Cannot manually turn on rear interior light on 156
So, as the title says, when I open the doors all the lights illuminate, as they probably should, but I cannot turn them on when I'm driving for example. What could be the problem? Sometimes one of them does start working randomly...
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Yeah, I have to pull the headlining off (again!) anyway. It's wrong for the year and a bit tatty...
Anyway, this is what eLearn has to say:
Since the part with the integrated services control unit works I'm assuming I have to get an earth on one of the pins which should be easy enough? The wiring runs pretty close to where I was grinding the floor due to rust around one of the flaps so it is possible I've disturbed something there...
Anyway, this is what eLearn has to say:
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Since the part with the integrated services control unit works I'm assuming I have to get an earth on one of the pins which should be easy enough? The wiring runs pretty close to where I was grinding the floor due to rust around one of the flaps so it is possible I've disturbed something there...
Well, got the headlining off so I tried fixing the lights but I'm thoroughly confused now.
I measured the input with multimeter and it seems to be like this
![Automotive lighting Font Gas Jewellery Rectangle]()
![Automotive lighting Gas Nickel Metal Circle]()
That would mean the switch inside the light should switch between left and right connection so that when the door is closed it would switch to the right earth and light up! But when I measured the resistance there only seems to be a connection between middle and left or nothing at all. I also removed the switch and same thing. There is never any connection between middle and right pin!
![Finger Electrical wiring Cable Thumb Engineering]()
Are all my switches bad? I would appreciate if someone with working lights or some more knowledge can help me clarify this
I measured the input with multimeter and it seems to be like this
That would mean the switch inside the light should switch between left and right connection so that when the door is closed it would switch to the right earth and light up! But when I measured the resistance there only seems to be a connection between middle and left or nothing at all. I also removed the switch and same thing. There is never any connection between middle and right pin!
Are all my switches bad? I would appreciate if someone with working lights or some more knowledge can help me clarify this
Actually the permanent earth works fine. There is always 12V between middle and right terminal, there is just never a connection between the two in the lamp, that's why I suspect the switch inside the lamp. If the lamp was to light up with the doors open when the left terminal gets 12V that would mean the permanent earth would have to be the middle (common) terminal. Which is not... Left terminal actually becomes earth and when it deactivates it's likely an open circuit.
Position for the doors open light
![Finger Thumb Nail Wrist Creative arts]()
This should then be the path to light up during driving...
![Finger Gesture Thumb Wrist Jewellery]()
If I bridge the terminals it works...
![Automotive lighting Lamp Street light Headlamp Light bulb]()
![Body jewelry Silver Jewellery Nickel Oval]()
But that would mean not one of the switches out of the five I've tested, works...
Position for the doors open light
This should then be the path to light up during driving...
If I bridge the terminals it works...
But that would mean not one of the switches out of the five I've tested, works...
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