rear dvd not working

[HUMTECH]

you could try this
#07-08-44-016A: GM Accessories Headrest DVD System Display Monitor Inoperative (Install Cable Connector Clamps) - (Aug 28, 2007)

Subject:GM Accessories Headrest DVD System Display Monitor Inoperative (Install Cable Connector Clamps)

Models:2004-2007 Buick Rainier
2008 Buick Enclave
2003-2008 Cadillac Escalade Models
2005-2008 Cadillac CTS, SRX, STS
2006-2008 Cadillac DTS
2003-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer Models
2006-2008 Chevrolet Colorado
2007-2008 Chevrolet Equinox, HHR
2003-2008 GMC Envoy Models, Sierra, Yukon Models
2006-2008 GMC Canyon
2007-2008 GMC Acadia
2007-2008 Pontiac Torrent
2005-2008 HUMMER H2
2006-2008 HUMMER H3
2007-2008 Saturn OUTLOOK
2005-2008 Saab 9-7X

This bulletin is being revised to update the models affected list. Please discard Corporate Bulletin Number 07-08-44-016 (Section 08 -- Body & Accessories).
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2007042&from=sm#ss1-2007042">Condition

Some customers may comment on an inoperative display monitor or monitors in the GM Accessories Headrest DVD System.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2007042&from=sm#ss2-2007042">Cause

This condition may be caused by a loose connection at the display monitor cable connectors. These connectors are located at the lower rear part of both front seats. Two cables are routed to the display monitor in each seat.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2007042&from=sm#ss3-2007042">Correction

Do This
Don't Do This
Install display monitor cable connector clamps.
Do Not replace the DVD system display monitor.
Important: A number of headrest monitors have been replaced under warranty and in many cases, no trouble was found by the supplier when these units were analyzed. Therefore, technicians should be checking for loose connections and installing cable connector clamps to ensure a positive and robust connection.
Technicians are to install a video cable connector clamp on each cable connector located under each front seat. A total of four cable connector clamps, P/N 19159659, are required for each vehicle.



The illustration above shows a pair of display monitor cable connectors without the cable clamps installed.



The illustration above shows the display monitor cable connectors with the cable connector clamps. The lower cable connector clamp is installed but not locked together. The upper cable connector clamp is closed and locked.
The cable connector clamps have now been added as a permanent component to all GM Accessories Headrest DVD Systems installation kits.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2007042&from=sm#ss4-2007042">Parts Information

A total of four clamps are required for each vehicle.
Part Number
Description
Qty
19159659
Clamp, DVD Cable Connector
4