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Air suspension not working?

Tiny
BHAMDOC1973
  • MEMBER
  • 2014 JEEP GRAND CHEROKEE
  • V8
  • 4WD
  • AUTOMATIC
  • 106,000 MILES
Bought it as is. I had my share if air suspension issues on other cars but never did deal with a jeep. All 4 are lower than they should at the same level. Is this common on these cars? And where do you recommend I start checking? Fuse, relay?
Thursday, September 28th, 2023 AT 8:39 PM

27 Replies

Tiny
BHAMDOC1973
  • MEMBER
  • 1,574 POSTS
Did a scan. Going under air suspension is not connecting. Going under active dampening says it's not configured. Doing a full scan found few codes. When inactivated the pump to all 4 wheels I hear it run.I checked the fuses and relay up front and looks good. I don't even know if there is any air lift in the system I don't know where the pump is. Maybe a bad/weak pump? Cause it looks like all 4 struts are down at sane level. Also noticed that the buttons do not light up when I press to raise or lower the car. Even the light that should light up when its in park is not on.
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Friday, September 29th, 2023 AT 9:39 AM
Tiny
KEN L
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Yes, please check the fuses first, also there is a relay for the suspension control module because it has lost communication. If the fuse and relay are okay, I would swap out the module. Here are the wiring diagrams for the system so you can see how the air suspension works and which fuses to check.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

The control relay is under the hood inside the PDC. Check out the images (below). Please let us know how it goes
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Friday, September 29th, 2023 AT 10:52 AM
Tiny
BHAMDOC1973
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But if module is bad how did the pump respond to me activating it?
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Friday, September 29th, 2023 AT 11:05 AM
Tiny
BHAMDOC1973
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All fuses are good. But fuse 5 the 40-amp shows negative always whether removed or installed. There is power and ground on the relay pins. All other fuses are good. Does this require the module to be VIN matched? How can I know whether it's a pump or a module issue?
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Friday, September 29th, 2023 AT 1:00 PM
Tiny
KEN L
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If you put power to the ORG/GRN wire at the compressor it should turn on. Also, the air suspension control module will need a verification test to start working, here is how the job is done.

STANDARD PROCEDURE - ASCM VERIFICATION TEST

PERFORM THE ASCM VERIFICATION TEST
Turn the ignition off.
Disconnect all jumper wires and reconnect all previously disconnected components and connectors.
Turn the ignition on.
With the scan tool, erase DTCs.
Make sure that all accessories are turned off and that the battery is fully charged.
Test drive the vehicle and verify proper operation.
With the scan tool, read the ASCM DTCs.

Are there any DTCs present in the Air Suspension Control Module (ASCM)?

Yes
(Refer to 28 - DTC-Based Diagnostics/MODULE, Air Suspension Control (ASCM) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.

No
Repair is complete.

Please let us know what happens.
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Monday, October 2nd, 2023 AT 9:26 AM
Tiny
BHAMDOC1973
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What does this mean?
"Disconnect all jumper wires and reconnect all previously disconnected components and connectors."
Also, I cannot get.
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Monday, October 2nd, 2023 AT 11:26 AM
Tiny
KEN L
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Jumper wires mean any test wiring that has been used and reconnect all electrical connectors that may have been undone during the repair.
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Tuesday, October 3rd, 2023 AT 10:22 AM
Tiny
BHAMDOC1973
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So, what if there are the same codes I gave you first after the test drive? I did that already first thing when I got it. Deleted codes but they would not delete, test drove it. Same thing.
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Tuesday, October 3rd, 2023 AT 10:27 AM
Tiny
KEN L
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So what have you done so far?
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Wednesday, October 4th, 2023 AT 7:55 AM
Tiny
BHAMDOC1973
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I want to try to power the compressor wire. If am using a probe, does pressing the button sends power or ground to a wire?
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Wednesday, October 4th, 2023 AT 9:04 AM
Tiny
BHAMDOC1973
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There is no power or ground to any of the wires at the compressor, fuses are good. Relay switched with another same results.
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Thursday, October 5th, 2023 AT 7:17 AM
Tiny
KEN L
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Does the pink and lt/grn wire at the air suspension control module have power when the key is on?
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Thursday, October 5th, 2023 AT 8:25 AM
Tiny
BHAMDOC1973
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None have anything.
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Thursday, October 5th, 2023 AT 9:24 AM
Tiny
KEN L
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I forgot to ask you to test for power when the car is running.
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Friday, October 6th, 2023 AT 9:29 AM
Tiny
BHAMDOC1973
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I checked at the compressor, not at the module.
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Friday, October 6th, 2023 AT 9:35 AM
Tiny
KEN L
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Please check the power wire at the module.
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Friday, October 6th, 2023 AT 9:58 AM
Tiny
BHAMDOC1973
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Pink and light green has power with ignition on.
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Saturday, October 7th, 2023 AT 6:40 AM
Tiny
KEN L
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Okay, let's also check the pnk/blk wire at the module for power as well. Please let me know.
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Saturday, October 7th, 2023 AT 8:15 AM
Tiny
BHAMDOC1973
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Pink black is ground with ignition on.
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Saturday, October 7th, 2023 AT 8:29 AM
Tiny
KEN L
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Check fuse #50 in the main fuse panel under the hood.
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Sunday, October 8th, 2023 AT 10:20 AM

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