I just got my s40 with 94k miles. I'm leaving in 2 days for a road trip to Baltimore. I'll post a thread about it.

I re-administered the voltage test, using the negative jumper cable wire and connecting that to my voltammeter and negative post of my battery (pictured below). (with the ignition turned to position II) The results are as follows; Pin 2 DCV 79.1 Pins 3 and 4 both .007 ACV with no change when adjusti...

So, I'm reviewing the troubleshooting link you've sent me, thanks for that. That link also took me to another helpful guide for understanding relays. Unfortunately, my computer will not go to the other S40 forum that I was directed to by your link to the related forum on our site, the computer is te...

The negative on my meter won't reach the battery. I'm trying to locate ground straps in my engine compartment.

For the ground, I used a screw that holds the metal step to the door frame. Its pictured above.
No,neither the climate control nor the the indicator lights are working.
Is there a test i can use to see if my ground is good?

TEST RESULTS* 1. With scope in DC Volts mode, on pin 2 you should read 0.00 volts (relative to chassis/ground) you should read 0 on Pin 2 as it is supposed to be grounded at 31/1 via 43/401. Scope modes; DCMA:0.00 DC10A= .000 DCV= Variable; I could not get a constant reading on this setting 2. On Pi...

Thanks for everything, I'm currently ingesting some info.
My climate controls are not working.

* Should my glove box be taken out for proper access to these components? Your help has given me great hope and excitement about this project and broadening my practical knowledge. We spent about 10 hours this weekend fixing stripped wiper arms and getting the wiper timing back in sync, great learni...

* one more note* With the connector removed from the speed CTRL and the jump removed from the connector, I believe the air conditioner is still on, only not blowing. I say that because under my glove box, where we're working, there is cold condensation and the a/c seems to be making sound like it's ...

Thanks for the information and diagram. Here's where I'm at, with my limited understanding and ability to apply the information you've provided. I removed the jumper from the connector and connected it to my speed CTRL, which I (mis ?)understand to be pin 4. The connection is fine but yields no effe...