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    How to test air suspension compressor relay

    • The headlight is on the front part of the cavity and on the back part you will see a small batwing shaped device with a finned heatsink. Is it easier to access the relay from underneath the truck looking up or by moving the windshield washer Inspect the fuse for the air suspension compressor. Federal Motor Vehicle Safety Standard 121 dictates how this is to be done for over-the-road vehicles. CAUTION: A Jaguar Land Rover-approved Midtronics battery power supply must be connected to the vehicle battery during SDD diagnosis/ module programming . W6 CHECK AIR COMPRESSOR RELAY Air Compressor Relay C1000 Connect a fused (50A) jumper wire (10 gauge) between air compressor relay C1000 pin A, circuit 1053 (LB/PK), harness side and air compressor relay C1000 pin B, circuit 538 (GY/RD), harness side. Page 11 of 21 &. Step 2: Release the air pressure. Air Suspension Compressor Relay by RMT®. The low current circuit is the control circuit that activates or deactivates the relay. Check the air Air compressor Yet another common failure is the air compressor. If you do, voltage drop will burn up wires. 34. With the relay in the configuration that has the 2 load pins connected, place the test voltage on 1 of the load pins of the relay and an automotive test light on the other load pin of the relay. . The air compressor is what provides the air suspension system with compressed air required for it to function. Select ‘Air Suspension Transportation/Customer Mode’. Test the BK wire in Pin D for ground. That is the relay. Another symptom that the AC relay has potentially failed is that there will be no cold air at all from the AC. Check for Recalls, Technical Service Bulletins; Home > Mercedes Benz Air Suspension Troubleshooting Guide Airmatic Visit Workshop > air suspension relay and fuse The suspension system cannot function without it. REPLACE the air compressor relay. WEIGHT REMOVED When weight is removed: The air suspension height sensor length is increased from the trim length, sending a "rear is high" signal to the control module. All the other wiring matches the diagram you provided. As for the test I originally did with my Air compressor, I can only deduce that it was not generating enough pressure. If the fuse is bad, replace it and test again. The suspension system cannot function without it. Press the ‘raise’ button and check for a response. Mounting the Air Tank • The air tank can be mounted anywhere on the vehicle in any position. Start the engine and build up the air pressure until the compressor governor cuts out. If the compressor is failing to come on at all, then that is a sign that it has either failed or it is having an issue. Lastly, when everything was plugged in, wires and compressor were warm to the touch. By activating I specifically mean allowing voltage to pass thru' the relay (internally) and on its way to the component that needs to activate (fuel pump, cooling fan relay, A/C compressor, etc. Check that suspension ride heights are within specification. The system is controlled by a computer, which turns an air compressor on and off to maximize rider comfort. Got home and checked the 50a fuse inside fuse box and it was fine. Tip: You can also test the compressor by jumping it with jumper wires or a Power Probe. I later found on-line that some air suspension systems can operate at 125psi system components: i. How the air suspension works. Every single component is new and not remanufactured. Air Suspension/EVO Test Connector: RH side of engine compartment, top of wheel well C117 Soft Ride Relay: Under center front of package tray C403Hard Ride Relay: Under center rear of package tray C404 sorry could not find compressor rely listed, good luck Here are the test procedures for the air ride suspension system: TEST H: AIR SUSPENSION LEFT REAR OR RIGHT REAR CORNER UP TIMEOUT Connect New Generation Star (NGS) tester. Take a bottle and fill it with water. To lower the suspension we will be activating the same corner valves in combination with the exhaust valve. I was unable to detect any air ride systemic problems during 2014's warmer months. 1. Access to test a relay in place can be difficult. The purpose of an air brake system on heavy duty vehicles is to convert air pressure to mechanical energy to activate the foundation brakes. Set vehicle to ‘Customer Mode’. He said the bags all looked fine, but they couldn't hear the compressor start up at all. 35. 3. Started driving and about a block away from the house got the "check air ride" msg and truck was low all around. My friend informed me that mine has the air ride suspension. When the desired ride height is reached, the module turns the compressor turns off and remains on standby until further corrections are needed. • The relay is located in the fuse box in the engine bay. Grounding this wire with the ignition on activates the relay which controls the compressor to test the circuit. I waited, and waited. Until, I lowered the truck off of the lift, and turned the ignition to on. Begin by locating and removing the compressor relay, the vehicle may need to be running for this test. Please check fuse F6 40A and relay R1 in the front distribution fuse box. Here are the test procedures for the air ride suspension system: TEST H: AIR SUSPENSION LEFT REAR OR RIGHT REAR CORNER UP TIMEOUT Connect New Generation Star (NGS) tester. The 30amp fuse they tell you to pull to replace the pump is good and if I pull it the message