MACS Monthly Newsletter - 2019 - JAN4

SOMETIMES WE THINK TOO HARD
wasn't really the problem (although the new battery wasn't
going to be removed for reinstallation of the old one, that's
for sure). So, the technician probes the HVAC control head
and finds that indeed, there's power to the head - with the
ignition off. He concludes there must be something wrong
with the ignition feed circuit. He disconnects the blower but
the HVAC control head is still powered up.
Fortunately, before he does something like replace the
HVAC control head or ignition switch, he looks at the wiring diagram (Figure 5). That turns on the "bulb" in his brain,
because while the blower relay coil is on the ignition circuit,
the relay contacts are on the feed from the 40-amp fuse in
the underhood relay/fuse box. Yup, the relay contacts were
sticking closed, and a new relay was the easy fix. ■

techinfo.honda.com

Thinking too hard (or a related issue, thinking too hard
about the wrong things), is a way to misdiagnose a problem,
leading to "going off on a tangent," as the expression goes.
The car, a 2005 Honda Pilot (that big SUV) was encountering a battery run down problem. Well the battery was four
years old and so the road service "quick fix" was to install
a new battery, which is exactly what the technician did. The
car was driven to the shop for other service and left in the
parking lot. However, while the car is sitting there, the technician goes out to pick up the old battery to return it for core
credit. He finds the HVAC control head on and the blower
motor running at high speed - with the keys hanging in the
shop office.
Well, that seems to indicate that maybe that old battery

Figure 5: The 2005 Honda Pilot was suffering continuous blower operation leading to battery rundown. Technician reading
the wiring diagram focused on possibilities of defective ignition switch and HVAC control head, and then it "hit him": perhaps
blower relay contacts were stuck on, and they were.

January 2019

4

MACS Service Reports



http://techinfo.honda.com

MACS Monthly Newsletter - 2019

Table of Contents for the Digital Edition of MACS Monthly Newsletter - 2019

MACS Monthly Newsletter - 2019 - JAN1
MACS Monthly Newsletter - 2019 - JAN2
MACS Monthly Newsletter - 2019 - JAN3
MACS Monthly Newsletter - 2019 - JAN4
MACS Monthly Newsletter - 2019 - JAN5
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MACS Monthly Newsletter - 2019 - JAN8
MACS Monthly Newsletter - 2019 - FEB1
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MACS Monthly Newsletter - 2019 - MAR1
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MACS Monthly Newsletter - 2019 - APR1
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MACS Monthly Newsletter - 2019 - MAY1
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MACS Monthly Newsletter - 2019 - MAY5
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MACS Monthly Newsletter - 2019 - MAY8
MACS Monthly Newsletter - 2019 - JUN1
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MACS Monthly Newsletter - 2019 - JUN3
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MACS Monthly Newsletter - 2019 - JUN5
MACS Monthly Newsletter - 2019 - JUN6
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MACS Monthly Newsletter - 2019 - JUN8
MACS Monthly Newsletter - 2019 - JUL1
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MACS Monthly Newsletter - 2019 - JUL3
MACS Monthly Newsletter - 2019 - JUL4
MACS Monthly Newsletter - 2019 - JUL5
MACS Monthly Newsletter - 2019 - JUL6
MACS Monthly Newsletter - 2019 - JUL7
MACS Monthly Newsletter - 2019 - JUL8
MACS Monthly Newsletter - 2019 - AUG1
MACS Monthly Newsletter - 2019 - AUG2
MACS Monthly Newsletter - 2019 - AUG3
MACS Monthly Newsletter - 2019 - AUG4
MACS Monthly Newsletter - 2019 - AUG5
MACS Monthly Newsletter - 2019 - AUG6
MACS Monthly Newsletter - 2019 - AUG7
MACS Monthly Newsletter - 2019 - AUG8
MACS Monthly Newsletter - 2019 - SEP1
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MACS Monthly Newsletter - 2019 - SEP3
MACS Monthly Newsletter - 2019 - SEP4
MACS Monthly Newsletter - 2019 - SEP5
MACS Monthly Newsletter - 2019 - SEP6
MACS Monthly Newsletter - 2019 - SEP7
MACS Monthly Newsletter - 2019 - SEP8
MACS Monthly Newsletter - 2019 - OCT1
MACS Monthly Newsletter - 2019 - OCT2
MACS Monthly Newsletter - 2019 - OCT3
MACS Monthly Newsletter - 2019 - OCT4
MACS Monthly Newsletter - 2019 - OCT5
MACS Monthly Newsletter - 2019 - OCT6
MACS Monthly Newsletter - 2019 - OCT7
MACS Monthly Newsletter - 2019 - OCT8
MACS Monthly Newsletter - 2019 - NOV1
MACS Monthly Newsletter - 2019 - NOV2
MACS Monthly Newsletter - 2019 - NOV3
MACS Monthly Newsletter - 2019 - NOV4
MACS Monthly Newsletter - 2019 - NOV5
MACS Monthly Newsletter - 2019 - NOV6
MACS Monthly Newsletter - 2019 - NOV7
MACS Monthly Newsletter - 2019 - NOV8
MACS Monthly Newsletter - 2019 - DEC1
MACS Monthly Newsletter - 2019 - DEC2
MACS Monthly Newsletter - 2019 - DEC3
MACS Monthly Newsletter - 2019 - DEC4
MACS Monthly Newsletter - 2019 - DEC5
MACS Monthly Newsletter - 2019 - DEC6
MACS Monthly Newsletter - 2019 - DEC7
MACS Monthly Newsletter - 2019 - DEC8
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