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Relay unit, radiator fans (706a), Z19

Relay unit, radiator fans (706a), Z19

Location

Relay unit, radiator fans (706a)

Main task

To control the radiator fans.

Type


Relay unit containing relays and resistors and thermal fuse.

Connection

Pin No. Signal type Description
3 +30 Power supply 37RH from fuse holder 748.
6 +30 Power supply 37LH from fuse holder 748.
2 Power ground Grounding of 37LH in grounding point G2.
5 Power ground Grounding of 37RH in grounding point G2.
1, 4 and 7 Control. Ground= active Grounded by the ECM. The pins are grounded differently depending on current fan stage, see table below.




Connection stage

Stage Pin 7 Pin 4 Pin 1
1 grounded
2 grounded
3 grounded grounded
4 grounded grounded grounded


In stage 1 the fan motors are connected in series and supplied with voltage via pin 6.


Power supply


Control