Headlamp wiring

[Liam22]

I am removing the headlamps on the race car (for a couple of reasons) and replacing them with shells and some minimal LED marker lights and indicators. Should be a 6kg+ saving when it's all done.

There's the funny thing where a blown sidelight will permanently illuminate the indicator. I'm seeing something similar with 10V on one terminal, and 3V on another.

But my main problem is that the indicators are going double speed, even when I've wired them up to the LED strip.

I suspect that I need some extra resistance but not sure where. I spent an hour playing trial and error with various resistors but no luck.

Does anyone know what the lighting module expects for each bulb?

 

[Liam22]

In case anyone else needs this.

Headlamp cluster connector (car wiring loom)

.----------.
|      (a) |
|          |
|      (b) |
| (e)      |
|      (c) |
| (f)      |
|      (d) |
| (g)      |
'----------'

    Function           LHS Wires     RHS Wires
    -----------------  ------------  -------------
(a) Sidelight          BLACK/green   BLACK/blue
(b) High beam          WHITE/green   WHITE/blue
(c) Low beam           YELLOW/green  YELLOW/blue
(d) Earth              BROWN         BROWN
(e) Earth              BROWN         BROWN
(f) Indicator (inner)  BLUE/green    BLUE/brown
(g) Indicator (outer)  BLUE/green    BLUE/brown

 

[Scooba_Steve]

Just code out the hot and cold bulb checks along with the cluster warning. Carly or NCS can do it.

 

[Liam22]

Thanks. I did that too

 

[Liam22]

The indicators needed a 100 Ohm resistor to avoid flashing double time.

 

[Scooba_Steve]

The indicators needed a 100 Ohm resistor to avoid flashing double time.

That's odd because turning the checks off should stop the double flash error. So I'd have to conclude the coding wasn't complete.

3 checks to make nicht_aktiv:
KALTUEBERWACHUNG_BLK_VO
WARMUEBERWACHUNG_BLK_VO
CC_BLINKER_VORN

 

[Liam22]

Ah, thanks. I did it with Carly so will double check.

 

[kis]

In case anyone else needs this.

Headlamp cluster connector (car wiring loom)

.----------.
|      (a) |
|          |
|      (b) |
| (e)      |
|      (c) |
| (f)      |
|      (d) |
| (g)      |
'----------'

    Function           LHS Wires     RHS Wires
    -----------------  ------------  -------------
(a) Sidelight          BLACK/green   BLACK/blue
(b) High beam          WHITE/green   WHITE/blue
(c) Low beam           YELLOW/green  YELLOW/blue
(d) Earth              BROWN         BROWN
(e) Earth              BROWN         BROWN
(f) Indicator (inner)  BLUE/green    BLUE/brown
(g) Indicator (outer)  BLUE/green    BLUE/brown

This is cool, but the brown wire normally represents live/positive? With all the other ones as the neutral/negative? Right?

But for bench testing something I guess it doesn’t matters, since bulbs can work fitted either way. But maybe with LED’s you can get caught out?

 

[Liam22]

the brown wire normally represents live/positive?

All BMW earth wires are brown.

 

[kis]

Ahh really? That’s cool, figured some were quite fat so would be power. But that’s super useful! Thanks!