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2000 chevy blazer interior electronics don't work with out turning on high beams

Chewy420

By Chewy420
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Chewy420 Enthusiast

Chewy420

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Hello, so I've checked all fuses and they all are good, replaced headlight switch and multifunction turn signal switch and still have the problem. Vehicle will start, however none of the interior electronics work, ie cluster, radio, interior lights, etc... Will only work when I pull the high beam switch and hold it, literally everything turns on like there's no problem, but only while high beams are held on. Please help ?

Chewy420 Enthusiast

Chewy420

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7 hours ago, mikedeezxxx said:

These trucks are notorious for bad fuse blocks. That would cause the problems you are having.


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Even if all the fuses are good? 

Jsdirt Senior Enthusiast

Jsdirt

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I'd try a hard reset - might get the stupid out of the BCM.

 

Hard reset = disconnecting the battery, and touching the positive and negative cables together for 30 seconds.

 

If that doesn't work, check all powers & grounds to BCM, any connectors, and the wiring for chafe points. If that all checks out, the BCM is probably done for.

mikedeezxxx Enthusiast

mikedeezxxx

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Even if all the fuses are good? 

It’s usually a broken wire inside the fuse block. Have you tested every fuse for power going in and out? I’m very familiar with this issue in 2006-2009 trailblazer SS’s. Electronics start acting wacky, the usual culprit is the fuse blocks on those.


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Chewy420 Enthusiast

Chewy420

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On 6/15/2019 at 5:23 AM, Jsdirt said:

I'd try a hard reset - might get the stupid out of the BCM.

 

Hard reset = disconnecting the battery, and touching the positive and negative cables together for 30 seconds.

 

If that doesn't work, check all powers & grounds to BCM, any connectors, and the wiring for chafe points. If that all checks out, the BCM is probably done for.

I shall try this, thank you

Chewy420 Enthusiast

Chewy420

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23 hours ago, mikedeezxxx said:


It’s usually a broken wire inside the fuse block. Have you tested every fuse for power going in and out? I’m very familiar with this issue in 2006-2009 trailblazer SS’s. Electronics start acting wacky, the usual culprit is the fuse blocks on those.


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Tested every fuse and all good, so far no broken wires. 

Chewy420 Enthusiast

Chewy420

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On 6/15/2019 at 8:03 AM, silveradosid said:

when you hold the highbeams on are the headlights bright or very dim

I would say that their brightness is normal for high beams

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