2003 Rear Access Light ?? HELP !!!!

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2003 Rear Access Light ?? HELP !!!! - 7/18/2006 11:13:31 AM    Conehead   Posts: 1 Joined: 7/18/2006 Status: offline OK, I'll try to keep this as short as possible. The "rear access open" on my 2003 tahoe dash will come on at any time. (with the hatch closed). Sometimes it stays on 10 minutes, sometimes 2 days. Problem is, at 2 am in the morning when the light comes on, the computer thinks the door is open and sets the alarm off. The 3 switches that trigger the "rear access open" are built into the two latches on the bottom of the door and the 1 latch on the rear window glass. I have trouble shoot this by disconnecting them and hooking one up at a time, hoping I could pinpoint it and replace the faulty one. Problem is it doesn't matter which one I try it still happens. As a last resort, I unplugged all three and it still happens. To make matters worse, you can manually lock the doors and not set the alarm, but there is no manual lock on the hatch. So everytime the truck is locked I have to worry about the alarm sounding. I have already been through the dealer and GM custermer service. Hopefully someone else has seen this problem. A scan will not pick it up as no trouble code is lite. Thanks for any ideas < Message edited by Conehead -- 7/18/2006 11:14:59 AM > Post #: 1

RE: 2003 Rear Access Light ?? HELP !!!! - 6/11/2008 6:20:56 PM    chuck0858   Posts: 4 Joined: 6/11/2008 Status: offline I have the same problem and my neighbors are starting to give me dirty looks every morming because of it.....   PLEASE HELP!!!!!! (in reply to Conehead) Post #: 2

RE: 2003 Rear Access Light ?? HELP !!!! - 6/11/2008 7:28:29 PM    in2pro Posts: 287 Joined: 4/20/2008 From: Austin, Texas Status: online make sure any electrical contact points are clean (in reply to chuck0858) Post #: 3

RE: 2003 Rear Access Light ?? HELP !!!! - 6/13/2008 11:29:02 AM    islandmike   Posts: 1 Joined: 6/13/2008 Status: offline I too have the "Rear Access Door Open" message whenever I start the vehicle, and the temp is above 50 degrees. No alarm system in this Z71. The rear wiper is inoperative when this occurs. I replaced both of the lift gate latches, no luck there.  I took it to the local dealership and they checked the wiring/contacts from the two lift gate latches to the BCM and found nothing wrong. They drag tested the BCM contacts and said they were OK.  They cleaned all the contacts and that was fine for about a week and it happened again,etc.  The dealership said the next step was to replace the BCM , but I hope to someday stumble upon the answer, rather then buying a new BCM. In  my case I am leaning to something loose or dirty in the contacts/attachment of the BCM ,or in the connector above the lift gate, since the event seems to be triggered by a temp change. (in reply to in2pro) Post #: 4

RE: 2003 Rear Access Light ?? HELP !!!! - 6/13/2008 7:39:33 PM    73shark Posts: 2207 Joined: 4/17/2006 Status: online Welcome to the Tahoe forum.  Let us know if you discover the source of the problem. _____________________________ GM perf. exh, GM CAI, Superchips, Lund step tubes, billet grill, LED tails, Lloyd mats, rear console, GM flaps, silver calipers, black bow ties, tint (in reply to islandmike) Post #: 5

RE: 2003 Rear Access Light ?? HELP !!!! - 6/15/2008 2:21:53 PM    chuck0858   Posts: 4 Joined: 6/11/2008 Status: offline Good news,so far..... As a last ditch effort,I disconected the battery before leaving for work on Friday.Thought reseting the computer might help.I hooked it back up when I got home(about 12 hours later)and havent had the problem since.I''m keeping my fingers crossed because it''s only been two days.The only drawback is that the truck ran bad (low idle speed) for the first few minutes after reconecting the battery.Sure is alot better than the alarm going off at 3:00a.m. I''ll keep everyone informed over the next few weeks. (in reply to 73shark) Post #: 6

RE: 2003 Rear Access Light ?? HELP !!!! - 6/15/2008 10:02:49 PM    73shark Posts: 2207 Joined: 4/17/2006 Status: online Slow idle probably due to computer relearning. Still think Bill Gates had some input to the Chevy software.  _____________________________ GM perf. exh, GM CAI, Superchips, Lund step tubes, billet grill, LED tails, Lloyd mats, rear console, GM flaps, silver calipers, black bow ties, tint (in reply to chuck0858) Post #: 7

RE: 2003 Rear Access Light ?? HELP !!!! - 6/16/2008 7:54:19 AM    in2pro Posts: 287 Joined: 4/20/2008 From: Austin, Texas Status: online That brings up a point to check is the battery, if its getting low it could cause the anomalies < Message edited by in2pro -- 6/16/2008 7:55:41 AM > (in reply to chuck0858) Post #: 8

RE: 2003 Rear Access Light ?? HELP !!!! - 6/16/2008 8:12:09 PM    chuck0858   Posts: 4 Joined: 6/11/2008 Status: offline O well,no luck on disconnecting the battery.The alarm went off again today about 5:30 pm.I dont think in my case the battery would be the problem,it''s only about one year old and the truck dosent turn over slow or anything.Guess I''ll keep looking,Thanks guys...... (in reply to in2pro) Post #: 9

RE: 2003 Rear Access Light ?? HELP !!!! - 6/30/2008 7:07:16 PM    chuck0858   Posts: 4 Joined: 6/11/2008 Status: offline Wanted to let everyone know,I brought the Hoe to the dealer.They kept it for two days and told me there was nothing wrong with it.Thirty minutes after bringing it home,the alarm was going off again.once I shut off the alarm and started the the engine the info center kept reading that the rear access was open.The following morning I brought it back to the dealer and showed them.A service tech came out and made sure the rear door was closed all the way.When he looked inside and saw that it still read that the door was open he said,"It needs a new B.C.M.". I''m guessing this is a common problem,seems like he had dealt with it before.Sure enough they changed the body control module and the problem is gone. Too bad it cost $620.00. Anyway,thanks for the suggestions........ (in reply to chuck0858) Post #: 10

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