HVAC Control Unit Inputs and Outputs
HVAC CONTROL UNIT REFERENCE
| Cavity | Wire color | Terminal name | Description | Signal |
|---|---|---|---|---|
| 1 | PNK | M-COOL | Drives air mix control motor to COOL | With ignition switch ON (II) and air mix control motor moving to COOL: battery voltage |
| 2 | PNK/BLU | M-HOT | Drives air mix control motor to HOT | With ignition switch ON (II) and air mix control motor moving to HOT: battery voltage |
| 3 | YEL/BLU | M-DEF | Drives mode control motor to DEF | With ignition switch ON (II) and mode control motor moving to DEF: battery voltage |
| 4 | YEL/RED | M-VENT | Drives mode control motor to VENT | With ignition switch ON (II) and mode control motor moving to VENT: battery voltage |
| 5 | GRY | S5V | Sensor 5 V output | With ignition switch ON (II): about 5 V |
| 6 | PNK/BLK | AMD-P | Detects air mix control motor position | With ignition switch ON (II) and air mix door at HOT: about 4.5 V With ignition switch ON (II) and air mix door at COOL: about 1.5V |
| 7 | BRN | Teva | Evaporator temperature sensor input | With ignition switch ON (II): between 1.0 V and 4.0 V depending on evaporator temperature. About 2.5 V at 72°F (22 °C). |
| 8 | YEL/GRN | MODE 2 | Mode control motor signal 2 | With ignition switch ON (II): about 5 V or about 0 V, depending upon mode |
| 9 | BRN/WHT | MODE 1 | Mode control motor signal 1 | With ignition switch ON (II) about 5 V or about 0 V, depending upon mode |
| 10 | LT GRN | S-COM | Sensor ground | Less than 0.5 V at all times |
| 11 | BLU/RED | BLW-V | Power transistor feedback | With ignition switch ON (II) and blower OFF: between 5 V and 12 V. Voltaqe decreases as blower speed increases |
| 12 | BLU/WHT | ACS | A/C compressor ON request | With ignition switch ON (II), A/C pressure switch closed, and A/C request OFF: battery voltage. When A/C request switches ON, voltage changes to about 0 V. |
| 13 | BLU/YEL | BLW-G | Power transistor control output | With ignition switch ON (II) and blower OFF: 0 V. Voltage increases as blower speed increases |
| 15 | GRN/WHT | FRS | Drives the recirculation control motor to FRESH | With ignition switch ON (II) with motor moving to FRESH: battery voltage |
| 16 | GRN/YEL | REC | Drives the recirculation control motor to REC | With ignition switch ON (II) with motor moving to REC: battery voltage |
| 21 | YEL | MODE 4 | Mode control motor signal 4 | With ignition switch ON (II) about 5 V or about 0 V, depending upon mode |
| 22 | BLK/WHT | MODE 3 | Mode control motor signal 3 | With ignition switch ON (II) about 5 V or about 0 V, depending upon mode |
| 23 | BLK/WHT | Illumination cancel signal from gauge control module | ||
| 26 | BLK | GND | Ground for heater control panel | Less than 0.5 V at all times |
| 27 | RED/BLK | ILL+ | Power source for illumination | With ignition switch ON (II): battery voltage |
| 28 | RED | ILL- | Ground for illumination | With combination light switch ON: voltage decreases as dash light brightness increases |
| 29 | WHT/RED | +B | Battery power source | Battery voltage at all times |
| 30 | BLK/YEL | IG2 | IG2 power source | With ignition switch ON (II): battery voltage |