99 740iL - Radio/GPS/nav not working - Bimmerfest - BMW Forums

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7 Series - E38 (1995 - 2001)

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Old 07-05-2011, 03:28 PM
99740il 99740il is offline
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Location: san francisco
Join Date: Jul 2011
Posts: 3
Mein Auto: 99 740 il
99 740iL - Radio/GPS/nav not working

Hi Guys,

I have a '99 740iL the radio would randomly come on and shut off. The GPS quit working, so thanks to this forum i started my research to fix my problem. I really wish all of these things were all separate ! oh well !

So after reading and trying my best, here is what I have done.

1. Checked the voltage of the battery, it has been replaced with a new battery. - Didn't fix the issue

2. I pressed the eject button and connected the power simultaneously - Didn't fix the problem.

3. Unplugged the GPS Nav mkII from the car and plugged it back in. Didn't fix the problem.

4. My dad has a 2001 740iL with the same GPS, so i plugged his unit into my car with no luck, I did put my unit into his car and the GPS /radio all work. So my GPS unit is not bad.

So from reading the forums I have a few conclusions,
1. Either my dash display needs to be changed as i do have a few pixels that are bad,
2. Change the ignition as that could be the cause
3. The DSP could be bad. Note: the dsp does not light up on the monitor it is greyed out.

Anything else you guys would recommend? I should try?


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