Removing A/C from a 730 vehicle
timsiford at hushmail.com
timsiford at hushmail.com
Fri Feb 16 16:59:24 GMT 2001
Short: I removed the A/C from my car. Any special work needed to BIN?
I really don't think so but I want to confirm.
Long: I removed the condenser, accumulator, and A/C lines but left the wiring
harness and dashboard control intact. The 730 has one input for A/C information
(BC9, Dk Green Wire, Circuit #59). This wire runs to ....
1) the compressor clutch (off to ground)
2) then to the A/C high pressure switch
3) then to the Pressure cyling swtich
4) then to the A/C control switch
5) Fuse
6) Ignition
Do all 730 wiring harnesses contain Circuit #59 (even the 1LE without A/C)?
I know there aren't separate BINs for A/C and non A/C cars. The BIN works
with both cars.
Furthermore, Changes to the BIN, IMO don't seem to be necessary since the
circuit is never really closed until the A/C control switch (dash switch)
is in the 'on' position. 1LE cars don't have the A/C control switch and
can never close the circuit (if they do get circuit #59 in their wiring
harness?). Correct? I am asking because there is A LOT of code in the
ANHT_HAC that is dependent on A/C clutch on/off and A/C pressure ... I just
want to be -sure-.
Next question ... Diacom reports A/C Clutch status and A/C Request status.
How can it report 2 values when there is only one ECM input? My guess
is that both parameters will always read the same. True? But, I looked
at the HAC and even though it refers to A/C Clutch almost all of the time
there are a couple of references to A/C head pressure.
Tim
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