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And that's the mystery. None of the three bulbs have blown, power is detected from the fuse to the brake light switch, the switch works, power is detected in the conductor from the switch to the BSI (Built-in System Interface) which should then feed power to the bulbs. Why it doesn't appear to do that is my query.
I realised last night that I have no rear brake lights operating.
After checking the obvious - that all three bulbs have not blown simultaneously - I have today checked the fuse in the under bonnet box, checked there is an electrical supply to the brake light switch, checked the switch, and checked that there is onwards supply to the conductor that leads on to the systems interface unit. From there I'm lost. Has anyone experienced a similar 'fail'.
Thanks
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