Honda Ridgeline. Manual — part 421
*01
*02
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−
−
−
−
−
YES
NO
YES
NO
YES
NO
21-120
Climate Control
DTC Troubleshooting (cont’d)
CLIMATE CONTROL UNIT 30P CONNECTOR
WHT/
BLU
RED/BLU
RED/YEL
RED/BLK
CLIMATE CONTROL UNIT 30P CONNECTOR
WHT/
BLU
RED/BLU
RED/YEL
RED/BLK
9. Check for continuity between body ground and the
climate control unit 30P connector No. 2, 3, 4, and
22 terminals individually.
Repair short to body ground in the wires
between the climate control unit and the mode
control motor.
Go to step 10.
10. Check for continuity between the climate control
unit 30P connector terminals as follows.
From terminal
To terminals
2
3, 4, 22
3
4, 22
4
18, 22
Repair the short in the wires.
Go to step 11.
11. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
Repair short to power in the wires between
the climate control unit and the mode control motor.
This short may also damage the climate control
unit. Repair the short to power before replacing the
climate control unit.
Check for loose wires or poor connections at
the climate control unit 30P connector and at the
mode control motor 7P 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.
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e continuity?
Is ther e any voltage?
*01
SJC8AH7K711000Y1240FAAT00
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−
−
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−
−
DTC B1240 or DTC indicator P:
YES
NO
YES
NO
YES
NO
21-121
CLIMATE CONTROL UNIT 30P CONNECTOR
YEL/BLU
MODE CONTROL MOTOR 7P CONNECTOR
YEL/RED
YEL/BLU
YEL/RED
A Problem in
the Mode Control Linkage, Doors, or Motor
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
Go to step 4.
Intermittent failure, check for loose wires or
poor connections on the mode control motor
circuit.
4. Turn the ignition switch OFF.
5. Test the mode control motor (see page 21-56).
Go to step 6.
Replace the mode control motor (see page
21-56), or repair the mode control linkage or
doors.
6. Disconnect the front mode control motor 7P
connector.
7. Disconnect the climate control unit 30P connector.
8. Check for continuity between the following
terminals of climate control unit 30P connector and
the front mode control motor 7P connector.
30P:
7P:
No. 18
No. 1
No. 19
No. 2
Go to step 9.
Repair open in the wire(s) between the
climate control unit and the mode control motor.
(cont’d)
Wire side of female terminals
Wire side of female terminals
Is DT C B1240 or P indicated?
Is the mode contr ol motor OK ?
Is ther e continuity?
*02
*01
SJC8AH7K711000Y1241FAAT00
−
−
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
YES
NO
DTC B1241 or DTC indicator Q:
21-122
21-122
Climate Control
DTC Troubleshooting (cont’d)
CLIMATE CONTROL UNIT 30P CONNECTOR
YEL/BLU
YEL/RED
BLOWER MOTOR 2P CONNECTOR
BLU/BLK
JUMPER WIRE
9. Check for continuity between body ground and
climate control unit 30P connector No. 18 and
No. 19 terminals individually.
Repair short to body ground in the wire(s)
between the climate control unit and the front
mode control motor.
Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
Go to step 4.
Intermittent failure, check for loose wires or
poor connections on the blower motor circuit.
4. Turn the ignition switch OFF.
5. Check the No. 21 (40 A) fuse in the under-hood
fuse/relay box, and the No. 30 (7.5 A) fuse in the
under-dash fuse/relay box.
Go to step 6.
Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 21 (40 A)
and No. 30 (7.5 A) fuses circuit.
6. Connect the blower motor 2P connector No. 2
terminal to body ground with a jumper wire.
7. Turn the ignition switch ON (II).
Go to step 8.
Go to step 23.
A Problem in
the Blower Motor Circuit
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is DT C B1241 or Q indicated?
Ar e the f uses OK ?
Does the blower motor r un?
02
03
04
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−
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−
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YES
NO
YES
NO
YES
NO
21-123
POWER TRANSISTOR 4P CONNECTOR
BLK
POWER TRANSISTOR 4P CONNECTOR
BLK
BLU/BLK
JUMPER WIRE
BLU/RED
BLU/
YEL
CLIMATE CONTROL UNIT 30P CONNECTOR
8. Turn the ignition switch OFF.
9. Disconnect the jumper wire.
10. Disconnect the power transistor 4P connector.
11. Check for continuity between the power transistor
4P connector No. 4 terminal and body ground.
Go to step 12.
Check for an open in the wire between the
power transistor and body ground. If the wire is OK,
check for poor ground at G402 (see page 22-68).
12. Connect the power transistor 4P connector No. 3
and No. 4 terminals with a jumper wire.
13. Turn the ignition switch ON (II).
Go to step 14.
Repair open in the BLU/BLK wire between the
power transistor and the blower motor.
14. Turn the ignition switch OFF.
15. Disconnect the jumper wire.
16. Disconnect the climate control unit 30P connector.
17. Check for continuity between body ground and the
climate control unit 30P connector No. 11 and
No. 12 terminals individually.
Repair short to body ground in the wires
between the climate control unit and the power
transistor.
Go to step 18.
(cont’d)
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Does the blower motor r un at high speed?
Is ther e continuity?
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