Cargo Light not working (2015 CX-5)

[Kedis82ZE8]

Looks like it is PN: KD45-67-5Y0G and it is also used on the Mazda 3 and 6.

I see some used ones on eBay for less than $50

New around $121.
https://www.oemvehicleparts.com/oem-parts/mazda-body-control-module-kd45675y0g

https://www.parts-sale.jp/index.php?route=product/search&search=KD45-67-5Y0G

 

[Chris_Top_Her]

the inside of the plastic switch melted on my rear light... since the switch physically moves the bulb to make contact with the metal and turn it on, my rear light no longer works. I'm going to get some LED, and do some splicing to wire my own lighting solution in. I'll probably try to use the OEM light switch solution so I can maintain the on/off function.

 

[sergeyv]

It doesnt physically move the bulb but the positive terminal in the switch assembly. Black plastic switch goes in between the positive and the light assembly when its off

 

[sergeyv]

Same symptoms and fix was to replace the RBCM. Only the cargo light didn't work.

Did you have to bring it to the dealer to get it reprogrammed?

 

[sergeyv]

When replacing the RBCM with a second hand one, if it comes from mazda 3 or 6 which has same part number as stated by Mazda parts, you can program the new module as-built or read/write. If performing read/write, the manual is saying to store data from old RBCM and the new RBCM doesn't have any configuration stored on it so you just write the stored data on the new one. What about when you replace it with a second hand one, does it overwrite the data or you have to erase the old data first?

 

[Kedis82ZE8]

Sorry... not sure. Mine failed under warranty and was replaced at the dealer.

 

[Tonynyam]

Great thread. Just experienced the issue after swapping my cargo compartment bulb without disconnecting the battery or the bulb assembly. I replaced the MOSFET Q15 on the RBCM and all was back to normal.

 

[theblooms]

Thanks for this thread! This is awesome info for sure!

 

[Jmaz]

Great thread. Just experienced the issue after swapping my cargo compartment bulb without disconnecting the battery or the bulb assembly. I replaced the MOSFET Q15 on the RBCM and all was back to normal.

Thanks for the info. If my RBCM ever goes out I'll look for that MOSFET.

 

[Kedis82ZE8]

Another thread on another forum about this

Caution when replacing trunk light!

I tried replacing my terrible trunk light with a strip of LEDs, since this light is switched through the Rear Body Control Module (RBCM), I fried a transistor (MOSFET) inside of it by overpowering the circuit. The symptom of a failed transistor is that the trunk light just stays on all the time...

www.mazda6club.com

I believe this is what was used

2SK3065 Datasheet by Rohm Semiconductor | Digi-Key Electronics

View datasheets for 2SK3065 by Rohm Semiconductor and other related components here.

www.digikey.co.il

 

[Mazdiod2]

It's a little hard to see because of all the char. Is it a smd?

 

[theblooms]

Another thread on another forum about this

Caution when replacing trunk light!

I tried replacing my terrible trunk light with a strip of LEDs, since this light is switched through the Rear Body Control Module (RBCM), I fried a transistor (MOSFET) inside of it by overpowering the circuit. The symptom of a failed transistor is that the trunk light just stays on all the time...

www.mazda6club.com

I believe this is what was used

2SK3065 Datasheet by Rohm Semiconductor | Digi-Key Electronics

View datasheets for 2SK3065 by Rohm Semiconductor and other related components here.

www.digikey.co.il

View attachment 306760

MINT!!!!

I just ordered 5 Fets from Digi-Key. Maybe my light will work when I open my hatch again!

 

[theblooms]

It's a little hard to see because of all the char. Is it a smd?

Yes, SMD.

 

[Cothmo]

Sorry for reviving an old thread. Does anyone know what component is on C27?
Managed to replace the MOSFET but knocked component c27 offed.

 

[yrwei52]

Sorry for reviving an old thread. Does anyone know what component is on C27?
Managed to replace the MOSFET but knocked component c27 offed.

C27 is a “C”apacitor. You need to read the tiny numbers on the package to know the value. It’s hard to damage this type of the capacitor. Can you just solder it back if the capacitor itself didn’t get damaged?

 

[Cothmo]

C27 is a “C”apacitor. You need to read the tiny numbers on the package to know the value. It’s hard to damage this type of the capacitor. Can you just solder it back if the capacitor itself didn’t get damaged?

Ahhh. I can't find the knocked off capacitor so I am looking to see if anyone know what the capacitor value is. Looking to replace it

 

[zain56]

Hey there,
I apologize for posting in this old thread. I tried changing a bad trunk light bulb and now it doesnt work. I read the things to look for in the rear BCM. But didn't see any burnt MOSFET. I am attaching image of the BCM. If someone can kindly guide me which MOSFET I need to check?

 

[Kedis82ZE8]

@zain56 Model year?

Picture above shows MOSFET. A full picture of your board would be helpful

 

[zain56]

@zain56 Model year?

Picture above shows MOSFET. A full picture of your board would be helpful

Mine is 2014 Mazda6. I was able to order the mosfet. But need to find someone who does this kind of work. Not good with soldering.