Acura CSX. Manual — part 566
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SNR9A00G24166100000EAAT00
22-311
Circuit Diagram
IG2 HOT in ON (II)
G12
C3
CLIMATE CONTROL UNIT
LT GRN
BLK
G603
2
BRN
LT GRN
LT GRN
BLK
No. 2 (IG) (50 A)
G801
1
RED
RED
UNDER-HOOD FUSE/RELAY BOX
G504
BLK
RED
BRN
No. 8
(30 A)
No. 36
(HAC)
(10 A)
ORN
IGNITION SWITCH
IG2
BAT
WHT
BATTERY
No. 1 (BAT) (100 A)
UNDER-DASH
FUSE/RELAY
BOX
REAR
WINDOW
DEFOGGER
RELAY
REAR WINDOW
DEFOGGER
SWITCH
INDICATOR
(Rear window defogger
switch and defogger
timer circuit built into
the climate control unit.)
NOISE
CONDENSER
REAR
WINDOW
DEFOGGER
POWER
MIRROR
DEFOGGER
RELAY
H1
D1
J4
F17
F8
2
3
5
1
1
MICU
Q16
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SNR9A00G24166150451FEAT01
22-312
Rear Window Defogger
Function Test
A
B
About 2.0 V
About 6 V
About 11 V
About 8.5 V
About 4.2 V
NOTE:
• Be careful not to scratch or damage the defogger
wires with the tester probe.
• Before testing, check the No. 8 (30 A) fuse in the
under-hood fuse/relay box and the No. 36 (10 A) fuse
in the under-dash fuse/relay box.
1. Measure the voltage between the positive terminal
(A) and body ground with the ignition switch turned
to ON (II) and the defogger switch ON.
There should be battery voltage.
• If there is no voltage, check for:
– Faulty rear window defogger relay.
– Faulty climate control unit.
– An open in the RED wire to the positive
terminal.
• If there is voltage, go to step 2.
2. Disconnect the negative terminal (B) from the rear
window defogger.
3. Check for continuity between the negative terminal
and body ground.
If there is no continuity, check for an open in the
wire or poor ground (G801). If there is continuity,
go to step 4.
4. Reconnect the negative terminal to the rear
window defogger.
5. Turn the ignition switch to ON (II) and the rear
window defogger switch ON.
6. Touch the voltmeter positive probe to each point
on each defogger wire, and the negative probe to
the negative terminal.
• If the voltage is as specified, the defogger wire
up to that point is OK.
• If the voltage is not as specified, repair the
defogger wire.
– If it is more than specified at one of the points,
there is a break in the negative half of the wire.
– If it is less than specified at one of the points,
there is a break in the positive half of the wire.
08/08/21 14:36:55 61SNR030_220_0314
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22-313
Defogger Wire Repair
C
B
A
A
NOTE: To make an effective repair, the broken section
must be no longer than 25 mm (1 in.).
1. Lightly rub the area around the broken section (A)
with fine steel wool, then clean it with isopropyl
alcohol.
2. Carefully mask above and below the broken portion
of the defogger wire (B) with cellophane tape (C).
3. Using a small brush, apply a heavy coat of silver
conductive paint (commercially available) (A)
extending about 3.1 mm (1/8 in.) on both sides of
the break. Allow 25 minutes to dry.
4. Do the function test to confirm that the wire is
repaired (see page 22-312).
5. Apply a second coat of paint in the same way. Let it
dry 3 hours before removing the tape.
08/08/21 14:36:55 61SNR030_220_0315
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22-314
Immobilizer System
Component Location Index
IMMOBILIZER INDICATOR
IMMOBILIZER-KEYLESS CONTROL UNIT (With built-in receiver)
IMOES UNIT
(Built into the MICU)
TRANSPONDER
(Combined with the
keyless transmitter)
IGNITION KEY
IGNITION KEY
(Including transponder)
ECM/PCM
Symptom Troubleshooting Information, page 22-321
System Check, page 22-326
Registration, page 22-329
Input Test, page 22-330
Replacement, page 22-332
Transmitter Test,
page 22-142
Replacement,
page 11-228
Substitute known-
good for testing,
page 11-7
08/08/21 14:36:57 61SNR030_220_0316
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