How do you remove it for testing? Reluctant to cut open the harness if not necessary.

 

Whats the problem that makes you suspect it ?

 

If you want to test the diode without removing it, do it from the bulb holder. Remove the bulbs and check for continuity from the bulb holder to the switch with a multimeter. You should get a low ohms reading one direction and a high ohms reading in the other with the probes switched around.

 

Trunk lights come on very rarely, "Boot Open" message extremely rare. Micro switch test OK, bulbs good, FOBs will not program. There is something strange in the trunk light circuit which is an input to the Security and Locking module. Has me baffled.

 

I get 3.2 ohms either way.

 

Did you remove both bulbs before testing? 3.2 ohms isn't correct. I think you are going to have to get to the diode and test or replace.

 

Pilled the diode. 622 ohms one way, no circuit the other way.

 

Diode is OK, bench tested the switch OK. Give up, do not need trunk lights anyway. Tape the diode back to the harness, reassemble interior linings tighten up the latch bolts and ......the lights come on! Off again now but the culprit has to be the switch which I ordered last week.