Electronics gone haywire.

35

Asked by Jun 14, 2017 at 02:55 PM about the 2001 BMW 7 Series 740iL RWD

Question type: Maintenance & Repair

Recharged dead battery, now the outside temp indicator says it's minus 39 and the A/C doesn't work.

8 Answers

83,115

Did you use a high amp charger or reverse polarity?

1 of 1 people found this helpful.
35

No reverse polarity for sure. The charger I used is mostly automatic, but it has a reconditioning setting and I think it uses a higher amp output. I used this setting after the first attempt to recharge the battery only produced an 11 volt charge.

1 of 1 people found this helpful.
83,115

I would check your fuses and hope that the problem is just a bad fuse.

1 of 1 people found this helpful.
35

I will check them now and get back to you

83,115

Low battery voltage could cause things not to work or work properly. 11 volts is very low.

35

I checked the fuses under the hood (pass. side) and in the trunk above the battery. All good. ??? What else do I need to check?

35

After the reconditioning process I had 13.1 volts, started it up and found the other problems.

35

It has now worked itself out and my best guess is as follows: I discovered the dead battery on my way out of town, so it was left in dead state for over a week or more. After recharging the battery, the climate control had reset reset itself to a below -0* setting thereby eliminating the need for A/C. I drove around while watching the climate control numbers count down to 0* then after a minute up to the correct temp and the A/C started working. ( It was just the Climate Control)

Your Answer

7 Series

Looking for a Used 7 Series in your area?

CarGurus has 193 nationwide 7 Series listings starting at $5,995.

Postal Code:

BMW 7 Series Experts

  • #1
    lweems
    Reputation
    1,760
  • #2
    Tom Demyan
    Reputation
    610
  • #3
    Vince Lee
    Reputation
    580
View All

Related Models For Sale

Used Mercedes-Benz S-Class
8 Great Deals out of 125 listings starting at $2,988
Used BMW 5 Series
35 Great Deals out of 671 listings starting at $2,949
Used Audi A8
39 listings starting at $14,950
Used Chevrolet Corvette
558 listings starting at $4,450
Used BMW 3 Series
165 Great Deals out of 1,931 listings starting at $2,500
Used Mercedes-Benz E-Class
32 Great Deals out of 539 listings starting at $4,500
Used BMW M3
4 Great Deals out of 111 listings starting at $15,990
Used Cadillac Escalade
4 Great Deals out of 489 listings starting at $4,980
Used BMW X5
51 Great Deals out of 897 listings starting at $4,980

Used Cars For Sale

2018 BMW 7 Series For Sale
43 listings starting at $128,988
2017 BMW 7 Series For Sale
4 listings starting at $109,900
2016 BMW 7 Series For Sale
3 Great Deals out of 17 listings starting at $82,900
2015 BMW 7 Series For Sale
6 listings starting at $59,251
2014 BMW 7 Series For Sale
3 Great Deals out of 16 listings starting at $42,549

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.