This is a collection of devices previously described that are directly connected to the J-Front (Left) Node at the front-right of the vehicle; one of the busiest nodes in the vehicle as it connects to a very wide range of devices.
This is a big muddy map sketching out how things are directly connected. Click on the image to open it in a new window.
Starting from the left, it manages alternator excitation and monitoring, engine start; radiator fan operation; oil pressure and temperature sensors and switches; coolant temperature, coolant level and ambient air temperature sensors for the instrument panel; all the lights on the front-left of the vehicle, monitors the reverse light switch, operates the horns, drives the windshield washer pump and operates the airconditioning compressor clutch according to pressure and temperature switches and command received over the LINbus.
In tabular form:
|Track||Colour(s)||Size mm²||Device||Device Port||Remarks|
|7||ge||6.0||BDB||SA1||Power supply for J-Front|
|8||ro/ws||0.5||B||15a||Starter Solenoid closure feedback|
|8||bl||0.5||C/C1||D+||Alternator excitation and monitoring|
|14||gn/sw||1.0||J293||3||Radiator Fan PWM|
|15||sw||1.0||J293||4||Radiator Fan KL_15|
|15||ro/li||1.0||F18||3||Radiator Thermoswitch common|
|16||ro/sw||1.0||F18||1||Radiator Thermoswitch 105°|
|17||ro/ws||1.0||F18||2||Radiator Thermoswitch 95°|
|20||ws/ge||0.5||J-InstAux||GALA||Road speed signal ex speedometer cable|
|63||gn/bl||0.5||J-Central?||RPM||Engine speed (ignition pulses)|
|63||or/ws||0.5||F87||Radiator Fan Post-Run 110°|
|73||ge/ro||0.5||G2||2||Coolant Temp. Gauge sensor|
|74||bl/sw||0.5||F22||Oil Pressure 0.3 Bar|
|75||ge||0.5||F18||Oil Pressure 1.8 Bar|
|114||gn/sw||0.5||G8||Oil Temperature sensor|
|117||ws/ro||0.5||G17||2||Air temperature sensor|
|118||br/ge||0.5||G17||1||Air temperature sensor|
|155||br||2.5||Main Chassis at front left common (119)|
|157||ws||1.0||L13||1||Driving Light Left|
|158||ws/sw||1.0||L1||56a||Headlight Low beam Left|
|159||ge/sw||1.0||L1||56b||Headlight High beam Left|
|160||gr/sw||0.5||M1||1/58||Park light left|
|183||sw/ws||1.0||M5||BLL||Indicator Front Left|
|1.0||M?||Side Repeater Left (not shown)|
|191||ws/ge||1.0||L22||1||Fog Light Front Left|
|207||sw/bl||1.0||F4||2||Reverse Light switch|
|208||sw/ro||1.0||F4||1/58||Reverse Light switch|
|224||sw/ge||1.0||H1||C13||Dual tone horns|
|255||gn/ro||1.0||V59||1||Washer pump (reversible)|
|256||br/ge||1.0||V59||2||Washer pump (reversible)|
|||ro/gn||1.0||Switch||A/C Low Pressure 2 Bar|
|||gn||1.0||Switch||A/C Thermoswitch on engine 119°|
|||ro/sw||1.0||Compressor||A/C Compressor Clutch|
|||ro/ws||1.0||Switch||A/C High Pressure|
All quite preliminary with simplifications and complications likely as well as cable colour and cross-sectional area changes possible during the design evolution of the node. More devices may be added. Some may be delegated to connection to other nodes.
There are 3 “bus” connections; LINbus obviously; engine RPM signal which is a buffered repeat of the ignition control pulses by J-Central; and road speed, buffered out of the GALA output signal from the stock instrument cluster by J-InstAux. Engine speed is necessary for the management of the engine start flick-to start process and road speed is useful for reducing radiator fan speed once the vehicle is moving quickly enough.
If you’re counting; that makes it about 40 connections into or out of the node to the surrounding devices. A few very heavy ones; mainly for power, the starter solenoid (which’d consume the most power via the node) and chassis ground. But most others are of small cross-section because they only monitor switch state or carry a small current to operate a sensor.
The headlights of course carry significant current; but nothing that a copper cross-section of 1mm² can’t handle; even when heated by the nearby radiator.