Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSACURA2018MDX BASEREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEM - SERVICE, TESTING AND TROUBLESHOOTING (EXCEPT HYBRID)CONNECTOR VIEWCLIMATE CONTROL UNIT CONNECTOR FOR INPUTS AND OUTPUTS (2017 2018 2019 2020)
2018 Acura MDX Base
Climate Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)
2018 Acura MDX BaseSECTION Climate Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)
| Connector Index |
|---|
| Climate Control Unit Connector A (32P) |
| Climate Control Unit Connector B (28P) |
Climate Control Unit Connector A (32P) (female terminals)
CONNECTOR A
| Cavity | Terminal name | Description | Signal |
|---|---|---|---|
| 1 | SENSOR 5V | Outputs sensor 5 V | With vehicle in ON mode: about 5. 0 V |
| 2 | Not used | ---- | ---- |
| 3 | R MHEAT | Outputs to drive rear mode control motor to HEAT side | With vehicle in ON mode and rear mode control motor moving to HEAT: battery voltage |
| 4 | R MVENT | Outputs to drive rear mode control motor to VENT side | With vehicle in ON mode and rear mode control motor moving to VENT: battery voltage |
| 5 | M COOL RR | Outputs to drive rear air mix control motor to COOL side | With vehicle in ON mode and rear air mix control motor moving to COOL: battery voltage |
| 6 | M HOT RR | Outputs to drive rear air mix control motor to HOT side | With vehicle in ON mode and rear air mix control motor moving to HOT: battery voltage |
| 7 | M COOL R | Outputs to drive passenger's air mix control motor to COOL side | With vehicle in ON mode and passenger's air mix control motor moving to COOL: battery voltage |
| 8 | M HOT R | Outputs to drive passenger's air mix control motor to HOT side | With vehicle in ON mode and passenger's air mix control motor moving to HOT: battery voltage |
| 9 | IDEF M-COOL | Outputs to drive mode control motor B to DEF side | With vehicle in ON mode and mode control motor B moving to DEF: battery voltage |
| 10 | IDEF M-HOT | Outputs to drive mode control motor B to HEAT side | With vehicle in ON mode and mode control motor B moving to HEAT: battery voltage |
| 11 | MDEF | Outputs to drive mode control motor A to HEAT side | With vehicle in ON mode and mode control motor A moving to HEAT: battery voltage |
| 12 | MVENT | Outputs to drive mode control motor A to VENT side | With vehicle in ON mode and mode control motor A moving to VENT: battery voltage |
| 13 | M COOL L | Outputs to drive driver's air mix control motor to COOL side | With vehicle in ON mode and driver's air mix control motor moving to COOL: battery voltage |
| 14 | M HOT L | Outputs to drive driver's air mix control motor to HOT side | With vehicle in ON mode and driver's air mix control motor moving to HOT: battery voltage |
| 15 | M REC | Outputs to drive recirculation control motor to RECIRCULATE side | With vehicle in ON mode and recirculation control motor moving to RECIRCULATE: battery voltage |
| 16 | M FRS | Outputs to drive recirculation control motor to FRESH side | With vehicle in ON mode and recirculation control motor moving to FRESH: battery voltage |
| 17 | SENSOR COM | Sensor ground | With vehicle in ON mode: less than 0. 2 V |
| 18 | Not used | ---- | ---- |
| 19 | HUMID SENS | Inputs humidity sensor signal | ---- |
| 20 | SENS TR | Inputs in-car temperature sensor signal | ---- |
| 21 | TRR | Inputs rear evaporator temperature sensor signal | ---- |
| 22 | Not used | ---- | ---- |
| 23 | SENS TSUN | Detects sunlight sensor signal | With vehicle in ON mode, and no sunlight or the sensor covered up: 3. 56 V With vehicle in ON mode, and sunlight on the sensor: less than 3. 56 V |
| 24 | TEVA | Inputs front evaporator temperature sensor signal | ---- |
| 25 | Not used | ---- | ---- |
| 26 | R MODE PT | Detects potentiometer signal of rear mode control motor (door position) | With vehicle in ON mode: about 1. 0-4. 0 V (depending on rear mode control motor position) |
