10 - The heating system equipment includes 4 diodes.
D1 = diode on blue lead connecting the fan control switch and terminal 85 of the relay.
With the ignition key in the OFF position, remove the relay and check with the voltmeter; current must flow from the
fan control switch toward the relay connector, and not the other way.
D2 = diode located between the leads (brown/white and black/red) of ventilation relay terminals 85 and 86.
With the ignition key in the OFF position, remove the relay and check with the voltmeter; current must flow from ter-
minal contact 86 toward terminal contact 85, not the other way.
D3 = diode located between terminal 85 of the heater alternator control relay and terminal 86 of the ventilation control
relay.
With the ignition key in the OFF position, remove both relays and check with the voltmeter; current must flow from
terminal 86 toward terminal 85 of the connector, but not the other way.
D4 = diode located on the lead between terminal 86 of the ventilation control relay and the junctions connecting
with leads coming from contact 5 (black - 1, 5) of the 12-pin connector and from contact 3 (black - 1, 5) of the 6-pin
connector.
Remove the ventilation control relay and ensure that the potentiometer is in the OFF position, then check with a
special purpose voltmeter that current flows from terminal 86 toward contact 3 of the 6-pin connector, not the other
way.
Caution: the voltmeter used for testing the diodes must be calibrated 0.5 V full scale.
systems
air conditioning
86
8
361
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www.classicmachinery.net
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