on the dash displays a problem with the suspension system. This device makes sure the air tank is always at correct pressure, so that suspension changes can be done quickly (they say under 4 seconds). Now add a little or few drops of soap solution to the bottle. This code indicates an open circuit or a short often in the compressor motor relay, which could be caused by a blown IGN 3 fuse or an issue with the air suspension compressor. Relay and fuse still check good. Automotive test lights are available at auto parts stores and hardware stores. Check for Recalls, Technical Service Bulletins; Home > Mercedes Benz Air Suspension Troubleshooting Guide Airmatic Visit Workshop > air suspension relay and fuse Product Details. Suspension all the way down front height sensor voltage is around 1v but the rear height sensor voltage is around 4v. When i short dB/Y on the module compressor runs but the thing is air shock solenoid not opening. (sensor cannot be on bottom) At the rear fuse block, check Fuse #48, 4WD, 15A. Compressor Installation. If the compressor fails to turn on, you could have several issues at once, including a burnt out suspension compressor, leaks in your air shocks, and even a blown fuse or relay. If air compressor turns on and then off, go to next step. A failed compressor relay is a top cause of air The Air Suspension Control Module monitors the Air Suspension Compressor Relay. If the system operates use soapy water to test for other leaks, older systems will likely have a few weak areas. Not sure if the "check susp" light shuts down the compressoror electrical signal to the rear suspension system. SOURCE: Is there a fuse or relay for air suspension for a. How To Test Air Suspension Compressor Relay? Method 1: Air Leaks. Air will bleed back out through compressor. Bought new rear OEM shocks (air bags) and hoped it would all turn on I did confirm that the air solenoids were clicking (thanks for the tip MikeA). We can test the compressor by checking its power which can be easily identified by knowing Method 3: Short video showing how to test to see if your ALC Relay in your air ride suspension is good. I added weight to the rear of the truck (to the point the compressor should kick on) and it still read 0. No cold air. L322 Air Suspension Manual Operation. The automotive test light should light. The ECU controls the air compressor through a solid state relay. There is also a relay between this fuse and the electronic suspension control module. Product Details. 7v … read more Chuck The control module then turns off the air compressor (through the relay) and closes the air spring solenoid valves. The replacement relay is still operating without a problem. Next test the system fuses, fuses 17 and 18 in the block in the dash, and the 30 amp pump fuse in the under-hood fuse box. Checking for Component Failure in the Air Suspension System Diagnosis 1. Hello Since you're looking for fuses and relays, I will assume that the compressor is not working. It is held on by two small nuts and has a 4 pin connector. Consult a repair manual to determine which terminals are which on the compressor electrical connector. Does the air compressor run? Yes DISCONNECT the jumper wire. Started as usual, air compressor kicked on as normal. The Air Suspension Control Module sets the OBDII code when the Air Suspension Compressor Relay is not to factory specifications. Do you see a single yellow wire somewhere near the air compressor? It should have a connector on it but not be hooked up to anything. Part 1 of 2: Removing the air suspension air compressor from the vehicle. I just replaced the compressor, sensor, and relaystill not working. The check susp light is on and I am not sure if I have to have someone clear the codes. You say you've proved the compressor and checked R4, according to the diagram R4 is the wash wipe relay. While there are several reasons as to why an AC may stop producing cold air, a failed relay can be one The low current circuit is the control circuit that activates or deactivates the relay. The leveling system is however working correctly and the car will still automatically adjust itself if parked on the slope. 33. AIR SUS Relay Supply the electricity to the compressor & motor with dryer. If fuse regularly blows, purchase and install a new relay. Hi All, can someone help me locate the Relay and fuse location of the Air suspension compressor for my 2006 Viano. Depress the service brake treadle slowly and then release. The NEW compressor from Arnott, (through Rock Auto) (also a Wabco part) got here the next day. If it's good, test the relay with the test light. . This inflation raises the rear of the vehicle to regain the desired suspension position. WHITE RED (+) 20 AMP FUSE RELAY HARNESS BLACK (GROUND) RED (+) BATTERY (+) ORANGE RELAY HOUSING DRILL 3/16” HOLE IN SUITABLE LOCATION ON VEHICLE (COMPRESSOR +) (SWITCH PANEL) FLAT WASHER - MACHINE SCREW-LOCK NUT AIR COMPRESSOR INSTALL RELAY HARNESS 7 x 2 1 Select a safe location within 3 feet of the air compressor. Test these first and then we can move on. Select ‘Air Suspension Deflate’. If there is a leak in suspension, the air tank is asked to refill shocks much more often. Testing the Function of the Air Compressor. air compressor. At the rear fuse block, check Fuse #48, 4WD, 15A. I removed the compressor unit and tested put 12 volts to it, it came on but only very slowly, we had just had the beast from the east it had bing sitting in deep snow, after a while of running it check under the back of the truck first to see if you still have air shocks i know some people swap out the air shocks for gas shocks and bypass the compressor so the service ride control message doesn't show try it before you go to the dealer again. Select ‘Set-up and Configuration’. When the suspension is lower than its normal ride height, the system module energizes a relay to turn on a compressor and pump air into the air springs, shocks or struts through solenoid valves. I did confirm that the air solenoids were clicking (thanks for the tip MikeA). 