Acura CSX. Manual — part 482
01
SNR9A00K711000Y1240FAAT00
−
−
−
−
DTC B1240 or DTC indicator N:
YES
NO
YES
NO
21-46
Climate Control
CLIMATE CONTROL UNIT 32P CONNECTOR
GRN
WHT
MODE CONTROL MOTOR 7P CONNECTOR
WHT
GRN
A Problem in
the Mode Control Linkage, Doors, or Motor
1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page
21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the mode control motor 7P connector.
7. Disconnect the climate control unit 32P connector.
8. Check for continuity between the following
terminals of climate control unit 32P connector and
the mode control motor 7P connector.
32P:
7P:
No. 10
No. 1
No. 12
No. 2
Go to step 9.
Repair open in the wire(s) between the
climate control unit and the mode control motor.
Wire side of female terminals
Wire side of female terminals
Is DT C B1240 or N indicated?
Is ther e continuity?
08/08/21 14:42:21 61SNR030_210_0047
02
01
SNR9A00K711000Y1241FAAT00
−
−
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
YES
NO
DTC B1241 or DTC indicator P:
21-47
21-47
WHT
GRN
CLIMATE CONTROL UNIT 32P CONNECTOR
BLOWER MOTOR 2P CONNECTOR
JUMPER WIRE
GRN
9. Check for continuity between body ground and the
climate control unit 32P connector terminals No. 10
and No. 12 individually.
Repair short to body ground in the wire(s)
between the climate control unit and the mode
control motor.
Go to step 10.
10. Test the mode control motor (see page 21-73).
Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
Replace the mode control motor (see page
21-73), or repair the mode control linkage or
doors.
1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page
21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure, check for loose wires or
poor connections on the blower motor circuit.
5. Turn the ignition switch to LOCK (0).
6. Check the No. 9 (40 A) fuse in the under-hood
fuse/relay box, and the No. 36 (10 A) fuse in the
under-dash fuse/relay box.
Go to step 7.
Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 9 (40 A) and
No. 36 (10 A) fuses circuit.
7. Connect the blower motor 2P connector terminal
No. 2 to body ground with a jumper wire.
A Problem in
the Blower Motor Circuit
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is the mode contr ol motor OK ?
Is DT C B1241 or P indicated?
Ar e the f uses OK ?
08/08/21 14:42:21 61SNR030_210_0048
02
03
04
−
−
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
YES
NO
21-48
Climate Control
POWER TRANSISTOR 4P CONNECTOR
BLK
POWER TRANSISTOR 4P CONNECTOR
BLK
JUMPER WIRE
GRN
BLU
YEL
CLIMATE CONTROL UNIT 32P CONNECTOR
8. Turn the ignition switch to ON (II).
Go to step 9.
Go to step 24.
9. Turn the ignition switch to LOCK (0).
10. Disconnect the jumper wire.
11. Disconnect the power transistor 4P connector.
12. Check for continuity between the power transistor
4P connector terminal No. 2 and body ground.
Go to step 13.
Check for an open in the wire between the
power transistor and body ground. If the wire is OK,
check for poor ground at G401 (see page 22-64).
13. Connect the power transistor 4P connector
terminals No. 2 and No. 4 with a jumper wire.
14. Turn the ignition switch to ON (II).
Go to step 15.
Repair open in the GRN wire between the
power transistor and the blower motor.
15. Turn the ignition switch to LOCK (0).
16. Disconnect the jumper wire.
17. Disconnect the climate control unit 32P connector.
18. Check for continuity between body ground and the
climate control unit 32P connector terminals No. 13
and No. 14 individually.
Repair short to body ground in the wire(s)
between the climate control unit and the power
transistor.
Go to step 19.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Does the blower motor r un?
Is ther e continuity?
Does the blower motor r un at high speed?
Is ther e continuity?
08/08/21 14:42:22 61SNR030_210_0049
05
06
07
−
−
−
−
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
21-49
BLU
YEL
BLU
YEL
POWER TRANSISTOR 4P CONNECTOR
CLIMATE CONTROL UNIT 32P CONNECTOR
BLU
YEL
CLIMATE CONTROL UNIT 32P CONNECTOR
BLOWER MOTOR 2P CONNECTOR
WHT
19. Check for continuity between the following
terminals of the climate control unit 32P connector
and the power transistor 4P connector.
32P:
4P:
No. 13
No. 1
No. 14
No. 3
Go to step 20.
Repair open in the wire(s) between the
climate control unit and the power transistor.
20. Turn the ignition switch to ON (II).
21. Measure the voltage between body ground and the
climate control unit 32P connector terminals No. 13
and No. 14 individually.
Repair short to power in the wire(s).
Go to step 22.
22. Reconnect the climate control unit 32P connector.
23. Test the power transistor (see page 21-71).
Check for loose wires or poor connections at
the climate control unit 32P connector and at the
power transistor 4P connector. If the connections
are good, substitute a known-good climate control
unit, and recheck. If the symptom/indication goes
away, replace the original climate control unit.
Replace the power transistor.
24. Disconnect the jumper wire.
25. Disconnect the blower motor 2P connector.
26. Measure the voltage between the blower motor 2P
connector terminal No. 1 and body ground.
Replace the blower motor.
Go to step 27.
27. Turn the ignition switch to LOCK (0).
28. Remove the blower motor relay from the under-
hood fuse/relay box, and test it (see page 22-70).
Go to step 29.
Replace the blower motor relay.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e voltage?
Is the power tr ansistor OK ?
Is ther e batter y voltage?
Is the r elay OK ?
08/08/21 14:42:22 61SNR030_210_0050
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