The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Cruise Control & Brake Lights 700

posted by  werick on  Mon Sep 5 08:13 CST 2005
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Sun Mar 6 08:25 CST 2011
[RELATED]

Hi Guys

I've always had a good operating Cruise Control on my 760 Turbo Diesel. I don't use it often because most of my driving is local. I recently took a trip to Pa. When I went to engauge cruise, NOTHING.

I started to do some troubleshooting when I got home. Vacuum Pump, Module, Brake Pedal switch, Wiring all good, So what gives? I'm a pretty good Electrician but this has me stumped!

Then I remember an old post on this board. Stating that if the brake lights are out, the cruise won't work. Ah ha! About 6 months ago I replaced the brake light bulbs with these new fangled LED Units. And since then I haven't used cruise.

Well here's the catch. The Cruise Control Module is using the Brake Light filaments as a path to ground. Through the switch on the Brake pedal. The original lamps are very low resistance devices, so the module sees ground. The LED bulbs are much higher resistance devices so the module never sees ground and thinks the brake pedal is depressed, so no cruise.

Thank god for that old post on the Brickboard. The wiring diagram confired it. I'm writing this so no one else will waste half a Saturday, chasing their tail on this. Stay away from the LED bulbs, if you want Cruise Control!!!






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.