Anyone know what this silver box is called?

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Old Aug 2, 2021 | 05:13 PM
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Default Anyone know what this silver box is called?

Anyone know what this silver box is called? It's under the dash on the passenger side behind the glove box.

I know it controls the door ajar light and warning buzzer. Whats it called and what else does it control?
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Old Aug 2, 2021 | 05:41 PM
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Default Re: Anyone know what this silver box is called?

I tried googling and searching for it but it's hard to find info on something you don't know what it's called.
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Old Aug 3, 2021 | 04:42 AM
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Default Re: Anyone know what this silver box is called?

What year/model/trim level vehicle? Are you in the USA, or another country?

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Old Aug 3, 2021 | 05:39 AM
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Default Re: Anyone know what this silver box is called?

Sorry I forgot to post specs.

1990 Honda civic hatchback EF STD model from Canada.
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Old Aug 3, 2021 | 06:00 AM
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Default Re: Anyone know what this silver box is called?

Originally Posted by SlowCivicD15
Anyone know what this silver box is called? It's under the dash on the passenger side behind the glove box.

I know it controls the door ajar light and warning buzzer. Whats it called and what else does it control?
controls automatic seat belts and daytime running lights on Canada cars
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Old Aug 3, 2021 | 06:05 AM
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Default Re: Anyone know what this silver box is called?

Originally Posted by jlicrx
controls automatic seat belts and daytime running lights on Canada cars
didn't seem to affect any lights other than the door ajar light on the dash. That was my initial problem. Door ajar light came on no matter how hard I slam the doors. Flickered when I hit bumps. Buddy told me to unplug the silver box and the issue went away.
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Old Aug 3, 2021 | 06:36 AM
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Default Re: Anyone know what this silver box is called?

I thought the door ajar was controlled by the ICU on the back of the under dash fuse box? They like to leak all the electrolytes out of the capacitors and eat the traces on the circuit board. Maybe Canada cars are different with the DRLs.
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Old Aug 3, 2021 | 07:16 AM
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Default Re: Anyone know what this silver box is called?

Thats an AC related controller. I think its just for the fan speed.
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Old Aug 3, 2021 | 08:43 AM
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Default Re: Anyone know what this silver box is called?

Fan speed is usually just a resistor mounted in the top of the blower housing. Not sure on Canadian cars though.
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Old Aug 3, 2021 | 09:52 AM
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Default Re: Anyone know what this silver box is called?

Originally Posted by Full_Tilt
Thats an AC related controller. I think its just for the fan speed.
definitely didn't affect the AC any.
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Old Aug 3, 2021 | 09:58 AM
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Default Re: Anyone know what this silver box is called?

I'm thinking it's like a security feature box. It controlled the door ajar light on the dash for sure. And the seat belts don't lock anymore on a hard brake since I've unplugged it. I still don't know what it's called. I'm guessing it shorted out because of the door ajar issue. I was going to find one online and replace it if I could get a name for the device. I've tried "security feature box 1990 honda civic ef" and "door ajar box 1990 civic ef" and nothing comes up for those searches that look like whatever this silver box is.
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Old Aug 3, 2021 | 11:27 AM
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Default Re: Anyone know what this silver box is called?

Originally Posted by DaX
Fan speed is usually just a resistor mounted in the top of the blower housing. Not sure on Canadian cars though.
Originally Posted by SlowCivicD15
definitely didn't affect the AC any.
Hmm
Maybe I just falsely attributed that because it was mounted to the AC stuff in there
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Old Aug 3, 2021 | 11:41 AM
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Default Re: Anyone know what this silver box is called?

I see it also controlled the seat belts lights on both the dome area and on the dash.
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Old Aug 3, 2021 | 11:57 AM
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Default Re: Anyone know what this silver box is called?

Sounds like @jlicrx had the right answer...
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Old Aug 3, 2021 | 12:55 PM
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Default Re: Anyone know what this silver box is called?

i believe it is 39795-SB2-003 21 RELAY ASSY., POWER (4P) (RC-2201) (MITSUBA)
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Old Aug 3, 2021 | 04:55 PM
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Default Re: Anyone know what this silver box is called?

Originally Posted by jlicrx
i believe it is 39795-SB2-003 21 RELAY ASSY., POWER (4P) (RC-2201) (MITSUBA)
On Canada cars, the Honda part number is 38260-SH3-C01, RELAY ASSY., RUNNING LIGHT (RZ-009 12V) (MITSUBA).
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