25-01-2016, 11:26 AM
(This post was last modified: 25-01-2016, 11:32 AM by pug306driver.)
That's the one, the coolant heater plugs relay board, 2 relays and 2 fuses, one relay and fuse for each pair of coolant heater plugs, 2 pairs of 2 coolant heater plugs, each pair wired in parallel and independent of the other pair, and earthed thru the alloy uni9t and bracket to the engine.
There must be some buss bars in the board to connect the relays to the energizer wires, which seem to be mainly grouped at one end of the board.
The thick white wire goes to one pair of plugs and the thick brown wire to the other pair.
One pair comes on at a low temp and the other pair then comes on for a lower temp??
Both pairs of plugs showed 15ish ohm ( 14, 15 ohms ) but the relay closest to the engine has some heat damage ( the power feed to the plugs shows some overheating, spade blades sticks out a bit ) and the female terminal in the board shows some plastic deformation due to heat .
I assume this "circuit" is the low temp circuit which would come on more often?
Will clarify which wire ( white or brown ) and which set of plugs.
Does the ecu get feedback that the set of coolant heater plugs relay is "on" as there is one small wire coming from the engine end relay area, the brown wired power feed to the plugs area? or may be a warning light that the coolant heater plug system is "on or working" ?
It could be that relays energizer wire?
The black and green box with blue writing is the relay for the engine heater plugs.
There must be some buss bars in the board to connect the relays to the energizer wires, which seem to be mainly grouped at one end of the board.
The thick white wire goes to one pair of plugs and the thick brown wire to the other pair.
One pair comes on at a low temp and the other pair then comes on for a lower temp??
Both pairs of plugs showed 15ish ohm ( 14, 15 ohms ) but the relay closest to the engine has some heat damage ( the power feed to the plugs shows some overheating, spade blades sticks out a bit ) and the female terminal in the board shows some plastic deformation due to heat .
I assume this "circuit" is the low temp circuit which would come on more often?
Will clarify which wire ( white or brown ) and which set of plugs.
Does the ecu get feedback that the set of coolant heater plugs relay is "on" as there is one small wire coming from the engine end relay area, the brown wired power feed to the plugs area? or may be a warning light that the coolant heater plug system is "on or working" ?
It could be that relays energizer wire?
The black and green box with blue writing is the relay for the engine heater plugs.