Why did 2006 express reverse siren stopped working

There is some help in the link. It is a known issue.

https://www.google.com/search?q=2006+chevy+van+express+stuck+in+first+gear

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The alarm siren has failed. The alarm siren and sunroof module are on the same communication circuit. If you remove the right front wheel fender liner you can unplug the siren module and see if the sunroof begins working normally.

If it does, replace the siren.

There were quite a few of the earlier s80s that had the power wire trapped under the bolts for the survivors and/or dome lamp assy. If you've had anything out interior wise start there first.

run the fault codes and check for torque convertor clutch solenoid/ servo as if this is not operational then nothing works. It is controlled by the TCM module and if it was a sudden occurrence it may be a wiring connection fault or a fuse problem. The problem will have a fault recorded

Your Siren alarm might be faulty. Do you have any error messages on your SID display? The siren alarm located behind the driver side fender. The Siren alarm can be replaced or bypass the unit with a Tech2 scanner. A new Siren alarm is very expensive ($360+) from the dealership. However, you can get your original unit rebuilt through BBA vendor for about $85.00 with life time warranty.

Good luck

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

what did you do to fix silent alarm?

Fuse block under the hood. Driver's side, under the brake master cylinder. Number 18. TCB#2. Replace the fuse.

There is an under-engineered ground in the reverse circuit. If you back up with the dome lights on, it could blow that fuse. There should be some extra fuses under the cover of the fuse block.

i own a 2006 chevy express cutaway box truck the interior box lights are not working and i do not know what fuse designates them can any one help me locate the proper fuse

Yes & No, IF you car has Express Up power windows (where you can press the button once, let it go and the window will continue to go up) some cars have both Express up and down, some have Express down only and some have no express feature. on cars with Express up and down only, yes there is an anti-pinch where if something blocks the path of the window it should stop and reverse back down 4-6 inches. IF you have express up and down you can test the anti-pinch by placing a roll of masking tape in the windows path (not flat but vertical so if the anti-pinch does not work the glass will gentely collaps the roll of tape, also be ready to stop the window) if your anti-pinch is not working, contact your dealership, your local glass shop or post back for anti-pinch reset proceduer.

Hi. Check fuse 38 in the fuse box to the right of the dashboard. It is for the siren. There is a serial communication between the UEM and siren which if communication stops there it will stop power supply to sunroof module. Matt