Question about 1999 Ford Expedition

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Is there a fuse or relay for air suspension for a 1999 expedition

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Hello
Since you're looking for fuses and relays, I will assume that the compressor is not working. First check the suspension service shut off
switch located under the right side of the dash. If thats on, go to the fuse block under the left side of the dash and check fuses #4-#5-#20-#2
If they're ok, move to the fuse block under the hood on the left fender and check fuse #109 a large 50amp fuse it's best to use a 12v test light.
If that checks out, check the compressor relay located near the right
headlight assy. there will be 4 wires from the relay, lt blue/pink(hot to fuse #109) lt green/red(grnd to compressor) grey/red pwr to compressor)
drk blue/yell to suspension/steering module located behind ctr of dash.
Before you start these tests turn key to on(should be on for all tests)
use the 12v test light and test for power from grey/red wire at the
compressor + check lt grn/red wire for good ground. If you have pwr+grnd it's most likely a bad compressor. But if no power perform the
above tests. Hope this helps.

Posted on Jul 05, 2010

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Yes, there should be a relay for it under your hood or under your dash

Posted on Jul 05, 2010

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It is a relay for this vehicle, but with all the problems that these air systems cause most consumers are going to the passive non air systems. This is probably what you need to consider, check out Strutmasters.com!!! They'll hook you up!!!

Posted on Jul 14, 2010

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Posted on Jan 02, 2017

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2 Answers

I dont have power going to my air ride pump? What could it be


Fuse , relay maybe.
Fuse #109 50 amp . under hood fuse/relay box .

Air Suspension Compressor Relay, 4.6L C1000
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Air Suspension Compressor Relay, 5.4L C1000
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How to replace height sensor on 1999 ford expedition


it is at the rear end and looks look a guide rail with a plug I would first try to clean the connector and apply carbon conductive grease/NOT LITHIUM==OR DIELECTRIC THERE THE WRONG STUFF/and see if it responds it's only been there for 161/2 years braving winter after winter and its either still good or done from a lack of attention needed taking it out and really cleaning just might save some$$$$$

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I have a 99 expedition, air ride suspension went out. Changed the air compressor and still will not air up. Checked the relay and seems to be working. One other time this happened and friend changed a...


Your best bet take it an have it diagnosed ! This is computer controlled an may have DTC'S - diagnostic trouble codes stored !
C1724 Air Suspension Height Sensor Power Circuit Failure Air Suspension Control Module GO to Pinpoint Test F . C1726 Air Suspension Rear Pneumatic Failure Air Suspension Control Module GO to Pinpoint Test G . C1760 Air Suspension Rear Height Sensor High Signal Circuit Failure Air Suspension Control Module GO to Pinpoint Test H . C1770 Air Suspension Vent Solenoid Output Circuit Failure Air Suspension Control Module GO to Pinpoint Test I . C1790 Air Suspension LR Air Spring Solenoid Output Circuit Failure Air Suspension Control Module GO to Pinpoint Test J . C1795 Air Suspension RR Air Spring Solenoid Output Circuit Failure Air Suspension Control Module GO to Pinpoint Test K . C1830 Air Suspension Compressor Relay Circuit Failure Air Suspension Control Module GO to Pinpoint Test L
Symptom Chart Condition Possible Sources Action
  • No communication with the air suspension control module
  • CJB Fuse 4 (15A), 6 (5A) and 20 (5A).
  • Circuitry.
  • Air suspension control module.
  • Air suspension switch.
  • GO to Pinpoint Test A .

You replaced a part that you probably didn't need !
  • The compressor is inoperative
  • BJB Fuse 109 (50A).
  • Air compressor assembly.
  • Circuitry.
  • Air suspension relay.
  • GO to Pinpoint Test Q .

There is a lot to this system an guessing as to what the problem is ,isn't the way to fix it.
Measure the voltage between air compressor relay C1000 Pin A, Circuit 1053 (LB/PK), harness side and ground.
  • Is the voltage greater than 10 volts?
Yes GO to Q3 .

