89 325i tach problem but its not si batteries - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 02-02-2009, 05:06 PM
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89 325i tach problem but its not si batteries

my car sat for awhile got it running and no tach. read all the other posts and changed out the si batteries. that fixed the obc but still no tach. i tried to trace the contacts and the traces on the pcb all seems intact. does it sound like ive got a bad cluster(the si board and or the cluster board)? is there anything else i could check? any ideas are welcome. thanks!
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#2 (permalink) Old 02-03-2009, 09:43 AM
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does your odo work? when my speed pickup sensor in my diff got disconnected on my 325e my tach stopped working as well. check the connector make sure its still connected and not corroded.

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#3 (permalink) Old 02-03-2009, 12:27 PM
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no my odo is not working. so there is something connected to the differential thata effects my tach? ok ill check on that. thanks.
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#4 (permalink) Old 02-03-2009, 12:39 PM
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Yea its connect at the rear of the diff normal top right, looking from the rear but may be different on your model, you cant really miss it as it has wires from it, also it may not be the sensor but a broken wire or loose connection.

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#5 (permalink) Old 02-03-2009, 08:07 PM
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well i checked the sensor at the diff and it seems to be intact. wiring looks good. my odom, tach, and my fuel level gauge are all not working. damn. new batteries, obc working. temp gauge working. speedo working. i dont know.
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#6 (permalink) Old 02-10-2009, 11:41 AM
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Try to clean contact behind dash board with contact cleaner spry,that helps to me
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