What a PIA these things are! Okay, now that I got that off my chest I can get on with this odyssey!!

This seemed to start with the bulb failure light going off. Found burnt-out taillight bulb, replaced, thought I solved problem. Sorry JW, not that easy...

BTW - Cruise control went inop about the same time.

Replaced other tailight bulb. BF sensor still lit up and no cruise either.

Now third (high) brake light bulb goes on and stays on ALL the time. Still no cruise. Pull this bulb, clean housing and replace with new bulb. No change.

Go to local boneyard and get used BF Sensor. Switch with old one. Dreaded BF Sensor light still on. Makes a nice pair of dashboard lights with my check engine light (O2 sensor) Well, it's Christmas after all...

However, cruise is now working. Strange, isn't it? I do know the cruise and the BF Sensor are connected, I read about this in the 700/900 FAQ. So apparently the old one was indeed bad.

My question is what do I do next? Should I take apart all three brake light housings clean thoroughly, tighten connections and then test again? Anything else?


Thanks All,

Jim


--
90 244DL 262k :)

JIM,

I HAD A SIMILAR PROBLEM WITH MY 1993 240. I REPLACED THE BULB SENSOR WITH A NEW (AND EXPENSIVE) SENSOR THAT FIXED THE PROBLEM.
GOOD LUCK AND MERRY CHRISTMAS & HAPPY NEW YEAR.

FRANK

JIM,

I HAD A SIMILAR PROBLEM WITH MY 1993 240. I REPLACED THE BULB SENSOR WITH A NEW (AND EXPENSIVE) SENSOR THAT FIXED THE PROBLEM.
GOOD LUCK AND MERRY CHRISTMAS & HAPPY NEW YEAR.

FRANK

J,

Radio Shack has the same Fuse holder for $3 or so. Closer & cheaper.

Also consider making a water shield out of the side of a plastic oil bottle. Cut a strip 6 in long with 1 1/2 in into the face and back of the bottle and the side being the spine. Cut a notch to allow the relay rail mounting screws clearance and back off the screws and slide it behind the relay rail. Stops the water from getting to the relays and fuse holder (waterproof or not).

When I installed a Volvo cruise control system into my 1988 244, the instructions called for a CC wire to be connected to one side of the brake light switch. It is this connection that drops CC when you touch the brakes.

The non-cruise wires to that switch are just two. A GN-R from Fuse #7, then a BL-R to the BFWS relay. That relay has a separate wire to each of the three brake lights. (Colors for 1988, yours may differ.)

I would think that if the cruise system wire is disconnected from the brake light switch, then the BFWS system would get a fair test. The CC would be disabled. This would be a way to determine if the problem lies in the CC "brain".

Good Luck,

Bob

:>)

Seem to have lost the end of my original subject line.

Hey Thanks, Bob! I'll give disconnecting the CC wire a try. I hadn't considered that possibility. I was thinking along the line of a bad ground, connector, wire etc. in the brake system.

Jim
--
90 244DL 262k :)