AdamG
Senior Member
- Joined
- May 24, 2009
- Messages
- 531
- Reaction score
- 4
- Location
- Bromley, Kent
- Your Mercedes
- S320CDI (2003)
I was sick of the poor light output from the standard halogen lights fitted to the w220 S320cdi. As soon as I bought the car I wanted to upgrade the lights to bixenon. The problem is some of the key parts are hideously expensive new from Mercedes.
The parts required are:-
• Headlight right A2208202661
• Headlight left A2208202561
• Wiring harness A220540413298
• Light range ECU A2208203685
Everything I sourced from eBay apart from the loom which was about £80 from Mercedes.
It is important to get the right harness variant as LHD cars have the light range ecu under the right footwell.
Disconnect the battery
The harness on the facelift car does not just control the lights. It also connects to the two crash sensors at the front. The first job was to strip the old harness out of the car (this one only connected to the crash sensors) to make room for the new one.
The route of the wires run under the front seats in plastic cable duct. By the left sill are the connection points for the CAN-C high and low, diagnostic line and an earth point. The loom passes through the left engine bay fuse box and to the left light. There is a connector that needs to be inserted into the ESP ecu (pin 3). All the connector pins are already crimped to the wires.
The harness then continues down the left wing connecting to an earth near the fuse box. It also branches off across the engine bay near the wiper motor to the right headlight.
The part of the harness in the car then runs in the duct and up to the centre console. There the crash sensor wires connect to the airbag control unit. The colour code is the same as the old harness. Pin 74 and 80 need to be disconnected from the old harness and reconnected with the new.
The harness continues under the driver’s seat where there is another earth to connect. Then goes through the right fuse box to the right light. There is a fuse holder that plug in to the colour coded connection.
It sounds harder than it is but the harness falls in to place nicely and lines up with connection points. Also there are red bands that help alignment.
The light range ecu screws to the metal plate under the passenger’s footwell.
With the harness all in place the extra plugs can be pushed onto the xenon headlights and the lights bolted in.
Once all back together the car needs to be coded with star. The central gateway has an option for xenons present. Also the light range ecu has the option of long or short wheelbase.
The xenon lights are significantly brighter and should be standard on an s-class.
Sorry for the lack of photos and being a bit oversized! Any question comments please ask.
Adam
The parts required are:-
• Headlight right A2208202661
• Headlight left A2208202561
• Wiring harness A220540413298
• Light range ECU A2208203685
Everything I sourced from eBay apart from the loom which was about £80 from Mercedes.
It is important to get the right harness variant as LHD cars have the light range ecu under the right footwell.
Disconnect the battery
The harness on the facelift car does not just control the lights. It also connects to the two crash sensors at the front. The first job was to strip the old harness out of the car (this one only connected to the crash sensors) to make room for the new one.
The route of the wires run under the front seats in plastic cable duct. By the left sill are the connection points for the CAN-C high and low, diagnostic line and an earth point. The loom passes through the left engine bay fuse box and to the left light. There is a connector that needs to be inserted into the ESP ecu (pin 3). All the connector pins are already crimped to the wires.
The harness then continues down the left wing connecting to an earth near the fuse box. It also branches off across the engine bay near the wiper motor to the right headlight.
The part of the harness in the car then runs in the duct and up to the centre console. There the crash sensor wires connect to the airbag control unit. The colour code is the same as the old harness. Pin 74 and 80 need to be disconnected from the old harness and reconnected with the new.
The harness continues under the driver’s seat where there is another earth to connect. Then goes through the right fuse box to the right light. There is a fuse holder that plug in to the colour coded connection.
It sounds harder than it is but the harness falls in to place nicely and lines up with connection points. Also there are red bands that help alignment.
The light range ecu screws to the metal plate under the passenger’s footwell.
With the harness all in place the extra plugs can be pushed onto the xenon headlights and the lights bolted in.
Once all back together the car needs to be coded with star. The central gateway has an option for xenons present. Also the light range ecu has the option of long or short wheelbase.
The xenon lights are significantly brighter and should be standard on an s-class.
Sorry for the lack of photos and being a bit oversized! Any question comments please ask.
Adam