2 Mark and system components: i. There is no flat 4 wire air suspension relay coming out of either the top or bottom of the wiring harness where the air compressor is at the RH front side of the Navigator. General Overview: To raise the suspension, we will want to momentarily trigger the air valves and the compressor relay circuit. This will be evident when the pressure gauge needles stop rising. Using the scan tool, open the vent valve and relieve all of the air pressure from the air lines. With a test light connected to a ground you should fine one relay terminal that has power full time, that is from a 50 amp fuse in the junction box. ). There was a click in the compressor, but it didn't turn on. The air ride suspension on a Mercury Grand Marquis gives the vehicle a remarkably smooth ride. The relay incorporates a custom power metal oxide semi-conductor field effect transistor (MOSFET) and ceramic hybrid W6 CHECK AIR COMPRESSOR RELAY Air Compressor Relay C1000 Connect a fused (50A) jumper wire (10 gauge) between air compressor relay C1000 pin A, circuit 1053 (LB/PK), harness side and air compressor relay C1000 pin B, circuit 538 (GY/RD), harness side. The relay signal comes from the module on the dark blue with yellow trace wire into the relay but only when the system turns the compressor on. I lowered the compressor, left it plugged in, and tapped into the wires with a test light. If it does nothing check that the suspension switch in the trunk on the passenger side, if it was turned off or failed the air ride shuts down. 00. When the Compressor Overheats it can cause damage to the Relay and need replacement. Standard shocks are enhanced with air bags, similar to the style used in large tractor trailers. compressor relay, fuses, leaking air bladder(s), valve block or air lines/fittings. 1997-2006 Expedition & Navigator - Air ride suspension compressor relay - The original compressor on this '01 4x4 front & rear system has stopped working. Method 2: Compressor Testing. system components: i. Air Suspension Compressor Module X1. Bought new rear OEM shocks (air bags) and hoped it would all turn on Apply air to the pressure switch using an air compressor or some other air source that produces a pressure greater than that of the switch setting. It is recommended to always install a new relay when replacing your yir Suspension Compressor. (Part # - WIR8500) • Thomas Compressors (black) will require a 20 amp fuse (each). If it doesn't work, replace it. • Viair Compressor (silver) will require a 30 amp fuse (each). Put on your safety glasses. Blinks the height control OFF indicator light to alert the driver when the suspension control ECU detects a malfunction in the rear air suspension. Compressor Compressor provides air pressure for system operation. Trigger VDM Active Command COMPRESSR ON then OFF. THIS IS IMPORTANT – Jumping the “LOAD SIDE” of the relay should cause the pump to operate (CAUTION – jumping the control side will damage the control unit). If compressor does not turn on and off, go to TEST U . If thats on, go to the fuse block under the left side of the dash and check fuses #4-#5-#20-#2 It looks like my air suspension compressor has finally died. If it doesn't get power, check the relay running power to the compressor or the fuse running to the compressor. Install the air suspension compressor relay. It seems that the compressor is not running to supply any new air to the system. Pull the 30 amp and check that the contacts hold the fuse tight. I want to bypass the relay to see if the compressor runs. Fuses and relays Check for blown fuses and ensure the relay is working properly. This leads me to believe that the compressor isn't getting power either. So, another run to the store and got a relay that would fit for a test, and after a few gyrations getting the suspension to a height that the car would say "ok, run compressor" I was getting power to the compressor connector. However there is a 4 wire 70A square relay (F80B-14B192-AA) attached to the top of the air suspension compressor. I've replace the shocks and the valve block From starting and not driving, trying to the raise the suspension by pressing the button near the gear selector does not appear to raise the car and shortly after the malfunction warning comes on again. Circuit breaker is what trips and keeps wiring from burning out. Test for 12v on the BN wire in Pin G and on the OG wire in Pin H. …Run compressor without circuit breaker. It is not unimaginable to me that a 13 year old electrical part quit due to age. The relay incorporates a custom power metal oxide semi-conductor field effect transistor (MOSFET) and ceramic hybrid I replaced the rear shocks and the air compressor. The Electronic Control System disables the compressor motor relay when this code is thrown, and may cause you to think the Ride Control Relay has gone bad. If that fuse is good, turn your IGN to RUN with engine OFF. They both activated about 3 or 4 seconds after the pump turned on. Using a DMM to ensure power is getting to the compressor. In addition to the 40 amp fuse that directly powers the compressor, there is also a fuse that powers the primary side of the compressor relay. They are for the air suspension compressor. 