asigetic Posted June 9, 2011 #1 Posted June 9, 2011 Hi there all I have been working on restoring a 84 Venture for the last 2 months that was in a garage with 26,000 miles for the last 15 years. I tore it down complete to a motor in a frame and have since down all the updates that I have read on the forums and have a issue at this moment. The headlight bulb stays lit all the time in the dash Evan tho the head light works on high and low and also the tail and brake light stays lit in the LCD Evan tho the lights work. Does anybody have a idea where to go to test or has anybody ran across this issue before. Thanks I will have pictures of everything I have done so far posted when I get a internet connection that does not take 24 hours to upload. Thanks in advance. AL
bkuhr Posted June 10, 2011 #3 Posted June 10, 2011 . The headlight bulb stays lit all the time in the dash Evan tho the head light works on high and low I assume you mean the white RLU warning light at the top of the dash. RLU is reserve lighting unit and is indication that the main circuit for the headlight is defective, and headlight is being operated by the RLU. The most likely problem is bad circuit in the CMS(LCD display assembly) . and also the tail and brake light stays lit in the LCD Evan tho the lights work. simular issue here. the tail and brake light circuits run thru wire coils inside the CMS, and appear to be working, the in the middle of these coils are magnetic reed switches that are supposed to activate when the HI/Low/Tail/Brake circuits are turned on. If a circuit is activated, but no current flows (or there is a fault), then the warning light in the LCD turns on. probably need to resolder the CMU :sign yeah that:You will need to pull the dash, remove and resolder the connections on the CMS search for CMS/CMU repair
Flyinfool Posted June 10, 2011 #4 Posted June 10, 2011 Out of curiosity, have you changed any of the lighting to HID or LED. This could cause your symptoms also. But there are fixes.
bongobobny Posted June 10, 2011 #5 Posted June 10, 2011 Try a new headlight. Use a 9003 bulb. The white light means your low beam is burned out and the reserve lighting unit has switched over to the high beam. Could also be the headlight connector...
Venturous Randy Posted June 10, 2011 #6 Posted June 10, 2011 I assume you mean the white RLU warning light at the top of the dash. RLU is reserve lighting unit and is indication that the main circuit for the headlight is defective, and headlight is being operated by the RLU. The most likely problem is bad circuit in the CMS(LCD display assembly) I believe that the white light can indicate the RLU is defective, even if the bulb high/low beams are good. RandyA
dingy Posted June 10, 2011 #7 Posted June 10, 2011 Below is a not brief summary of the reserve lighting unit operation. This is what I have found with the operation of a working system on an 1988 wiring setup. I have just verified this information on my bike. I have independent spade lug terminals hooking up to the headlight plug in the wiring harness,due to my projector headlights, so it is easy to simulate burnt out bulb conditions. The reserve lighting unit is located on the right side of the headlight unit. When the dimmer switch is set to LOW and low beam lamp is not functioning, the reserve unit illuminates the high beam lamp at a reduced voltage, this keeps from blinding oncoming traffic. The dash white indicator light "Headlamp" is illuminated. CMU Headlight icon is displayed. When the dimmer switch is set to LOW and High beam lamp is not functioning. The dash white indicator light "Headlamp" is not illuminated. CMU Headlight icon is displayed. When the dimmer switch is set to HIGH and High beam lamp is not functioning, the reserve unit illuminates the low beam lamp at a near normal voltage. The dash white indicator light "Headlamp" is illuminated. CMU Headlight icon is displayed. The "High beam" indicator is lit. When the dimmer switch is set to HIGH and Low beam lamp is not functioning. The dash white indicator light "Headlamp" is not illuminated. CMU Headlight icon is displayed. The "High beam" indicator is lit. When both lights are not functioning, only the CMU icon is displayed when Low beam is selected. When HIGH beam is selected, the dash white indicator light "Headlamp" is illuminated. CMU Headlight icon is displayed. And the "High beam" indicator is lit. Assuming the wiring diagrams are correct, the high and low beam run through the CMU. There is an input circuit and an output circuit for both the high and low beams. The reserve lighting unit is where the input wire from the headlight fuse goes first. I am guessing that the current on this wire is used to determine if the lamps are lit or not. Last paragraphs are based on this assumption. If the Low beam is selected at the dimmer switch, a positive voltage is sent to the CMU, which then passes that voltage back to the headlamp. If headlamp is burning, reserve lighting unit does nothing. It senses normal current on feed wire, and it is getting voltage on its low side input. If the High beam is selected at the dimmer switch, a positive voltage is sent to the CMU, which then passes that voltage back to the headlamp. If headlamp is NOT burning, reserve lighting unit senses very low current on feed wire (some current consumed in CMU), and it is getting voltage on its low side input. The reserve lighting unit then outputs reduced positive voltage on the High beam circuit, thus illuminating High beam and signaling CMU that low beam filimant is burnt out. If the High beam is selected at the dimmer switch, a positive voltage is sent to the CMU, which then passes that voltage back to the headlamp. If headlamp is lit, reserve lighting unit lights the High beam indicator lamp. It senses normal current on feed wire, and it is getting voltage on its high side input. If it is not lit, the reserve lighting unit outputs positive voltage on the low beam circuit, thus illuminating low beam and signaling CMU that high beam filament is burnt out. Gary
bongobobny Posted June 11, 2011 #8 Posted June 11, 2011 I believe that the white light can indicate the RLU is defective, even if the bulb high/low beams are good. RandyA Agreed, although not that common. I have a spare if you need one...
asigetic Posted June 11, 2011 Author #9 Posted June 11, 2011 (edited) The arrow is pointing to the light I am talking about I replaced the head light bulb and this light stays on always still what should I be looking for. My High and Low beam work as they should and nothing shows up on the the monitor as being burnt out just that annoying light is lit up. Also I assembled the air cleaner box back on and found that the clamps keep sliding up and the seal is broke so I looked on the cheep cycle website and found that there was suppose to be some type of plastic runners inside the rubber boots. Here is a link to there website. http://www.cheapcycleparts.com/model_years/5086-yamaha-1984-xvz12dl/assemblies/154005. Besides the CMU possible being bad looks like I will need the four boots and the plastic runners and clamps for the air housing. If anybody has that because there discontinued. Edited June 11, 2011 by asigetic
Keemez Posted June 11, 2011 #10 Posted June 11, 2011 The (red) warning light in that pic is shown as a result of a fault detected in the tail/brake light circuit (as indicated by the CMU display).
asigetic Posted June 11, 2011 Author #11 Posted June 11, 2011 I know the bulb is burned out for the rear running light I'm trying to figure out why the head light bulb will not go out after I put a factory bulb from Yamaha and it works on bot beams,
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now