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21-53
Climate Control Power and Ground Circuit Troubleshooting
LT GRN
CLIMATE CONTROL UNIT 32P CONNECTOR BLK
CLIMATE CONTROL UNIT 32P CONNECTOR
1. Check the No. 36 (10 A) fuse in the under-dash fuse/
relay box.
Go to step 2.
Replace the fuse, and recheck. If the fuse
blows again, check for a short in the No. 36 (10 A)
fuse circuit.
2. Disconnect the climate control unit 32P connector.
3. Turn the ignition switch to ON (II).
4. Measure the voltage between the climate control unit 32P connector terminal No. 3 and body ground.
Go to step 5.
Repair an open in the wire between the No. 36
(10 A) fuse in the under-dash fuse/relay box and the
climate control unit. 5. Turn the ignition switch to LOCK (0).
6. Check for continuity between the climate control
unit 32P connector terminal No. 5 and body ground.
Check for loose wires and poor connections
at the climate control unit 32P connector. If
connections are good, substitute a known-good
climate control unit and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
Check for an open in the wire between the
climate control unit and body ground. If the wire is
OK, check for poor ground at G504 (see page 22-64).
Wire side of female terminals Wire side of female terminals
IsthefuseOK?
Is there battery voltage? Is there continuity?
08/08/21 14:42:24 61SNR030_210_0054
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21-56Climate Control
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
RADIATOR FAN RELAY 4P SOCKET
RADIATOR FAN RELAY 4P SOCKET
JUMPER WIRE
BRN
NOTE: Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom
troubleshooting index.
Before performing symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Check the No. 7 (20 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 2.
Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 7 (20 A) and
No. 36 (10 A) fuses circuit.
2. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see page 22-70).
Go to step 3.
Replace the radiator fan relay.
3. Connect the HDS to the DLC.
4. Turn the ignition switch to ON (II).
5. Turn on the A/C.
6. Check the FAN LOW CTRL in the PGM-FI Data List with the HDS.
Go to step 7.
Substitute a known-good ECM/PCM (see page
11-7), and retest. If the symptom/indication goes
away with a known-good ECM/PCM, replace the
original ECM/PCM (see page 11-228).
7. Turn the ignition switch to LOCK (0). 8. Measure the voltage between the radiator fan relay
4P socket terminal No. 1 and body ground.
Go to step 9.
Replace the under-hood fuse/relay box
(see page 22-65).
9. Connect the radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.
Go to step 10.
Go to step 19.
Ar e t he f uses OK ?
Is the relay OK ?
I s t he F AN LOW CT RL on? Is there battery voltage?
Do t he A/ C cond enser and r ad i at or f ans r un onlow?
08/08/21 14:42:25 61SNR030_210_0057
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21-57
RADIATOR FAN RELAY 4P SOCKET ECM/PCM CONNECTOR A (44P)PUR
JUMPER WIRE
10. Disconnect the jumper wire.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between the radiator fan relay 4P socket terminal No. 3 and body ground.
Go to step 13.
Go to step 37. 13. Turn the ignition switch to LOCK (0).
14. Reinstall the radiator fan relay.
15. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the engine
control module (ECM)/powertrain control module
(PCM) from damage.
16. Disconnect ECM/PCM connector A (44P).
17. Connect the ECM/PCM connector A (44P) terminal No. 4 to body ground with a jumper wire.
18. Turn the ignition switch to ON (II). Check for loose wires or poor connections at
ECM/PCM connector A (44P) terminal No. 4. If the
connections are good, substitute a known-good
ECM/PCM, and recheck. If the symptom/indication
goes away, replace the original ECM/PCM
(see page 11-228).
Repair open in the wire between the radiator
fan relay and the ECM/PCM.
19. Disconnect the jumper wire.
20. Reinstall the radiator fan relay.
21. Disconnect the radiator fan 2P connector.
22. Turn the ignition switch to ON (II), then set the A/C button and fan control dial ON.
(cont’d)
Terminal side of female terminals
Is there battery voltage?
Do t he A/ C cond enser and r ad i at or f ans r un onlow?
