Inputs And Outputs
Five electrical connectors provide the interface between the ATC module and the vehicle/heater assembly wiring.
Both the manual and automatic systems receive ambient temperature, engine coolant temperature, engine speed and vehicle speed inputs in K bus messages from the instrument cluster. If the K bus messages are missing or faulty, the ATC module adopts the following default values:
- Ambient temperature = 0°C (32°F).
- Engine coolant temperature = 80°C (176°F).
- Engine speed = 800 rev/min.
- Vehicle speed = zero.
If a fault develops in the input from the temperature selector switch on the control panel, the ATC module adopts a default value of 24°C (75°F).
ATC MODULE HARNESS CONNECTOR C0249 PIN DETAILS
| Pin No. | Description | System | Input/Output | |
|---|---|---|---|---|
| Manual | Automatic | |||
| 1 | Front seat heating battery power supply | Yes | Yes | Input |
| 2 | (LH) front seat heater power supply | Yes | Yes | Output |
| 3 | (RH) front seat heater power supply | Yes | Yes | Output |
ATC MODULE HARNESS CONNECTOR C0923 PIN DETAILS
| Pin No. | Description | System | Input/Output | |
|---|---|---|---|---|
| Manual | Automatic | |||
| 1 | Rear blower control voltage | No | Yes | Output |
| 2 | Rear blower switch signal | No | Yes | Input |
| 3 | Not used | - | - | - |
| 4 | (LH) heater temperature sensor | No | Yes | Input |
| 5 | (RH) heater temperature sensor | Yes | Yes | Input |
| 6 | Evaporator temperature sensor | Yes | Yes | Input |
| 7 | Blower control voltage | Yes | Yes | Output |
| 8 | Rear temperature switch | No | Yes | Input |
| 9 | Sensor ground (evaporator, heater temperature sensors, rear passenger face register, as applicable) | Yes | Yes | - |
| 10 to 12 | Not used | - | - | - |
| 13 | Recirculation door motor signal 2 | Yes | Yes | Input |
| 14 | Recirculation door motor signal 2 | Yes | Yes | Output |
| 15 | Recirculation door motor signal 1 | Yes | Yes | Output |
| 16 | Recirculation door motor signal 1 | Yes | Yes | Input |
| 17 | Rear blower switch and rear temperature switch power supply | No | Yes | Output |
| 18 | Not used | - | - | - |
ATC MODULE HARNESS CONNECTOR C1629 PIN DETAILS
| Pin No. | Description | System | Input/Output | |
|---|---|---|---|---|
| Manual | Automatic | |||
| 1 | Ignition power supply | Yes | Yes | Input |
| 2 | Sunlight sensor ground | No | Yes | - |
| 3 | K bus | Yes | Yes | Input/Output |
| 4 | Delayed accessory power | Yes | Yes | Input |
| 5 | (LH) coolant valve | Yes | Yes | Output |
| 6 | (RH) coolant valve | No | Yes | Output |
| 7 | HRW relay | Yes | Yes | Output |
| 8 | Windshield washer jets heater relay | Yes | Yes | Output |
| 9 | Auxiliary coolant pump | Yes | Yes | Output |
| 10 | Refrigerant pressure sensor signal | Yes | Yes | Input |
| 11 | Not used | - | - | - |
| 12 | Pollution sensor signal | No | Yes | Input |
| 13 | Pollution sensor power supply | No | Yes | Output |
| 14 | Heated windshield relay | Yes | Yes | Output |
| 15 | (LH) seat heating temperature sensor | Yes | Yes | Output |
| 16 | (RH) seat heating temperature sensor | Yes | Yes | Output |
| 17 | Engine full load signal | Yes | Yes | Input |
| 18 | (LH) sunlight sensor signal | No | Yes | Input |
| 19 | (RH) sunlight sensor signal | No | Yes | Input |
| 20 | Refrigerant pressure sensor ground | Yes | Yes | - |
| 21 | Refrigerant pressure sensor power supply | Yes | Yes | Output |
| 22 | Coolant changeover valve | Yes | Yes | Output |
| 23 | Instrument illumination | Yes | Yes | Input |
| 24 | Sunlight sensor power supply | No | Yes | Output |
| 25 | Pollution sensor heater ground | No | Yes | - |
| 26 | Pollution sensor heater power supply | No | Yes | Output |
ATC MODULE HARNESS CONNECTOR C1630 PIN DETAILS
| Pin No. | Description | System | Input/Output | |
|---|---|---|---|---|
| Manual | Automatic | |||
| 1 | Battery power supply | Yes | Yes | Input |
| 2 | air conditioning (A/C) compressor clutch | Yes | Yes | Output |
| 3 | System ground | Yes | Yes | - |
ATC Module Harness Connector C2295 Pin Details
| Pin No. | Description | System | Input/Output | |
|---|---|---|---|---|
| Manual | Automatic | |||
| 1 | M bus power supply | No | Yes | Output |
| 2 | M bus ground | No | Yes | - |
| 3 | M bus interface line | No | Yes | Input/Output |