Looking for 2012 5.3 liter E38 Connector Pin Out

[dave w]

Attached is the .ctz I modified to get the engine / trans running in the 2009 Wrangler.

dave w

[Munchies]

Caleditor is a great resource to keep him around. I think he means well, and maybe I am just toughened from years of forum banter and BS (especially P4x4!), or the USAF but its hard for me to get butt hurt over words, or being called wrong.

[dave w]

Attached is the schematic I'm using for the radiator dual fan system. I'm bench testing without the E38 computer doing the PWM control.

The results.
Grounding the D-BL/WH (dark blue with white stripe) wire turns on the Right Cooling Fan Only.
Grounding both the D-GN (Dark Green) and D-BL/WH (dark blue with white stripe) turns on both Left and Right Cooling Fans.
Grounding the D-GN (Dark Green) only does NOT turn on either Cooling Fan.

This seems correct to me. Am I correct?

What I think is supposed to happen ~ the E38 computer will turn on the right fan on with PWM control for both low / high speeds? When the AC is requested, and / or the CTS reaches a setpoint the E38 computer will turn the left fan and the right fan at high speed?

The good news, using a fully charged car battery and car cooling fans, I did not blow a fuse or blow a diode. I'm thinking I must have the wiring done correctly.

dave w

[pmkls1]

Dave,

I BELIEVE that you are correct about how the ECM controls the fans and that is why your wiring and test results support your theory. That was how I understood the system to work going by the schematic and my memory. I did have a concern about you being able to find diodes that were rated to support the current that the system carries, but your initial test results indicate that the diodes you are using are adequate. Congrats on your success so far and the pics of your wiring look good ! Those diodes in your pics look like the ones I recall seeing more prominently than the A/C system diodes I dug out of my toolbox. Notice that on top of the diodes you have they have the symbol for a diode on them and the pics I posted earlier had a 1.0 on the top of them. I have a drawer dedicated to relays and fuses that I stripped from fuse blocks that I replaced (which happens quite often) and was sure that I had one. But, I could only find the A/C diodes.

[1project2many]

I looked at the posted wiring diagram. The diodes appear to conduct current back through the motor as it winds down after the relays open and stop supplying power.

[dave w]

I looked at the posted wiring diagram. The diodes appear to conduct current back through the motor as it winds down after the relays open and stop supplying power.

I was thinking the diodes were for spark suppression when the relays open. I agree the cooling fan motors provide a path to bleed off excess current / spark.

dave w

[brian617]

I was thinking the diodes were for spark suppression when the relays open. I agree the cooling fan motors provide a path to bleed off excess current / spark.

dave w

Thats how interpret the diagram as well. The diodes are wired similar to an AC clutch. The windings in the fan motor would reverse a voltage surge back towards the relay causing bad things.