08/08/21 14:42:26 61SNR030_210_0058
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DYNOMITE -2009-
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21-58
Climate Control
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
(cont’d)
RADIATOR FAN 2P CONNECTOR
BRN
RADIATOR FAN 2P CONNECTOR RED
JUMPER WIRE FAN CONTROL RELAY 5P SOCKET
RED
23. Measure the voltage between the radiator fan 2Pconnector terminal No. 2 and body ground.
Go to step 24.
Repair open in the wire between the radiator
fan relay and the radiator fan.
24. Set the A/C button and fan control dial OFF, then turn the ignition switch to LOCK (0).
25. Reconnect the radiator fan 2P connector.
26. Connect the radiator fan 2P connector terminal No. 1 to body ground with a jumper wire.
27. Turn the ignition switch to ON (II), then set the A/C button and fan control dial ON.
Go to step 28.
Replace the radiator fan motor. 28. Set the A/C button and fan control dial OFF, then
turn the ignition switch to LOCK (0).
29. Disconnect the jumper wire.
30. Remove the fan control relay from the under-hood fuse/relay box, and test it (see page 22-70).
Go to step 31.
Replace the fan control relay.
31. Turn the ignition switch to ON (II), then set the A/C button and fan control dial ON.
32. Measure the voltage between the fan control relay 5P socket terminal No. 1 and body ground.
Go to step 33.
Repair open in the wire between the radiator
fan and the fan control relay.
33. Set the A/C button and fan control dial OFF, then turn the ignition switch to LOCK (0).
Wire side of female terminals
Wire side of female terminals
Is there battery voltage?
Does t he r ad i at or f an r un? Is the relay OK ?
Is there battery voltage?
08/08/21 14:42:26 61SNR030_210_0059
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21-59
FAN CONTROL RELAY 5P SOCKET
BLUBLU
A/C CONDENSER FAN 2P CONNECTOR
BLK
A/C CONDENSER FAN 2P CONNECTOR
A/C DIODE A
1 2
1 2
A/C DIODE A 2P SOCKET BRN
34. Disconnect the A/C condenser fan 2P connector.
35. Check for continuity between the fan control relay5P socket terminal No. 4 and the A/C condenser fan
2P connector terminal No. 2.
Go to step 36.
Repair open in the wire between the fan
control relay and the A/C condenser fan.
36. Check for continuity between the A/C condenser fan 2P connector terminal No. 1 and body ground.
Replace the A/C condenser fan motor.
Check for an open in the wire between the A/C
condenser fan and body ground. If the wire is OK,
check for poor ground at G301 (see page 22-64). 37. Turn the ignition switch to LOCK (0).
38. Remove A/C diode A from the under-hood fuse/
relay box.
39. Using the diode setting ( ) on a DVOM, check for current flow in both directions between the A/C
diode A terminals No. 1 and No. 2.
Go to step 40.
Replace A/C diode A.
40. Turn the ignition switch to ON (II).
41. Measure the voltage between the A/C diode A 2P socket terminal No. 2 and body ground.
Replace the under-hood fuse/relay box
(see page 22-65).
Repair open in the wire between the No. 36
(10 A) fuse in the under-dash fuse/relay box and
A/C diode A.
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there continuity? I s t her e cur r ent f l ow i n onl y one d i r ect i on?
Is there battery voltage?
08/08/21 14:42:27 61SNR030_210_0060
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21-60Climate Control
A/C Condenser Fan High Speed Circuit Troubleshooting
A/C CONDENSER FAN RELAY 4P SOCKET
JUMPER WIRE
BLU
A/C CONDENSER FAN RELAY 4P SOCKET
A/C CONDENSER FAN RELAY 4P SOCKET
NOTE:
Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom
troubleshooting index.
Before performing symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Check the No. 6 (20 A) and No. 15 (7.5 A) fuses in the under-hood fuse/relay box.
Go to step 2.
Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 6 (20 A) and
No.15(7.5A)fusescircuit.
2. Remove the A/C condenser fan relay from the under-hood fuse/relay box, and test it (see page
22-70).
Go to step 3.
Replace the A/C condenser fan relay.
