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Old 11-08-2010, 10:00 AM
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Join Date: Nov 2004
Location: WV
Posts: 34
'91 4matic, cannot erase codes; turn off light

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I finally had the transfer case in my '91 TE replaced with a used unit. Everything went well until it came time to erase the stored 4Matic codes to turn off the 4Matic light on the dash. I can't seem to read or erase the codes. When I ground pins 1 and 5 the 4Matic light gets brighter then dims when the pins are ungrounded.

After searching the forum I took a flyer and replaced the OVP just in case. One thread mentioned that over a periiod of time the 4matic ecm can lose memory and needs rebooted but I cannot find any info on rebooting the 4matic brain. Anyone one how to do this? Any other thoughts? Thank you.
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