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07-11-2012, 05:07 PM | #1 |
Registered User
Join Date: Jul 2012
Location: Havana, Florida
Posts: 3
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RWAL / Brake / Cruise Wiring Problems ?
Hello all,
Glad to find such a great site with like-minded individuals. I hope to be of help to others in the near future but unfortunately require some expertise with something that has me at a standstill (we all love these moments don't we). Any and all help would be greatly appreciated. vehicle specs - 1990 GMC Suburban 1500 4wd SLE - 170,000 miles (stock as far as I know - bought it used from an elderly gentleman) I have followed several troubleshoot scenarios from the forum which have been great but include no mention of problems where I am stuck. original problems - cruise inop and brake light on over 35 mph - code 10 (purchased vehicle this way thinking small repair - 1- tested RWAL module 6 wire harness terminals A-C (battery voltage) terminals A-F (no voltage - key on) 2- tested brake switch with vacuum attachment (switch mounted towards passenger side) pink/black stripe (battery voltage - key on - no pedal) purple (battery voltage- key on - no pedal) 3- began chasing purple wire through harness up behind gauge cluster where it runs into a grey plastic 6 wire box with circuit board inside - upon inspection found board is damaged on the brake switch 12 volt side but find no mention of it in any schematic I have found online. pins on housing A- purple - 12 volt comes from brake switch with vacuum attachment B- purple/black stripe - continues in harness towards floorboard C- purple/white stripe - continues in harness towards passenger side of dash D- tan/white stripe - continues in harness towards floorboard E- tan/black stripe - continues in harness towards passenger side of dash F- tan/white stripe - feeds to instrument cluster connector I know the board needs to be replaced but have not been able to locate a part number or how to troubleshoot the other wires attached to it so as not to damage the new one or something else. Sorry for the long explanation - just wanted to include as much info as possible. Thank you in advance to any who choose to help out. -Dani- |
07-12-2012, 06:19 AM | #2 |
Registered User
Join Date: Nov 2007
Location: Lincoln NE
Posts: 513
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Re: RWAL / Brake / Cruise Wiring Problems ?
i would see if you can solder a jumper across the broken trace and test it
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Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=511830 |
07-12-2012, 05:06 PM | #3 |
Registered User
Join Date: Jul 2012
Location: Havana, Florida
Posts: 3
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Re: RWAL / Brake / Cruise Wiring Problems ?
tobiahr -
Thanks for the thought and I will definitely try that as a test once I have made sure there is not some other problem that made it fail. I don't want to cause further damage to it or something else in the wiring without knowing what it is (part# would be ideal for proper replacement) and how it should operate (for troubleshoot purposes) However, until such time I will just have to try and fight my way through. |
07-12-2012, 09:58 PM | #4 |
Registered User
Join Date: Jul 2012
Location: Havana, Florida
Posts: 3
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Re: RWAL / Brake / Cruise Wiring Problems ?
Update
I had some spare time and decided to go another round with the wiring. I will try to keep the progress updated so that others may use for reference. pins on housing A- purple - 12 volt comes from brake switch with vacuum attachment B- purple/black stripe - continues in harness towards floorboard C- purple/white stripe - runs to Torque Converter Clutch Solenoid D- tan/white stripe - runs to Parking Brake Assembly E- tan/black stripe - continues in harness towards passenger side of dash F- tan/white stripe - feeds to instrument cluster connector just chasing down wiring for now |
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