How to test rear ride height sensor

Tiny
JOHNEHN
  • MEMBER
  • 2007 CADILLAC ESCALADE ESV
  • 6.2L
  • V8
  • AWD
  • AUTOMATIC
  • 140,000 MILES
Brought in the car to the dealer ship to have a electronic control module calibrated to my vehicle. Installed but the computer would not communicate with the level sensors came back with error codes for each of the four level sensors. I have tested the sensors power pin in the three pin connector going to the sensors. Three had five volts At the connector the other 0.00 volts traced the wire back to the control module to find no issues with the wire. Tested the wire for five volts directly at the 47 pin harness connected to the electronic control module and still 0.00 volts. I am now getting concerned that the electronic control module may have an internal malfunction that was not caught by the dealership. They had mentioned that maybe one of the sensors has failed causing it not to send the five volts down the wire to the height level sensor. Is there any way to test the height level sensor to see if it needs to be replaced?
Thanks
Wednesday, October 4th, 2017 AT 2:35 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Yep that is what it sounds like, a bad module. Just for fun though lets check all system and related fuses.

Here is a guide and some diagrams to help us get started:

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

Check fuse # 2, 10, 54 and 61.

Please let us know what happens and upload pictures or videos of the problem.

Cheers, Ken
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Friday, October 6th, 2017 AT 11:46 AM

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