Some interior lights & brights not working
05-20-12, 01:42 PM
#1
Some interior lights & brights not working
I need a little help with this one... The lights in the gauge cluster, logicon, and brights are not working. The idiot lights and low beam head lights are working. I have tried a different headlight switch. I have also checked the ILLUM, ROOM, METER, and CIGAR fuses.
Any other ideas? Bad CPU?
Any other ideas? Bad CPU?
Last edited by 87 t-66; 05-20-12 at 02:04 PM.
05-20-12, 05:46 PM
#2
With respect to your high beams you would need to check the wires at the Dimmer Relay. The White wire needs to have a ground on it for the high beams to work so w/the lights on, apply a ground to this White wire and see what happens. If the brights come on then you know the high beam filaments are good, and that the contact in the relay is not stuck, and the relay coil is good as well. If the brights come on w/the grounding of the White wire then remove the ground and measure the voltage on this wire w/the low beams on and compare it to the voltage you get when the low beams are on, but the Dimmer lever activated to turn the brights on as the voltage should drop from high to low on the White wire when this happens.
When you try to turn on the gauge lights does the bulb for the Cigarette Lighter come on as well as the little bulbs in the turn Signal switch, Hazard switch, Wiper and Washer switch and Cruise Control switch?
When you try to turn on the gauge lights does the bulb for the Cigarette Lighter come on as well as the little bulbs in the turn Signal switch, Hazard switch, Wiper and Washer switch and Cruise Control switch?
05-20-12, 06:27 PM
#4
What??????????? I used the S4 wiring diagrams but I believe the circuits involved are the same between the two models. Let me check the S5 diagram to make sure. And does this S4+1 have the air bag or not? If not then the wiring for the Dimmer is the same.
Edit: The Dimmer wiring is the same (if no air bag), but not for the other lighting problem you have, but still check to see if the bulbs in the already mentioned switches work or not.
Edit: The Dimmer wiring is the same (if no air bag), but not for the other lighting problem you have, but still check to see if the bulbs in the already mentioned switches work or not.
05-20-12, 07:22 PM
#7
with the key on:
the rear defroster light comes on with the button pressed.
turning the high beam **** causes the headlights to go up, but not light.
when I move the turn signal switch down, the gauge cluster, logicon, and all switch lights come on normally. (just noticed this)
while this happens the illumination **** does not dim the lights. The brights also do not work.
i think i have an s4 turn signal switch? does that matter?
the rear defroster light comes on with the button pressed.
turning the high beam **** causes the headlights to go up, but not light.
when I move the turn signal switch down, the gauge cluster, logicon, and all switch lights come on normally. (just noticed this)
while this happens the illumination **** does not dim the lights. The brights also do not work.
i think i have an s4 turn signal switch? does that matter?
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05-20-12, 07:30 PM
#8
with the key on:
the rear defroster light comes on with the button pressed.
turning the high beam **** causes the headlights to go up, but not light.
when I move the turn signal switch down, the gauge cluster, logicon, and all switch lights come on normally. (just noticed this)
while this happens the illumination **** does not dim the lights. The brights also do not work.
i think i have an s4 turn signal switch? does that matter?
the rear defroster light comes on with the button pressed.
turning the high beam **** causes the headlights to go up, but not light.
when I move the turn signal switch down, the gauge cluster, logicon, and all switch lights come on normally. (just noticed this)
while this happens the illumination **** does not dim the lights. The brights also do not work.
i think i have an s4 turn signal switch? does that matter?
05-20-12, 09:49 PM
#17
You should jumper two wires between the switch and plug to prove how it should be set up. On an S5 the Red/Yellow wire from the Dimmer Switch connects to the White wire that is part of the Front harness and this wire runs to the Dimmer Relay. So in your case you need to connect this R/Y wire to the opposite end of that plug ( so when you look at the switch, whatever pin of the switch that was connected to the R/Y wire now goes to the opposite end of that plug) then it is now and then jumper the Black ground wire from the switch harness to a ground source and the high beam part of the Dimmer Switch ought to work. If this works then everything is opposite.
05-21-12, 12:03 AM
#18
You should jumper two wires between the switch and plug to prove how it should be set up. On an S5 the Red/Yellow wire from the Dimmer Switch connects to the White wire that is part of the Front harness and this wire runs to the Dimmer Relay. So in your case you need to connect this R/Y wire to the opposite end of that plug ( so when you look at the switch, whatever pin of the switch that was connected to the R/Y wire now goes to the opposite end of that plug) then it is now and then jumper the Black ground wire from the switch harness to a ground source and the high beam part of the Dimmer Switch ought to work. If this works then everything is opposite.
