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Registered
Join Date: Dec 2008
Location: new jersey
Posts: 27
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Brake Pad warning light will stay lit
Hi, I got a 1982 928 USA 5 speed that has a problem that the brake pad warning light will not go out. I have checked the sensors, they are all in tact. I checked them with a multimeter they are good. I checked the wires to make sure the suspesion hasn't broken connection. All looks good. Where can i find the wires inside by the fusebox?? Thanks in abvance. I love this forum , Happy New Year ALL,....Regards, Erwin
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01-03-2011, 08:30 AM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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you should do more investigation one of the sensors is probably broken .
To test disconnect the sensor and bridge the connector do one wheel at a time, I suggest to start in the back as these sensors see a lot less service. the sensor string is one long loop one break will trigger the light
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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01-03-2011, 09:29 AM
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Registered
Join Date: Jun 2009
Location: Austin, TX
Posts: 70
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check the WSM. The wiring diagram shows which connectors at the CE panel goes to which sensor. On my 79, I think it was Q for one front, and U for both rears. If you get continuity at both of those, then check the other front to ground.
One front sensor only has one connection into the CE panel, so you can check it to ground. The other front has both wires back to the CE panel. And the rears have a wire from CE to pas sensor, wire across to driver sensor, wire back to CE panel. I have a recent post on RL where I found my problem this way.
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Tim White '89 S4 A/T, Blue Int Kaschmirbeige '78 5spd, Cork Int - Featured in High Heels & Hot Wheels 2010 calendar!! Petrol Blue '79 EURO 5spd, Black & brown Pasha Int |
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01-03-2011, 09:43 AM
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Registered
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Central Warning Unit -
Hey erwin928, I have found that it helps to sort out a warning light issue if you begin by making sure that your Central Warning Unit is working properly. Since you are chasing down a brake pad warning light - first jumper Pin 19 and 20 of the SW output plug on the CWU. This will simulate a complete external brake pad sensing loop and the brake pad warning light should be out. The CWU is located under the small boxed panel beside the driver’s left foot.
Once the correct operation of the CWU has been verified - it is a simple matter to determine which of the individual brake pad circuits is bad. You will probably find that as various brands of brake pads were installed over the years, one or more of the connections that make up the series loop (out of and then back into the CWU) has been poorly connected, jumpered, spliced or twisted together. Good Luck, Michael 
Last edited by JK McDonald; 01-03-2011 at 04:59 PM.. |
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01-03-2011, 03:05 PM
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