Relay unit, radiator fans (706a), Z19
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Relay unit, radiator fans (706a), Z19
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Relay unit containing relays and resistors and thermal fuse.
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Pin No.
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Signal type
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Description
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3
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+30
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Power supply 37RH from fuse holder 748.
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6
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+30
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Power supply 37LH from fuse holder 748.
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2
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Power ground
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Grounding of 37LH in grounding point G2.
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5
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Power ground
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Grounding of 37RH in grounding point G2.
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1, 4 and 7
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Control. Ground= active
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Grounded by the ECM. The pins are grounded differently depending on current fan stage, see table below.
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Connection stage
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Stage
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Pin 7
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Pin 4
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Pin 1
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1
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grounded
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2
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grounded
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3
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grounded
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grounded
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4
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grounded
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grounded
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grounded
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In stage 1 the fan motors are connected in series and supplied with voltage via pin 6.
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•
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Power supply
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•
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Control
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