Another thing to look at is when the lever on the switch is pulled back the contact in the switch closes and passes a ground to the Dimmer Relay to work, so what this tells you is if you pull back the lever on the switch to engage the high beams then that would cause continuity to occur between two of the pins on the switch for this has to occur as the lever is pulled back so as to pass the ground from one pin to the pin that connects to the Dimmer Relay. So, in closing, measure for continuity on these two pins and when you find it you know you identified the proper two pins and then you could compare these results to the plug diagrams to truly tell if they were mere opposites of each other. Hope this makes sense.
05-21-12, 08:01 PM
#20
there's got to be something else going on here....
i hooked up a known s5 turn signal switch...
only the low beams come on still.
the dimmer **** doesnt do anything.
none of the gauge cluster, cluster surround, or logicon lights come on.
when i flip the turn signal switch, i hear the relay in the cpu but no lights come on.
the hazard lights dont come on.
the rear defrost light comes on when the button is pressed.
the sunroof opens but the map lights do not work
the wipers work
is it worth mentioning that the car was automatic but i put a manual trans in? also, i removed the cruise control.
i hooked up a known s5 turn signal switch...
only the low beams come on still.
the dimmer **** doesnt do anything.
none of the gauge cluster, cluster surround, or logicon lights come on.
when i flip the turn signal switch, i hear the relay in the cpu but no lights come on.
the hazard lights dont come on.
the rear defrost light comes on when the button is pressed.
the sunroof opens but the map lights do not work
the wipers work
is it worth mentioning that the car was automatic but i put a manual trans in? also, i removed the cruise control.
Last edited by 87 t-66; 05-21-12 at 08:14 PM.
05-21-12, 08:23 PM
#22
i bought the car with no drivetrain, ecu, or EM harness. i swapped in a complete turbo drivetrain and usdm electronics (N370). the EM harness is from a S5 NA. the rest of the wiring (engine, front, body, etc.) harnesses came with the car. it starts up every time, just the lights dont work properly. i think im going to take out the turn signal/headlight sub harness and make sure all of the wire colors match the FSM. maybe someone swapped it out or tampered with it at some point?
05-21-12, 08:43 PM
#23
The high beam problem as stated before could be a Dimmer Relay fault and the way to prove that was already mentioned.
The blinker problem could be the Flasher unit in the CPU. This unit has 7 wires. If you jumper voltage which should be constant on the Black/Blue wire to the Green/Black wire in the same plug, the left turn signal lights and indicator light in the dash should light up and the same goes for the right hand turn signal lights when the voltage is jumpered to the Green/White wire. If these lights work then the problem most likely lies within the Flasher unit. The Hazards and blinkers use the same CPU circuit board.
The blinker problem could be the Flasher unit in the CPU. This unit has 7 wires. If you jumper voltage which should be constant on the Black/Blue wire to the Green/Black wire in the same plug, the left turn signal lights and indicator light in the dash should light up and the same goes for the right hand turn signal lights when the voltage is jumpered to the Green/White wire. If these lights work then the problem most likely lies within the Flasher unit. The Hazards and blinkers use the same CPU circuit board.
05-21-12, 09:15 PM
#24
i cant find my meter at the moment so i probably wont be much help right now...
i did however try 2 spare cpu's and there was no change. i did notice that on the bottom of the cpu, there was only one plug connected. is this correct? i also have a manual trans cluster in the car. i tried both the manual and auto trans gauge cluster harnesses and there was no change.
when i had the s4 turn signal switch in the car, the cluster lights did come on when the lever was flipped.
i did however try 2 spare cpu's and there was no change. i did notice that on the bottom of the cpu, there was only one plug connected. is this correct? i also have a manual trans cluster in the car. i tried both the manual and auto trans gauge cluster harnesses and there was no change.
when i had the s4 turn signal switch in the car, the cluster lights did come on when the lever was flipped.
05-21-12, 09:27 PM
#25
i cant find my meter at the moment so i probably wont be much help right now...
i did however try 2 spare cpu's and there was no change. i did notice that on the bottom of the cpu, there was only one plug connected. is this correct? i also have a manual trans cluster in the car. i tried both the manual and auto trans gauge cluster harnesses and there was no change.
when i had the s4 turn signal switch in the car, the cluster lights did come on when the lever was flipped.
i did however try 2 spare cpu's and there was no change. i did notice that on the bottom of the cpu, there was only one plug connected. is this correct? i also have a manual trans cluster in the car. i tried both the manual and auto trans gauge cluster harnesses and there was no change.
when i had the s4 turn signal switch in the car, the cluster lights did come on when the lever was flipped.