99' S70 interior light problem, how to troubleshoot?

Post by **850 LPT** » 19 Sep 2019, 11:18

Hello everyone,

Most of the time the interior lights in my S70 don't come on when I open the driver door, or the passenger door for that matter.
This, of course, is happening with the overhead switch in the center position. So because of this I leave them turned off so the battery doesn't drain.

However, the other day I tried it out again while sitting in the car and I turned the switch to the center position, and the lights came on

. I think in this case they shouldn't though because I didn't open any doors.

Does anybody know what could be wrong?

The PO must have wrestled with this before, because the foot well lights were removed when I got the car.

Thanks for any ideas you might have.

Dirk

Post by **E Showell** » 19 Sep 2019, 11:22

Steve's the resident expert on this.

Post by **850 LPT** » 19 Sep 2019, 12:48

Thanks Evan. The repair will be a snap then.

Post by **abscate** » 19 Sep 2019, 13:07

Trade it in for a Honda

There is a long winded thread about troubleshooting my 1999 S70 with this and its a b****

My car is fine as long as the ignition has not been energized in a while , like hours, but the minute T30 gets 12 Volts my lights latch on and stay on regardless of door position.

BY the way.,, when I went to get keys made and coded to the VIN, I could not get it done as I was told one of the lock modules won't go inactive - a requirement for new keys

Post by **Goupil** » 19 Sep 2019, 13:16

Couldn't it be just the microswitch in one of the door mechanism getting stuck ? And then somehow got unstuck so the lights stays on while the doors are closed

viewtopic.php?f=1&t=75954

Post by **abscate** » 19 Sep 2019, 13:36

Five page thread on this here

viewtopic.php?f=1&t=88623&hilit=1999+S70NA

you may want to look at the electrical diagram on the first page and run away as fast as you can.

Post by **E Showell** » 19 Sep 2019, 14:39

Steve -- I changed the driver front door on that car, but I believe you have the old door. To the extent a "lock module" is associated with a particular door, harvesting the module from the old driver's door and swapping over may solve your key programming issue.

Post by **850 LPT** » 19 Sep 2019, 15:38

You have got to be kidding me.....

I just read through Steve's post, and I feel totally defeated already. Since I'm not nearly as smart as Steve I think I am just going to give up.

And buy a Honda.

Post by **abscate** » 20 Sep 2019, 03:13

E Showell wrote: ↑19 Sep 2019, 14:39 Steve -- I changed the driver front door on that car, but I believe you have the old door. To the extent a "lock module" is associated with a particular door, harvesting the module from the old driver's door and swapping over may solve your key programming issue.

My problem, and I think Dirks , are both logic fail related. I bet he sees the same behavior ido, that electrically cold modules work fine , but something is latching on incorrectly when powered up.

One test for a hyperactive module is if the antenna ring stays illuminated after shut down, that's a telltale.

I think I could get a rocket to the moon with all the parts in this system.

Post by **wizechatmgr** » 22 Sep 2019, 23:22

abscate wrote: ↑20 Sep 2019, 03:13
E Showell wrote: ↑19 Sep 2019, 14:39 Steve -- I changed the driver front door on that car, but I believe you have the old door. To the extent a "lock module" is associated with a particular door, harvesting the module from the old driver's door and swapping over may solve your key programming issue.
My problem, and I think Dirks , are both logic fail related. I bet he sees the same behavior ido, that electrically cold modules work fine , but something is latching on incorrectly when powered up.

One test for a hyperactive module is if the antenna ring stays illuminated after shut down, that's a telltale.

I think I could get a rocket to the moon with all the parts in this system.

Merely the moon? I think you could likely make it to Mars and back...