Bad 4wd switch or something else??
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Bad 4wd switch or something else?? - 5/27/2008 5:47:27 PM
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ZLover4Life
Posts: 17
Joined: 2/16/2008
Status: online
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I bought my 99 Blazer in January, and the 4WD system had intermittent problems at the time - occasionally, if it was in 4WD, the switch would blink at me, it'd change to 2WD, and the "Service 4WD" light would come on. Since then, the problem has increased in frequency. Usually, the problem would go away if I restared the car. It is now at the point where the 4WD system does not work at all.
I happened upon a thread in the DIY forum...
http://www.blazerforum.com/m_152088/tm.htm
... and used my multimeter to test the switch, in the hopes that it'd be something that simple and cheap to fix. But my results have me unsure.
According to step 4, resistance should be as follows:
Normal - 9.09K ohms
2 Hi - 1.82K ohms
Auto 4WD - 64.9 ohms
4 Hi - 715 ohms
4 Lo - 3.16K ohms
My switch tested as follows:
normal - 9.09k ohms
2 Hi - 1.516K ohms
Auto 4WD - 64.9 ohms
4 Hi - 662 ohms
4 Lo - 2.33k ohms
So the only two selections that gave acceptable reading are normal and Auto 4WD. Normally, I'd figure the switch is the source of my problems, but I'm left with a question. If Auto 4WD is giving the correct reading, why isn't it working? It gives me the same problems that 4 Hi gives (I have yet to use 4 Lo) - it blinks at me, activates the light on the dash, and switches back to 2 Hi.
Can anyone provide insight? I'll probably replace the switch regardless (since the other readings were out of spec), but I don't want to be surprised if replacing the switch doesn't solve all my 4WD problems. By the way, the Blazer only has about 51K miles on it (and I got it from my friend's grandparents), so I will be truly surprised and disappointed if the 4WD system is shot.
< Message edited by ZLover4Life -- 5/27/2008 6:01:56 PM >
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1999 Blazer LT
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RE: Bad 4wd switch or something else?? - 5/27/2008 5:52:41 PM
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Sorell
Posts: 99
Joined: 5/3/2006
Status: offline
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I had pretty well the exact same problem, don't know where the thread is at though... either way I took it to the dealership and they replaced the Transfer Case Control Module, haven't had a problem with it since
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2001 Blazer 2dr 4x4 LS
31x10.5, Roof Rack
Calgary, AB
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