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Automotive Electricians Portal FZCO
Automotive Electricians Portal FZCO Location of componentsComponents DescriptionThe engine radiator and air conditioner condenser cooling system consists of one fan operated at two different speeds.the first speed is activated at a first coolant temperature level or at a certain air conditioner coolant pressure.the second speed cuts in at a higher temperature or pressure threshold.
The operation of the fan is achieved by means of two special relays located in the relay and fuse box in the engine compartment.The fan supply line is protected by a special maxifuse, located next to the above mentioned box, whilst the circuit for energizing the relays is protected by the fuse which protects numerous other services controlled by the ignition.The fan therefore only comes on when the ignition is switched ON.
Functional description The supply for the fan N11 arrives directly from the battery from the line for the maxifuse B8 : the fan therefore operates when it receives an earth command. The relays J30 and J31 have coils supplied by the line controlled by the ignition (15/54) protected by fuse B25 . They are energized by an earth signal coming from the engine control unit M10 . If the coolant temperature reaches the first temperature stage, or the 4-stage pressure switch K10 (pin 3) indicates to control unit M10 (pin 35 of connector A) that the first pressure stage has been reached, control unit M10 sends an earth signal (from pin 40 of connector A) to the fan J30 1st speed relay which energizes the coil. The relay then sends an earth signal which, via the additional resistance O10 , operates the fan N11 which rotates at the first (slow) speed. If the engine coolant reaches a higher temperature level or the 4 stage pressure switch K10 (pin 1) signals to the control unit M10 (pin 21 of connector A) that a second pressure stage has been reached, then the control unit M10 sends an earth signal (from pin 14 of connector A) to the 2nd speed fan relay J31 which energizes the coil. The relay then sends an earth signal directly to the fan N11 which rotates at the maximum speed.
Engine fan fuse (MAXI FUSE)
B008
B008
B008
B008
B008
Ignition-operated services supply fuse 1554
B025
B025
B025
B025
B025
B025
B025
B025
B025
B025
B025
Injection memory and CODE fuse
B035
B035
B035
B035
B035
Left front earth
C010A
C010B
C010C
C010C
C010D
C010D
C010A
C010A
C010A
C010A
C010A
C010A
C010A
C010A
Front/engine junction
D004A
D004A
D004B
D004B
D004
D004
D004
D004
D004A
D004A
D004B
D004B
D004B
D004B
D004B
D004
D004
D004
D004
D004B
D004B
D004B
D004B
D004B
D004B
D004B
D004B
D004B
Ignition switch
H001A
H001A
H001A
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
Ignition switch
H001A
H001A
H001A
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
Engine fan 2nd speed relay
J031
J031
J031
J031
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005