Trunk lights won't come on but very rarely, extremely rare "Boot Open" message. Ordered new micro switch and pulled the old one which tested fine but when I plug it back into the car, no lights, no message? Lights have power, bulbs are good. Something else is blocking the circuit? Any ideas?

 

Also cannot program the Fobs, all started around the same time. Security and locking module?

 

The trunk switch is shown as an input to the Security and Locking module. I assume it is under the trunk fuse box? Faulty connection, broken wire? Any ideas on how to trace it? The switch is fine but not grounded through the module.

 

Yes. The SCLM is under the fuse box.

I think it's time to remove the shelves in the trunk over spare tire, over battery and the panel that covers the locking mechanism (jg classic parts has replacement push clips for super cheap for the panel) and unbolt the fuse box. SCLM is clipped in under the fuse box case. Have a look around.

The SCLM is easy to open. See if it's gotten chalky inside. I'll have to go and look at the ED to be of any more use,,, but I ain't super excited to do that, 😂

The problem is there, somewhere. Check the state of the ground posts just over the battery as well.

 

Checked everything and could find no fault. Gave up, taped the diode back to the harness, put the liners back in and tightened up the latch bolts and VOILA! THE LIGHTS CAME ON! Has to be the switch which I ordered last week.

 

Replaced the micro switch, all is good. Accidentally touched the "Valet" button. The only way to get it out of "Valet" mode was to disconnect the battery. Opened the trunk with the key and "chirp", valet mode off! The switch is an input to the SLM and now all the little gremlins have been solved!!