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1994 s10 blazer 4x4 wont engage


SLEBonneville2002
11-07-2006, 10:55 PM
used 4 wd the other day worked fine, went about a mile or so and went to engage it again and it wouldnt go in the lights blink and i hear a clicking noise from the dash and when i try 4wd low both lights come on and it goes into 4wd low any ideas? :banghead:

jred187
11-08-2006, 07:13 AM
On the back of the ECM there is a relay. Replace that and it will work. I had a 94 with the same problem got a new relay and it worked fine.

SLEBonneville2002
11-12-2006, 09:56 PM
found the ecm under the dash. is the relay the white box attached to the back of it?

jred187
11-17-2006, 07:17 PM
No there is a metal relay on the back of the ecm the white plastic piece is a vehicle speed sensor. I had a hard time figuring it out but once I replaced that piece(the metal box type piece)my 4wd worked.

hughes1059
11-17-2006, 11:52 PM
please be sure to let us know if this fixes your problem... im having the same dilema

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