VW golf mk5

[Kazaki]

Hi all I currently have a Mk5 golf with no heater blower working it keeps blowing the 40amp fuse IV tried a new heater blower out of another golf it's not that IV even replaced the resistor I have tried unplugging the blower and turning it on and it gets to 1,2 fine but doesn't work the blower and when I try setting 3,4 it just instantly blows the main 40amp fuse for the blower I am so lost on what it mite be any help would be greatly appreciated especially since the snow and ice is here.

[Crasher]

So it blows fuse SC40 on speeds 3 and 4 even with the motor unplugged? What about when the resistor is unplugged?

[Kazaki]

No it doesn't blow at all on any setting but the fuse only blows when it hits setting 3,4

[Kazaki]

Even when and resistor and blower are unplugged it still blows the fuse.

[Crasher]

I can only see that being damaged wiring from control panel to resistor or a short inside the control head.

[Kazaki]

Is that the dial settings in middle of dash?

[Kazaki]

I can see myself pulling out the whole dash 🤦

[Crasher]

I would remove the control panel and with the wiring unplugged from the panel, resistor and fan, check for a short to ground on each wire.




E9-Switch for fresh air blower
J13-Relay for fresh air blower
J301-Air conditioning control unit
J519-On-board power supply control unit
J533-Diagnostic interface for data bus, under the control panel on the left
K10-Indicator light for heated rear window
L16-Lamp for lighting when regulating fresh air
N24-Series resistor for fresh air blowers with overheating protection
T4f-plug connection, 4-point
T5-Plug connection, 5-point
T10k-Plug connection, 10-point under the right control panel
T20-Plug connection, 20-point
T20c-Plug connection, 20-point
V2-Fresh air blower
47-Ground point in the front right footwell
375-Ground connection 10 in the main wiring harness
B397-Connection 1 (CAN bus comfort high) in the main cable harness
B406-Connection 1 (CAN bus comfort low) in the main wiring harness
L77-Connection in the fresh air blower wiring harness
L78-Connection in the fresh air blower wiring harness
-●- Only for vehicles with additional water heating