auxiliary Air Heater 2	`17FC1757`
Control Module For Auxiliary Air Heater 2	`17FC1757`
Control Module For Auxiliary Blower Motors	`17FC169C`
Control Module For Auxiliary Blower Motors	`17FC169C`
Control Unit Heating 1	`17FC172B`
Control Unit Heating 1	`17FC172B`
Control Unit Heating 2	`17FC172C`
Control Unit Heating 2	`17FC172C`
Control Unit Heating 3	`17FC172D`
Control Unit Heating 3	`17FC172D`
Control Unit Heating 4	`17FC172E`
Control Unit Heating 4	`17FC172E`
Cup Holder With Heater And Cooling Element	`17FC168C`
Cup Holder With Heater And Cooling Element	`17FC168C`
Electric A/C Compressor	`76B`
Fresh Air Blower Back	`17FC161C`
Fresh Air Blower Back	`17FC161C`
Fresh air blower control - front (MEB/EVO)	`17FC161B`
Fresh air blower control - front (MEB/EVO)	`17FC161B`
HVAC	`733`
HVAC	`733`
HVAC	`74B`
HVAC	`7E3`
HVAC (2019-)	`607`
HVAC (CAN)	`7E4`
HVAC (Climate)	`251`
HVAC (Climate)	`251`
HVAC (Climate)	`744`
HVAC (Climate)	`783`
HVAC (Climate)	`7E5`
HVAC (Heat, Ventillation and Air Conditioner)	`688`
HVAC (Heat, Ventillation and Air Conditioner)	`783`
HVAC (Heater, ventilation, A/C)	`272`
HVAC / Climate	`763`
HVAC / Climate	`76D`
HVAC / Climate	`771`
HVAC / Climate	`7B3`
HVAC / Climate	`7E4`
HVAC 2 (29-bit)	`18DA98F1`
HVAC Control Module	`733`
HVAC Rear	`71A`
HVAC Rear	`71A`
Heater & air conditioning	`744`
Heater, ventilation and A/C	`688`
Heating HV Battery	`18040011`
Heating HV Battery	`18040011`
Heating Reductant Tank	`17FC1781`
Heating Reductant Tank	`17FC1781`
Injection Valve Heater Control Unit	`17FC1688`
Injection Valve Heater Control Unit	`17FC1688`
Neck Heating Left	`17FC165E`
Neck Heating Left	`17FC165E`
Neck Heating Right	`17FC165F`
Neck Heating Right	`17FC165F`
PACM	`750`
PTC Heater Amplifier	`7D9`
Parking Heater	`17FC006A`
Parking Heater	`17FC006A`
Rear Climate Control	`17FC001A`
Rear Climate Control	`17FC001A`
Rear Climate Panel	`778`
Rear HVAC	`785`
Rear HVAC	`798`
Remote Control Auxiliary Heater	`17FC161A`
Remote Control Auxiliary Heater	`17FC161A`
Seat heater	`6D8`
Thermal Management	`18DA13F1`
Thermal Management	`18DA13F1`
Thermal Management	`742`
Thermal Management	`742`
WACM	`725`

Which makes define it?

The map holds 117 definitions for this type, spread across 29 make groups:

Address and protocol

Every definition in the map is marked as UDS. 61 of the addresses are 11-bit CAN identifiers (three digits, such as 7E0) and 56 are 29-bit extended identifiers (such as 18DA10F1). The most frequent addresses for this type are: 688 (3), 733 (3), 744 (3), 17FC0019 (2).

An address being defined in the map does not mean the module can be read on every vehicle. Reaching modules outside the mandatory OBD-II emissions channel depends on the manufacturer protocol and on the vehicle itself.

Related fault codes

Fault codes stored in this module usually belong to these groups:

Looking for what a fault code means? Fault code library.

Other module types

← All ECU modules

Climate Control Module on your own vehicle

With an ELM327-based BLE OBD2 adapter, CarCoding scans the vehicle’s modules, reads fault codes from those it can reach and explains every code in plain language. Which modules are reachable depends on the make and on the vehicle. The app is free to download.

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Data source: the CarCoding ECU scan map (ecuDatabase.ts). The addresses and names in the table are definitions from the map; they can differ depending on the hardware and software version in your vehicle.

Disclaimer: This page offers general information and does not replace an inspection by a qualified workshop. Any work carried out on the vehicle is your own responsibility.