Fans wont turn on, car overheats idle. 

changed one defect fan, both now work with direct battery supply, changed the relay under the battery. 

still wont come on. 

 

i cant find any wiring diagram for this. anyone has them?

other tips? 

thanks : ) 

VIN/chassis number required to get sufficient data about the vehicle to find best wiring information, please.

Edited 30 August, 20241 yr by Breezy_Pete

sorry. 

TMBJX11U638690186
BFQ

The system for the BFQ is unique across the 1U platform.

 

Radiator fan control unit, radiator fan, air conditioning system magnetic coupling J110- Central locking control unit

J293

-

Radiator fan control unit

J393

-

Convenience electric central control unit

N25

-

Air conditioning system magnetic coupling

T2r

-

2-pin connector, for air conditioning system magnetic coupling

T3h

-

3-pin connector, in the holder on the left radiator

T3s

-

3-pin connector, in the holder on the left radiator

T4r

-

4-pin connector, at radiator fan control unit

T4t

-

4-pin connector, in the holder on the starter

T14a

-

14-pin connector, at radiator fan control unit

T14b

-

14-pin connector, on front left in engine compartment (black)

T15a

-

15-pin connector, at central locking control unit / at convenience electric central control unit

V7

-

Radiator fan

V35

-

Radiator fan, right

12a

-

Earth point -2-, below the battery on the left

188

-

Earth connection, in front left wiring harness

A49

-

Connection -1-, in wiring harness behind dash panel

L5

-

Connection -1-, in front left wiring harness

L6

-

Connection -2-, in front left wiring harness

*

-

only for vehicles with anti-theft alarm system

 

 

I'm going to PM you with some info in a minute.

 

Edit: unless @Crasher has already done enough!

 

 

Edited 30 August, 20241 yr by Breezy_Pete

all the fuses is okay.
the 4-pin connector, at radiator fan control unit seems to be working as intended. 
the termostat is changed, and all the temp sensors change resistance with temperature. 

 

so the 14-pin connector, at radiator fan control unit:
T14/4 and T14/9 both gives 14.1v

/2 from G65 High pressure sender (which im not sure what is, or located) gives 0.72volts.
/8 gives 0 volts but 14.1v with AC on. not sure where this is going either.
/3 - 0.02 volts not sure what this is either.
/10 - 0.00v
/6 - 0.00v

/13 which goes to Central locking control unit, dash panel and Convenience electric central control unit
fluctuates pretty fast, 5v-10v-12v-5v-10v-12v-5v-10v-12v and so on. 
which is weird?? or normal? xD

/11 and /7 which goes to the ECU i believe shows 0v with car off, and 0.02 - 0.03v with car on. 
so pretty dead? nothing happends here as temp increase either. 

 

suggestions? : )

/2 from G65 High pressure sender (which im not sure what is, or located) gives 0.72volts.

i ran 12v from the battery into the white wire in the g65 connector and the fans turned on.

is this a problem with the refrigerant? can i remove the sensor without any other problems occuring with the ac system?

the white wire is also connected to the ECU, why?