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1999 Blazer - "Service 4WD" light on

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Old 11-29-2004, 08:08 AM   #1
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99 Blazer - "Service 4WD" light on

Hi All,

My "Service 4WD" light has come on. Currently, when I turn the ignition switch on, there is no clicking in the passenger side kick panel and the 4WD switch lights on the dashboard barely flash for a nano-second and go off completely as I'm turning the ignition on. A GM mechanic ran the diagnostics and said it indicated an intermittent ground and that it could be a loose ground somewhere or a motor on the transfer case could be bad.

Anyone have any ideas as to go about finding the problem?


Thanks.

Last edited by phil_debol; 11-29-2004 at 04:55 PM.
Old 12-04-2004, 05:59 PM   #2
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Re: 1999 Blazer - "Service 4WD" light on

So...when the truck is running the light it off?
Old 01-10-2005, 09:40 AM   #3
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Re: 1999 Blazer - "Service 4WD" light on

Quote: Originally Posted by Jimmy-James
So...when the truck is running the light it off?
Yes, all 4wd lights are off, but the service 4wd light is on. I have the 4 button switch. I replaced the transfer case motor but it didn't fix the problem. The vacuum is working, pulling the accuator in and out. The control relay box is not clicking when I turn the ignition switch on. The 4wd lights should come on and the relay should click when I turn the ignition on. But nothing is happening right now.
Old 01-10-2005, 09:41 AM   #4
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Re: 1999 Blazer - "Service 4WD" light on

bump
Old 01-10-2005, 08:54 PM   #5
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Re: 1999 Blazer - "Service 4WD" light on

Sounds like the control box is dead.
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