21. A failed compression will cause the car to lower and not rise. 2004 lincoln navigator air suspension compressor wont come on changed compressor can jump it at the relay and works coil voltage at the is 9. The Air Suspension Control Module monitors the Air Suspension Compressor Relay. Place the test light on the power lead to the compressor (s). Quantity: 1 per Pack. When the time comes to raise the vehicle, the ECU grounds the compressor relay and the compressor begins to run. …Use less than #4 wires running to compressor from battery. 6 NOTE: Location of air suspension relay to be installed. Compressor head casting contains intake and exhaust valves, and exhaust valve solenoid. Air Suspension would not power on. Air Governor Test The air governor test will verify that the air governor is maintaining the proper pressure in air tanks. 2. This relay is connected to the side of the fuse box under your If you look under the front passenger side wheel arch towards the headlight, there is a cavity. Go to compressor and unplug Connector 1. I checked all the wiring every thing checked out fine. The ECU uses three height sensors to determine vehicle height, two up front and one out back mounted on the drivers side rear suspension arm. …Install compressor without backflow check valve. First check the suspension service shut off switch located under the right side of the dash. The system consists of: A compressor with built in vent solenoid and air drier Compressor relay Two air springs and spring solenoids A height sensor An on/off switch and a control module The control module also receives inputs from the courtesy light switches and vehicle speed sensor. I later found on-line that some air suspension systems can operate at 125psi The Air Suspension Control Module monitors the Air Suspension Compressor Relay. Compressor is located on right rear underbody, behind wheelwell. In instances of a leak in your air suspension, the compressor may turn on more often than you are used to, and may continuously run for up to five minutes. A solid state relay is used in the air suspension system for air compressor control. After the air lines have been depressurized, close the vent valve. Suspension system codes Be sure to review all DTC codes prior to new compressor installation. I figured the compressor was probably bad so I replaced the compressor and the relay just below the brake master cylinder. does your Deville have a light on the dash that shows leveling? should be yellow. I've replace the shocks and the valve block The ECU controls the air compressor through a solid state relay. I replaced the rear shocks and the air compressor. Check these areas first for signs of damage, repair any leaks and test the system again. The fuse for the level control compressor is located in the under the hood fuse block. The purpose of this book is to help you construct Meritor WABCO Truck and Tractor air systems. Step 1: Turn the ignition switch to the ON position. If the relay fails, the compressor will not operate and the AC system will be unable to produce any cold air at all. 00:00. All went well, everything went smooth. Is there a relay for the air suspension compressor on my car. It is generating the 1772 error, and then subsequently the 1400 error, and the compressor does not seem to be working. The compressor relay is energized by the air suspension control module to allow high current to flow from the battery to the compressor motor. Here's a simply way to test the actual relay mounted in the relay box Common air suspension leaks are from pipe fittings, damaged lines, damaged reservoir and split bags. additional relay that will plug into the RL2 port. If no response, check the voltage at the air compressor. It looks like my air suspension compressor has finally died. It is a 40 amp fuse number 61. e. When the ESCM detects a steady, substantial change in the position sensor signal voltages for at least 10 seconds, it responds by commanding the ELC relay ON, which activates the compressor, causing the air pressure in the shock absorber chambers to inflate. Compressor Relay When compressor relay is grounded by height sensor, voltage is supplied to compressor. Air suspension is a suspension of a vehicle powered by an electric air pump or compressor, which usually reduces the tendency of a vehicle to bounce over rough roads or hilly areas when it is empty. How to test air suspension compressor relay How To Test Air Suspension Compressor Relay? - Hydraulic . I don't have money for the Monroe strut and spring swap so I just want to to test the compressor to make sure it is the relay that is bad. I do not suspect I have any compressor problems that caused the factory relay to fail. Suspension Control ECU Controls the vehicle height according to the operation modes. Pulled the gray 4 prong relay behind the passenger headlight and jumped the wires and compressor kicked on. Step 5 With air applied to the pressure switch, place one lead of the ohm meter to one of the loose wires, and the second lead to the second loose wire. - The front of my car keeps going down. check under the back of the truck first to see if you still have air shocks i know some people swap out the air shocks for gas shocks and bypass the compressor so the service ride control message doesn't show try it before you go to the dealer again.