No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
Measure the resistance between air compressor C1000 Pin B, Circuit 538 (GY/RD), harness side and air compressor assembly C194M Pin 4, Circuit 538 (GY/RD), harness side.
  • Is the resistance less than 5 ohms?
Yes GO to Q4 .

No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
Air Suspension Height Sensor
One air suspension height sensor is mounted on the vehicle. The air suspension height sensor sends a voltage signal to the air suspension control module. The output ranges from approximately 4.75 volts at minimum height (when the vehicle is low or in full jounce), to 0.25 volts at maximum height (when the vehicle is high or in full rebound). The air suspension height sensor has a useable range of 80 mm (3.2 in) compared to total suspension travel of 200-250 mm (8 to 10 in) at the wheel. Therefore, the air suspension height sensor is mounted to the suspension at a point where full rear suspension travel at the wheel is relative to 80 mm (3.2 in) of travel at the air suspension height sensor. The air suspension height sensor is attached between the No. 5 frame crossmember (upper socket) and the panhard rod (lower socket). Replace the air suspension height sensor as a unit.
When the air suspension height sensor indicates that the rear of the vehicle is lower than trim under normal driving conditions, the air compressor will turn on and pump compressed air to the air springs. When the sensor indicates that the rear of the vehicle is raised above trim under normal driving conditions, this will cause the air to be vented from the air springs to lower the vehicle back to its trim height level.
Compressor Relay
The compressor relay is energized by the air suspension control module to allow high current to flow from the battery to the compressor motor.
  • A solid state relay is used in the air suspension system for air compressor control. The relay incorporates a custom power metal oxide semi-conductor field effect transistor (MOSFET) and ceramic hybrid circuitry. The relay switches high current loads in response to low power signals and is controlled by the logic of the air suspension control module.
  • Air Suspension Control Module
    NOTE: The 4WAS air suspension control module is used for the RAS system. The internal processor recognizes external circuitry to determine if it is installed in a 4WAS or a RAS equipped vehicle.
    NOTE: The air suspension control module is calibrated with information from the air suspension height sensor. A new or exchanged air suspension control module requires a ride height adjustment calibration process to be performed.
    The air suspension control module controls the air compressor motor (through a solid state relay), and the air spring solenoids. The air suspension control module also provides power to the air suspension height sensor. The air suspension control module controls vehicle height adjustments by monitoring the air suspension height sensor, vehicle speed, a steering sensor, acceleration input, the door ajar signal, transfer case signals, and the brake pedal position (BPP) switch. The air suspension control module also conducts all fail-safe and diagnostic strategies and contains self-test and communication software for testing the vehicle and related components.
    The air suspension control module monitors and controls the air suspension system through a 32-pin two-way connector. The air suspension control module is keyed so that the air suspension control module cannot be plugged into an incorrect harness. There are two sides of the harness connection to the air suspension control module. Each is uniquely colored and keyed to prevent reversing the connections.

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1 Answer

Location of rear air suspension relay 99 expedition


The system is fused only, it is located in the underhood fuse box.
Fuse #109 50A** Air Suspension Compressor

Jun 01, 2012 | 2000 Ford Expedition

1 Answer

How to jumper a relay for air suspension 1999 ford expedition?


It was given on the previous post with the instruction and wire location,if you repost for me ill help you, if you repost for some one else let them help you

Apr 30, 2011 | 1999 Ford Expedition

2 Answers

I changed my air compressor for my air ride suspension and now i have no power to my compressor. i changed the compressor relay as well.


check the fuses and the switch in drivers side rear compartment to make sure there is power to it.

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How to change rear air suspension on 1999 ford


Change the air suspension to a non air conversion system from Strutmasters. Their kit will save you lots of money and time. Check them out!

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1 Answer

1999 ford expedition


relays fuses are located on driver side under instrument panel.and in the left fenderwell in the engine compartment.check the suspension pump some times the relay is on the pump.

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