AO Platinum Member
Join Date: Aug 2003
Location: London, England
The circuit for the dipped beam headlamps is operated by the steering column switch unit H5 .
By placing the switch in the dipped beam position, the line which supplies the headlamps F10 (left) and F11 (right) is supplied controlled by the ignition. Each circuit is protected by a fuse for the junction unit B1 : F5 for the left headlamp and F4 for the right one.
With the dipped beam headlamps on, this supply passes through the dipped beam headlamps maintenance relay/remote control switch J45 .
If the lights are switched from dipped to main beam, the supply is interrupted, but it is replaced by the one from pin 87 of switch J45 : the signal for switching on the main beam headlamps, in effect, energizes the relay (pin 86) which switches the supply to the direct line (maxifuse J/B2 of B5 to 2/99 or B99 from 2/99) which thereby also keeps the circuit for the dipped headlamps and the main beam headlamps on.
The supply line for the left lamp also acts as a go ahead signal for the headlamp alignment ( See E3080 HEADLAMP AGLINMENT CORRECTOR ) and the rear fog lamps (check device inside the rev counter module E15) ( See E2031 REAR FOG LAMPS )."
OK, so although the current to the dip beam isn't switched by that relay, it does pass through it.
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