Where is the climate control PCB located on a GMC CK?
Where is the climate control PCB located on a GMC CK?
It is separately powered on Pin 1 from the dash light dimmer, and has no function in climate control, other than illumination. The climate control PCB is powered when the ignition switch is in the RUN position via Circuit #141. +12V comes in on Pin 5 in the upper left corner of the schematic.
Where is the AC relay located on a GMC CK?
The AC Relay is located external to the controller. The coil of the AC relay is powered from the ECU, located on the left side of the engine bay. The High Pressure, Cycling, and Lo pressure refrigerant switches also go to the ECU. When all conditions are met, the ECU provides power to the AC relay coil, and the AC compressor clutch is energized.
When do you need to replace the ECM power relay?
If there is no power when the key is inserted, the engine will not start, or the battery is dead, you may need to replace the ECM power relay. 1. No power when the key is inserted 2. Engine will not start 3. Battery drain or dead battery Average rating from 130,153 customers who received a Vehicle Engine Electrical Inspection.
How to repair GMC CK Series truck HVAC unit?
Use paper clips or wires to jumper across the switch connectors on the wire harness. Key on engine off, compressor clutch should “click”. If no click, check the wiring harness for open wires, functioning high pressure switch, and correct voltages. TESTING LOW PRESSURE SWITCH. With the truck running, A/C turned on.
It is separately powered on Pin 1 from the dash light dimmer, and has no function in climate control, other than illumination. The climate control PCB is powered when the ignition switch is in the RUN position via Circuit #141. +12V comes in on Pin 5 in the upper left corner of the schematic.
If there is no power when the key is inserted, the engine will not start, or the battery is dead, you may need to replace the ECM power relay. 1. No power when the key is inserted 2. Engine will not start 3. Battery drain or dead battery Average rating from 130,153 customers who received a Vehicle Engine Electrical Inspection.
The AC Relay is located external to the controller. The coil of the AC relay is powered from the ECU, located on the left side of the engine bay. The High Pressure, Cycling, and Lo pressure refrigerant switches also go to the ECU. When all conditions are met, the ECU provides power to the AC relay coil, and the AC compressor clutch is energized.
How does the ECM work in a car?
Your car’s Engine Control Module (ECM) monitors all the sensors in the vehicle to make sure that the car’s systems are running as they’re supposed to. When conditions change, the ECM will automatically make adjustments in real time. That is why it is so important to recognize the symptoms of ECM failure.
