Re: Bi xenon coding help
Posted: Sun Nov 30, 2025 10:25 pm
Doc
Thanks to forum user @RKDesigns.
You must change long coding in your caddy BCM to enable operation with the Xenon headlights and modules.
Byte 14 check bit 3 Bi-xenon headlights (with shutters) installed
Byte 15 check bit 3 Daytime running lights (DRLs) inactive with turn signals
Byte 15 check bit 6 Daytime running lights (DRL) via separate lights active (This could already be checked)
Byte 17 check bit 2 Bi-xenon with additional high beams
Byte 18 code this to C2 (This is the light config for the new caddy and not in the dropdown list)
Byte 19 bit 4-7 to 00 Turn taillight dimming off if this is not already (Else you get flickering DRL's when the engine is turned on).
Byte 21 uncheck bit 1 (This one is hidden! Original code 6F, now 6D. This bit must be off, else your DRL are not on when the xenon turns on).
Byte 25 check bit 2 High beams with shutters active/installed
From Sero62's post HERE
Byte 24 bit 7 "Daytime Running Lights (DRLs) as position lights active" should be checked for a full brightness DRL.
When I helped forum user @Winst code his lights on his 2C model caddy which he has now facelifted to the Caddy4 front end, I used Byte 18 code 74.
This was on a 5K0-937-087AC BCM and may differ for yours. </quote]
