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7 Series - E38 (1995 - 2001)

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  #1  
Old 12-08-2012, 10:37 PM
bmw2qnj2le bmw2qnj2le is offline
BMW740i
Location: TEXAS
 
Join Date: Jan 2012
Posts: 27
Mein Auto: 740i
Arrow 2001 740i. LOST Multifunction display

2001 740i. New with the E38/740i car.
I lose my NAV/Radio/Multifunction display after disconnecting my battery for replacing the oil cover gasket.
When I reconnected the battery back, my display was blank. I called for help. Helper is not familiar with BMW. I could not started my car b/c I set the security code. After reading the manual, I could start my car again but still no display. Radio only works for ~3 min then stops.
1. Any thing I can do to bring back the multifunction display back? (the back light does work)
2. Do I need to take to dealer to fix it? or just any simple fuse or reset somewhere in the car that I could do?

Any help is greatly appreciated. Many thanks in advance.

bmw2qnj2le
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  #2  
Old 12-11-2012, 03:58 AM
JasonSC540ia JasonSC540ia is offline
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Location: Alamogetto NM
 
Join Date: Aug 2009
Posts: 672
Mein Auto: 1999 740i
Try disconnecting your batt again. Leave it disco'd for about 20mins or so. When you disco the batt make sure you disco the negitive...not the positive. Reconnect and report back.
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  #3  
Old 12-13-2012, 12:03 AM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,271
Mein Auto: E23;E30;E38;E32;E34 +
Also try both terminal disconnect and joint them (NOT THE BATTERY TERMINALS) together. Resets a lot of stuff and might be a quick fix.
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  #4  
Old 12-24-2012, 07:17 PM
bmw2qnj2le bmw2qnj2le is offline
BMW740i
Location: TEXAS
 
Join Date: Jan 2012
Posts: 27
Mein Auto: 740i
Today 24 Dec 2012, I disconnect both positive and negative terminals and check the 2 fuses (27 & 47). They are not blown. I check them with an ohmmeter. After terminals are connected, the mutli function display is still blank! The back light is on because I check when the outside is dark. Does the multi function display device have its own fuse? the radio only plays for 2-3 mins then stops but I can change stations. It does hinder the operation of the car. The nav system and 6 cd charger in the trunk do work. Any help is greatly appreciated.
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