3. Measure the voltage between the A/C condenser fan relay 4P socket terminal No. 1 and body ground.
Go to step 4.
Replace the under-hood fuse/relay box
(see page 22-65). 4. Connect the A/C condenser fan relay 4P socket
terminals No. 1 and No. 2 with a jumper wire.
Go to step 5.
Replace the under-hood fuse/relay box
(see page 22-65).
5. Disconnect the jumper wire.
6. Turn the ignition switch to ON (II).
7. Measure the voltage between the A/C condenser fan relay 4P socket terminal No. 4 and body ground.
Go to step 8.
Go to step 14.
Ar e t he f uses OK ?
Is the relay OK ?
Is there battery voltage? Does t he A/ C cond enser f an r un on hi gh?
Is there battery voltage?
08/08/21 14:43:31 61SNR030_210_0061
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21-61
ECM/PCM CONNECTOR A (44P)
GRY
JUMPER WIRE A/C DIODE B 2P SOCKET
A/C DIODE B
1 2
1 2
8. Turn the ignition switch to LOCK (0).
9. Reinstall the A/C condenser fan relay.
10. Jump the SCS line with the HDS. NOTE: This step must be done to protect the engine
control module (ECM)/powertrain control module
(PCM) from damage.
11. Disconnect ECM/PCM connector A (44P).
12. Connect the ECM/PCM connector A (44P) terminal No. 5 to body ground with a jumper wire.
13. Turn the ignition switch to ON (II). Check for loose wires or poor connections at
ECM/PCM connector A (44P) terminal No. 5. If the
connections are good, substitute a known-good
ECM/PCM, and recheck. If the symptom/indication
goes away, replace the original ECM/PCM
(see page 11-228).
Repair open in the wire between the A/C
condenser fan relay and the ECM/PCM. 14. Remove the A/C diode B from the under-hood fuse/
relay box.
15. Turn the ignition switch to ON (II).
16. Measure the voltage between the A/C diode B 2P socket terminal No. 2 and body ground.
Go to step 17.
Replace the under-hood fuse/relay box
(see page 22-65).
17. Using the diode setting ( ) on a DVOM, check for current flow in both directions between the A/C
diode B terminals No. 1 and No. 2.
Replace the under-hood fuse/relay box
(see page 22-65).
Replace the A/C diode B.
Terminal side of female terminals
Does t he A/ C cond enser f an r un on hi gh? Is there battery voltage?
I s t her e cur r ent f l ow i n onl y one d i r ect i on?
08/08/21 14:43:32 61SNR030_210_0062
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DYNOMITE -2009-
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21-62
Climate Control
A/C Compressor Clutch Circuit Troubleshooting
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
NOTE:
It is normal for the A/C compressor to turn off under certain conditions, such as low idle, high engine
coolant temperature, or hard acceleration.
Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the
symptom troubleshooting index.
Before doing any symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Check the No. 20 (7.5 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 2.
Replace the fuses and recheck. If the fuses
blow again, check for a short in the No. 20 (7.5 A)
and No. 36 (10 A) fuses circuit.
2. Connect the HDS to the DLC.
3. Start the engine.
4. Turn on the A/C.
5. Using the HDS, confirm the following values in the PGM-FI Data List at idle.
ECT Sensor 2 80 100 °C (176 212 °F)
TP Sensor About 0.5 V at idle
RPM More than 670
A/C Switch ON
A/C Clutch ON
A/C Pressure
Sensor 196 455 kPa (28 455 psi)
Go to step 6.
Troubleshoot the value that is not within the
specifications. 6. Turn the ignition switch to LOCK (0).
7. Remove the A/C compressor clutch relay from the
under-hood fuse/relay box, and test it (see page
22-70).
Go to step 8.
Replace the A/C compressor clutch relay.
8. Measure the voltage between the A/C compressor clutch relay 4P socket terminal No. 1 and body
ground.
Go to step 9.
Replace the under-hood fuse/relay box
(see page 22-65).
Ar e t he f uses OK ?
Are all the values within specif ications? Is the relay OK ?
Is there battery voltage?
08/08/21 14:43:32 61SNR030_210_0063
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