XJS Headlights won't flash
#21
Carsnplanes, thanks for your very detailed explanation. So it sounds that the piece I was missing is that the flash switch is not really the flash switch, it is the dip/main switch that also has a flash function. By the way, I looked at the schematics in a 1990 service manual and it shows a circuit similar to that detailed at the very top of this thread, not the simpler one. I think the Hella device shown in the photo is in fact the headlamp control module shown in that original diagram. So going back to the OP problem, terminal 81a (blue/black) should be grounded by the flash function in the stalk which should then trigger the module to connect the 12v on terminal 30 straight through to terminal 56a (blue/white) high beam output.
Newer cars (92 -96)use a module with a "flip/Flop circuitry where a momentary pull is high, another pull is back to low. This happens in a rectangular black box mounted on the left side inner wheel arch. The headlight main switch is on a small three position switch on the stalk itself. The module type wiring is on the first wire diagram in this post.
#22
Actually your first statement is not entirely true. Early cars that used the on dash rotary headlight switch do not use a "module" that are used on the later cars. The early cars for which we were troubleshooting used a rotary headlight switch where it would pass the 12 V power through it to the lamps rather than control a heavier relay to to do the work. The wire diagram shows this by path described where 12volts works it way through the ON switch to the normally relaxed Hi beam/Low beam relay. This is the same metal relay shown in the red car photo. The only way this relay is energized is with HI beam stalk movement, either momentary towards you or detent away from you. So the job of the early stalks was for HI beam action by energizing the relay for hi beams and low beams when relay is relaxed.
Newer cars (92 -96)use a module with a "flip/Flop circuitry where a momentary pull is high, another pull is back to low. This happens in a rectangular black box mounted on the left side inner wheel arch. The headlight main switch is on a small three position switch on the stalk itself. The module type wiring is on the first wire diagram in this post.
Newer cars (92 -96)use a module with a "flip/Flop circuitry where a momentary pull is high, another pull is back to low. This happens in a rectangular black box mounted on the left side inner wheel arch. The headlight main switch is on a small three position switch on the stalk itself. The module type wiring is on the first wire diagram in this post.
#23
With Main switch ON, 12V power now comes from the switched on "headlight relay" and enters the module and allows the transistor logic flip/flop action of the stalk to control hi beam /low beams that way.
#24
#25
I'd agree with that as my own headlight module in my '95, can be intermittent. It will be on normal beams and if I toggle to Hi beams and back to Low, I lose the lights completely on Low. HI works, but I have to work at it to bring the Low or normal, back on. Somebody on this forum has taken the black module box apart and either cleaned up the contacts or re- flowed the solder joints with good results, which I will also do.
#26
#27
Which relay type did you have that you repaired, the older metal relay shown in the red car or the later Lo/Hi toggle type black plastic module.
#30
#31
I'd agree with that as my own headlight module in my '95, can be intermittent. It will be on normal beams and if I toggle to Hi beams and back to Low, I lose the lights completely on Low. HI works, but I have to work at it to bring the Low or normal, back on. Somebody on this forum has taken the black module box apart and either cleaned up the contacts or re- flowed the solder joints with good results, which I will also do.
#32
First of all apologies for taking an age to do this. I took off the metal relay, and accidentally dropped it. I took it apart and the top bit that covers the coil has broken off so I've bought a new black plastic one which was quite awkward to fit - there is not much room to squeeze those five contacts in and hey presto the daylight flash now works! Only trouble is the offside outer headlight now does not work on main beam - maybe that's another thread for another day. Cheers all.
#33
First of all apologies for taking an age to do this. I took off the metal relay, and accidentally dropped it. I took it apart and the top bit that covers the coil has broken off so I've bought a new black plastic one which was quite awkward to fit - there is not much room to squeeze those five contacts in and hey presto the daylight flash now works! Only trouble is the offside outer headlight now does not work on main beam - maybe that's another thread for another day. Cheers all.
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StevieYonder (03-25-2019)
#34
#35
So, your "offside outer headlight now does not work on main beam"...could still be fuse #4 or yes, low element of the outer lamp, which means the whole lamp. Check the plug/connector to the lamp first after confirming the fuse is good.
If my offside/onside is all off, then just reverse my description.
#36
Offside ( driver side) outer headlamp is now working on main beam - it was a connecting issue where the wire joins into the plastic connector which itself connects to the bulb. When i moved the connector, the light came on. I think the loose connection is where the light bulb connects to the connector rather than the wire as the voltmeter always had a reading when applied to the connector.
Carsnplanes you are a star.
The car has passed it's MOT - it's been quite a journey. It looks like a flying saucer from the rear because the springs I bought were too long but that is another story for another thread.
Carsnplanes you are a star.
The car has passed it's MOT - it's been quite a journey. It looks like a flying saucer from the rear because the springs I bought were too long but that is another story for another thread.
#37
Offside ( driver side) outer headlamp is now working on main beam - it was a connecting issue where the wire joins into the plastic connector which itself connects to the bulb. When i moved the connector, the light came on. I think the loose connection is where the light bulb connects to the connector rather than the wire as the voltmeter always had a reading when applied to the connector.
Carsnplanes you are a star.
The car has passed it's MOT - it's been quite a journey. It looks like a flying saucer from the rear because the springs I bought were too long but that is another story for another thread.
Carsnplanes you are a star.
The car has passed it's MOT - it's been quite a journey. It looks like a flying saucer from the rear because the springs I bought were too long but that is another story for another thread.
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