Bad BCM? - Antique Automobile Club of America Discussion Forums

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#507259 - 05/04/08 02:29 AM Re: Bad BCM? [Re: D-a-n-i-e-l]
D-a-n-i-e-l D-a-n-i-e-l Member Registered: 12/02/06 Posts: 378 Loc: Fort Lewis WA/Iraq	wyane were are you at? _________________________
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#507406 - 05/04/08 09:55 PM Re: Bad BCM? [Re: D-a-n-i-e-l]
D-a-n-i-e-l D-a-n-i-e-l Member Registered: 12/02/06 Posts: 378 Loc: Fort Lewis WA/Iraq	OK here it goes. Disconnect the head light switch, the headlight door switch, pull the high/low relay, disconnect the headlight door module (found under the relay center) and BCM 1)Mesure resistance of the yellow wire from in back of the switch to the yellow wire on BCM, then to the yellow wire on the headlight door module, and to the yellow wire on the high/low relay.(all should be close to 0 ohms) 2) mesure yellow wire at the headlight switch to yellow with black stripe at the headlight door switch. Measure this in both directions: ie swith your multimeter leads for this is a diode and wire check. (should measure high risistance/ohms or almost open in one direction and low or almost no resistance in the other) 3) Measure the yellow wire at the headlight switch to ground. (it should measure infinate ohms or open) If every thing thus far is checking out you have no wiring issues. 4) Reconnect the head light switch. Press the high and low buttons, nothing should happen and the yellow wire should not get hot. (if not your switch is bad) 5)connet the BCM and turn on and off the hi and low lights. the ICP should show hallogen lighs on along with high low beam off annd on. If the yellow wire heats up your BCM is bad. 6)Reconnect headlight door module. Turn high/low lights on and off. If the yellow wire heats up the problem is likely the module, but that is not the only option and we will go over that later if the issue is in this part of the cicuit. 7)reconnect the hi/low relay, turn high/low lights on. If the yellow wire heats up your have a bad relay. 8)Reconnect the headlight door switch and turn on lights. If the yellow wire heats up there is an issue with the switch or wire prior to the headlight door switch. 9) Replace found deffective part and go on your marry way. Let me know what the issue was and if you find it. _________________________
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#507413 - 05/04/08 10:12 PM Re: Bad BCM? [Re: D-a-n-i-e-l]
wayne2reattas wayne2reattas Member Registered: 04/29/08 Posts: 19	First of all I would like to thank everyone for all the feedback! I did everything mentioned with NO luck! So , I called around to a few automotive electrical repair garages. The first was eager for me business UNTIL I said it was a Reatta. He then told me he wasn't interested. I called another garage which was recommended to me. He was willing to give me any info I needed but did not want to work on the car. It ended up being the dimmer switch causing all the problems. Wiring only got hot after the high beams were on for a couple minutes. I just put the dimmer switch in this afternoon-so far things appear to be fine. Once again thanks for all the feedback! It was GREATLY appreciated.
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#507414 - 05/04/08 10:14 PM Re: Bad BCM? [Re: wayne2reattas]
D-a-n-i-e-l D-a-n-i-e-l Member Registered: 12/02/06 Posts: 378 Loc: Fort Lewis WA/Iraq	That makes sense the BCM grounds the relay throught the dimmer switch, but I di not think it was seperate from the headlight switch. Glad to hear it is fixed. _________________________
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#507419 - 05/04/08 10:20 PM Re: Bad BCM? [Re: wayne2reattas]
wayne2reattas wayne2reattas Member Registered: 04/29/08 Posts: 19	Daniel- Thanks for all the info. I replaced the dimmer switch and things seem to be o.k. If not I am going to go through your list step by step! I live in Pittsburgh , Pa. Thanks again for doing the research! I do appreciate all the help I can get! I have a 88 which I have spent the last 6 months getting right. A couple weeks ago I bought a 89. So I guess I will go through all the issues again. Shouldn't be as bad the second time around. Especially with the help here and Jim Finn an e-mail away for the parts I need.
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#507549 - 05/05/08 01:07 PM Re: Bad BCM? [Re: wayne2reattas]
Drake Drake Member Registered: 02/19/08 Posts: 32 Loc: Oswego, Illinois	Wayne, is the dimmer switch you replaced part of the turn signal lever assembly? _________________________ Drake 1989 Reatta White/Blue BCA #43649
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#507616 - 05/05/08 06:04 PM Re: Bad BCM? [Re: Drake]
wayne2reattas wayne2reattas Member Registered: 04/29/08 Posts: 19	Drake , Not sure if it was or not. I am out of town right now. My son did it the other night. Will let you know as soon as I can find out.
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#507848 - 05/06/08 05:44 PM Re: Bad BCM? [Re: wayne2reattas]
wayne2reattas wayne2reattas Member Registered: 04/29/08 Posts: 19	Drake, He said it was down on the steering column.
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#507870 - 05/06/08 07:31 PM Re: Bad BCM? [Re: wayne2reattas]
Drake Drake Member Registered: 02/19/08 Posts: 32 Loc: Oswego, Illinois	Wayne, thank you! _________________________ Drake 1989 Reatta White/Blue BCA #43649
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