graeme86
Veteran Member
I have been doing some wiring projects and have found various factory relays that can be used (if you want to go OEM style), that of course are designed and tested to be used in the car environment. These all plug into the standard VW relay boxes
First up we have:
Relay "79" - 191 927 841
Bora boot release; also solar sunroof on Passat.
Same as the famous generic "Bosch" relay with switching output between 87 and 87A terminals.
Secondly we have:
Relay "381" - 431 951 253 G
Passat foglight relay
This relay has an internal diode included between terminal 86 and 85 (relay coil) circuit to prevent voltage feedback (and clicking noise). Note: Passat foglight relay is wired differently to the Golf in the vehicle.
Thirdly (this is the best one I found ):
Relay "434" - 1C0 941 597
Right hand drive New Beetle flasher /dipper "relay" (only fitted on RHD New Beetle and RHD Audi TTs)
This relay can be used to convert a momentary switch pulse into a constant output from the relay. i.e this is a latching relay
e.g. you could use, say, the VW interior light switch out of a taxi (with the momentary action) to run something like footlights, as many people do.
You press the momentary action dash switch once and the relay will lock on and feed the relay output with constant power. You press the switch again and the relay will disengage, turning off the power.
There is also another input to the relay that will also disengage the relay if the supply is cut.i.e. the relay will also unlatch if this supply is cut (so you cannot accidently leave the accessory on if you leave the vehicle)
This could be used, for example, wired to 86s key sensor circuit, so that your new accessory switches off when the key is removed, even if you have left your switched accessory "on".
If you wire the relay to the CCM output T23/20, then the accessory will turn off when the CCM goes into sleep mode. This is the supply that controls the luggage compartment light, for example, that switches it off after an hour or so, if you leave the hatch open.
Pins are labelled:
2/30 - required voltage supply to accessory e.g usually battery 30 power
4/31 - earth
5/56 - This is where the feed wire goes that is required to keep the relay latched when you push the switch - if this supply is interrupted the relay will unlatch and the accessory will turn off.
6/LU - the pulsed input- this is the connection from your momentary switches output
8/56a - this is the constant output to your accessory - when the relay is engaged power flows from Pin 2 to Pin 8
Just a background to this relay which may help to explain how it functions.
I had a Right Hand drive (of course! ) TDi New Beetle loaner from the dealer and when I went to use the high beam lever on the steering column you could not push the stalk towards the dash at all - you can only pull it towards you. (I believe that on your LHD versions you can "pull to flash" and push to lock on high beam...same as Golf...so consequently no separate relay on LHD New Beetles)
I am thinking they have just done this as the stalk is very close to the centre of the dash on the right hand drive - the stalk is still on the left side of the wheel.
I discovered that there is a special changeover relay for highbeam for RHD only New Beetles.(It is not actually a relay as such but a proper electronic control unit but with the standard relay pinouts)
If you pull the stalk towards the wheel with the low beams on, then it actually switches over to high beam and you have to pull the flasher lever again to go back to low beam (i.e. you cannot just "flash" high beam - it locks on).
This was the same on the old aircooled beetles (if you ever had one!).
Also once you switch off the engine, the relay reverts to the low beam. (so the hi-beam doesn't just stay latched on - which the old aircooled beetles used to do - if you turned the lights on a week later for example and it was it high beam position it came back on.)
One other point to note is that when the lights are turned off (say during daytime driving) you can flash the highbeam by pulling back on the stalk and it will just flash (it will not stay locked in the highbeam position). However, when doing the same at night it stays in the high beam position and must be flicked again to turn it back off.
Hence the labelling on the relay pins 5/56 is a connection to the headlight switch - if the light switch is not on then the flasher relay did not lock "on" - as I have tried to explain above. Also, when the ignition is turned off, the headlight switch terminal 56 also loses power and cuts power to the latched relay, resetting it (so the high beam is not on next time you switch on the lights)
Here is a schematic of how it is wired in the New Beetles- easier to visualise - very easy to adapt to other functions:
As you can see this relay may have some useful applications for those factory momentary switches such as the "Taxi interior light" and "Gas" switches, if you want to convert them to on/off switch function.
Late breaking news, just found this one:
Touareg Voltage Monitoring Relay for Multi Media System J813 - Part number 7L9 919 433
"The multimedia system is switched off by the voltage monitoring relay whenever the voltage falls below 10.7 V. The multimedia system is switched off by the voltage monitoring relay after about 20 minutes if the ignition is switched off and the multimedia system is switched on. Both measures are intended to protect the vehicle battery from being discharged and to prevent malfunctions to the multimedia system due to undervoltage".
Looks pretty simple to wire up -
30 - Battery voltage
15 -Ignition signal
31 - Earth
and just an output supply voltage to your monitored accessory.
