Turn indicator issues

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Have a problem with the left turn indicators on my 2012 D40.
Right hand side is working fine left hand side I have nothing. Indicator light on the dash flashes fast as if a globe is blown but none of the turn indicators illuminate. Hazard is similar, normal flashing speed and both showing on the dash working but only the right side indicators actually working.
It has 4 indicator lights per side, led in the bullbar, standard headlight and guard mounted lights and rear led. They were working fine until a week ago nothing has been changed.
I have tested all 4 lights individually and they are all OK, if I run a hot wire directly to one of the lights it illuminates along with the other 3.
Obviously not getting power for some reason but has me stumped, thought it may be a fuse or relay but after looking at all 4 fuse boxes I cant find any marked as indicator or hazard. A quick search on line didnt help as it appears the indicators are controlled by the BCM. Disconnected the battery hoping it might reset something but no joy.
Surely the supply to the indicators must be fused but where is it located and what is it called?

Any suggestions?
 

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If you're standing outside the car and you lock the doors with the remote, do the LH indicators work? If yes, it's a possible logic problem in the BCM. If no, check to see if there's a signal coming off pin 47 of the BCM. There should be 3 connectors on the BCM, you want one of the two pins under the locking tab of the long narrow connector. I suspect this will work if the instrument cluster is showing it working, but test it anyway.

The indicators/hazards are controlled by both the BCM and the instrument cluster (according to the manual). In the back of the instrument cluster are two connectors, the long one is the one we're interested in. The second pin from the outside of the meter on the row closest to the locking tab is pin 2, and this should be going positive 12V when the indicators are flashing.
 

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Thanks for the reply, nothing on the LH side when the remote is used.
I am going to go through all the fuse boxes and test each fuse just to make sure it isnt fused and marked as anything else. After that then it will be a matter of checking the BCM.
Not sure if the trailer lights are a separate circuit or part of the indicator circuit, will test it as well.
Would be simple to bridge from them if it is separate for a temp solution.
 

Old.Tony

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Usually the trailer lights are fed power from the harness providing power to the rear lights. If the trailer lights were working and the LH car lights weren't, then I'd suspect a ground problem for the LH lights. Ground is fed by the BCM, it might be an idea to see if the indicators are getting a valid ground. I don't know if the indicators "flip" the positive and negative like headlights sometimes do, but it wouldn't be difficult to test that. If there's no flip - if the indicators always have the tip of the globe as positive and the surround as negative - testing that the earth is poor is just a matter of connecting the globe's surround to the body (or battery negative). If that solves the problem, there could be a break in the harness somewhere or there's a bad earth for one of the components. If your stereo's earth - which the instrument cluster shares - isn't good, then this could cause all sorts of instrumentation issues. The solution for that is just add an earth from the body (a bolt under the dash) to the frame of the stereo.

It's not an easy one, they're trying to get clever with power delivery to the lights. Rather than just send a positive 12V when the globe has to come on, they send both (probably to ensure that the light is actually working).
 

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I guess it is a possibility but given they also arent working with the hazard switch or remote probably not.
Went through all the fuses this morning and found nothing, trailer plug is the same everything working but the left indicator. I think I located the pin on the BCM, pin beside it pulses with the right indicators, the one I think is the left has nothing.
Not sure how to access the dash without pulling the entire thing apart it might be time for a visit to the local auto elec and see what they can find.
 

Old.Tony

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I'd suggest if the pin on the BCM isn't firing that the BCM has a fault.

Pin 47 (one of the pair in the area below the locking tab) is the LEFT indicator. Pin 48 (one pin out from the locking tab) is the RIGHT indicator. That should help you nail pin 47.
 

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