| 27 | AMDP RR | Detects potentiometer signal of rear air mix control motor (door position) | With vehicle in ON mode: about 1. 0-4. 0 V (depending on rear air mix control motor position) |
| 28 | AMDP R | Detects potentiometer signal of passenger's air mix control motor (door position) | With vehicle in ON mode: about 1. 0-4. 0 V (depending on passenger's air mix control motor position) |
| 29 | IDEF AMD-P | Detects potentiometer signal of mode control motor B (door position) | With vehicle in ON mode: about 1. 7-4. 0 V (depending on mode control motor B position) |
| 30 | FR MODE | Detects potentiometer signal of mode control motor A (door position) | With vehicle in ON mode: about 1. 0-4. 0 V (depending on mode control motor A position) |
| 31 | AMDP L | Detects potentiometer signal of driver's air mix control motor (door position) | With vehicle in ON mode: about 1. 0-4. 0 V (depending on driver's air mix control motor position) |
| 32 | FRS REC MODE | Detects potentiometer signal of recirculation control motor (door position) | With vehicle in ON mode: about 1. 0-4. 0 V (depending on recirculation control motor position) |
Climate Control Unit Connector B (28P) (female terminals)
CONNECTOR B
| Cavity | Terminal name | Description | Signal |
|---|---|---|---|
| 1 | Not used | ---- | ---- |
| 2 | Not used | ---- | ---- |
| 3 | Not used | ---- | ---- |
| 4 | Not used | ---- | ---- |
| 5 | LED FR DEF | Switches front window defogger button LED ON/OFF | ---- |
| 6 | SW OUT 3 | Outputs climate control switch signal | ---- |
| 7 | SW OUT 1 | Outputs climate control switch signal | ---- |
| 8 | SW IN 2 | Inputs climate control switch signal | ---- |
| 9 | B-CAN_H | B-CAN_H communication signal | With vehicle in ON mode: pulses |
| 10 | B-CAN_L | B-CAN_L communication signal | With vehicle in ON mode: pulses |
| 11 | R-BLW-G | Outputs rear power transistor gate voltage | With vehicle in ON mode, and rear fan control icon OFF: less than 0. 2 V With vehicle in ON mode, and rear fan control icon ON: about 4. 0 V-battery voltage (depending on rear blower motor control) |
| 12 | SGND | Ground for climate control unit (G504) | With vehicle in ON mode: less than 0. 2 V |
| 13 | IG2 HAC | IG2 power source | With vehicle in ON mode: battery voltage |
| 14 | BLOWER(V) | Feedback signal of front power transistor drain voltage | Feedback signal of front power transistor drain voltage |
| 15 *1 | IG1 METER (DC/DC) | IG1 power source | With vehicle in ON mode: battery voltage |
| 16 | Not used | ---- | ---- |
| 17 | VDC+ | Outputs 12 V to A/C compressor variable capacity control solenoid | Variable voltage based on cooling load. With A/C compressor at maximum: battery voltage |
| 18 | VDC- | Ground for A/C compressor variable capacity control solenoid | With vehicle in ON mode: less than 0. 2 V |
| 19 | LED RR DEF | Switches rear window defogger/mirror defogger button LED ON/OFF | ---- |
| 20 | LED AUTO DEF | Switches AUTO button LED ON/OFF | ---- |
| 21 | SW OUT 2 | Outputs climate control switch signal | ---- |
| 22 | SW IN 3 | Inputs climate control switch signal | ---- |
| 23 | SW IN 1 | Inputs climate control switch signal | ---- |
| 24 | Not used | ---- | ---- |
| 25 | LIN AC | Communication to rear climate control panel | ---- |
| 26 | BLOWER(G) | Outputs front power transistor gate voltage | With vehicle in ON mode, and front fan control icon OFF: less than 0. 2 V With vehicle in ON mode, and front fan control icon ON: about 4. 0 V-battery voltage (depending on blower motor control) |
| 27 | Not used | ---- | ---- |
| 28 | R-BLW-V | Feedback signal of rear power transistor drain voltage | With vehicle in ON mode: about 0 V-battery voltage (depending on rear blower motor speed) |
*1: With auto idle stop system
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.