Could be useful for something!
Hope some of the above information may be useful for someones projects.
First up we have:
Relay "79" - 191 927 841
Bora boot release; also solar sunroof on Passat.
Same as the famous generic "Bosch" relay with switching output between 87 and 87A terminals.
Secondly we have:
Relay "381" - 431 951 253 G
Passat foglight relay
This relay has an internal diode included between terminal 86 and 85 (relay coil) circuit to prevent voltage feedback (and clicking noise). Note: Passat foglight relay is wired differently to the Golf in the vehicle.
Thirdly (this is the best one I found ):
Relay "434" - 1C0 941 597
Right hand drive New Beetle flasher /dipper "relay" (only fitted on RHD New Beetle and RHD Audi TTs)
This relay can be used to convert a momentary switch pulse into a constant output from the relay. i.e this is a latching relay
e.g. you could use, say, the VW interior light switch out of a taxi (with the momentary action) to run something like footlights, as many people do.
You press the momentary action dash switch once and the relay will lock on and feed the relay output with constant power. You press the switch again and the relay will disengage, turning off the power.
There is also another input to the relay that will also disengage the relay if the supply is cut.i.e. the relay will also unlatch if this supply is cut (so you cannot accidently leave the accessory on if you leave the vehicle)
This could be used, for example, wired to 86s key sensor circuit, so that your new accessory switches off when the key is removed, even if you have left your switched accessory "on".
If you wire the relay to the CCM output T23/20, then the accessory will turn off when the CCM goes into sleep mode. This is the supply that controls the luggage compartment light, for example, that switches it off after an hour or so, if you leave the hatch open.
Pins are labelled:
2/30 - required voltage supply to accessory e.g usually battery 30 power
4/31 - earth
5/56 - This is where the feed wire goes that is required to keep the relay latched when you push the switch - if this supply is interrupted the relay will unlatch and the accessory will turn off.
6/LU - the pulsed input- this is the connection from your momentary switches output
8/56a - this is the constant output to your accessory - when the relay is engaged power flows from Pin 2 to Pin 8
Just a background to this relay which may help to explain how it functions.
I had a Right Hand drive (of course! ) TDi New Beetle loaner from the dealer and when I went to use the high beam lever on the steering column you could not push the stalk towards the dash at all - you can only pull it towards you. (I believe that on your LHD versions you can "pull to flash" and push to lock on high beam...same as Golf...so consequently no separate relay on LHD New Beetles)
I am thinking they have just done this as the stalk is very close to the centre of the dash on the right hand drive - the stalk is still on the left side of the wheel.
I discovered that there is a special changeover relay for highbeam for RHD only New Beetles.(It is not actually a relay as such but a proper electronic control unit but with the standard relay pinouts)
If you pull the stalk towards the wheel with the low beams on, then it actually switches over to high beam and you have to pull the flasher lever again to go back to low beam (i.e. you cannot just "flash" high beam - it locks on).
This was the same on the old aircooled beetles (if you ever had one!).
Also once you switch off the engine, the relay reverts to the low beam. (so the hi-beam doesn't just stay latched on - which the old aircooled beetles used to do - if you turned the lights on a week later for example and it was it high beam position it came back on.)
One other point to note is that when the lights are turned off (say during daytime driving) you can flash the highbeam by pulling back on the stalk and it will just flash (it will not stay locked in the highbeam position). However, when doing the same at night it stays in the high beam position and must be flicked again to turn it back off.
Hence the labelling on the relay pins 5/56 is a connection to the headlight switch - if the light switch is not on then the flasher relay did not lock "on" - as I have tried to explain above. Also, when the ignition is turned off, the headlight switch terminal 56 also loses power and cuts power to the latched relay, resetting it (so the high beam is not on next time you switch on the lights)
Here is a schematic of how it is wired in the New Beetles- easier to visualise - very easy to adapt to other functions:
As you can see this relay may have some useful applications for those factory momentary switches such as the "Taxi interior light" and "Gas" switches, if you want to convert them to on/off switch function.
Late breaking news, just found this one:
Touareg Voltage Monitoring Relay for Multi Media System J813 - Part number 7L9 919 433
"The multimedia system is switched off by the voltage monitoring relay whenever the voltage falls below 10.7 V. The multimedia system is switched off by the voltage monitoring relay after about 20 minutes if the ignition is switched off and the multimedia system is switched on. Both measures are intended to protect the vehicle battery from being discharged and to prevent malfunctions to the multimedia system due to undervoltage".
Looks pretty simple to wire up -
30 - Battery voltage
15 -Ignition signal
31 - Earth
and just an output supply voltage to your monitored accessory.
Could be useful for something!
Hope some of the above information may be useful for someones projects.
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