Relay unit, radiator fans (706a), Z19
|
Relay unit, radiator fans (706a), Z19
|
Relay unit containing relays and resistors and thermal fuse.
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
|