SJC8AH6G24100000000HBAT01
Symptom
Diagnostic procedure
Also check for
21-12
Heating/Air Conditioning
Symptom Troubleshooting Index
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Recirculation control doors do not
change between Fresh and
Recirculate
Recirculation control motor circuit
troubleshooting (see page 21-37)
HVAC DTCs (see page 21-8)
Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
Cleanliness and tightness of all terminals
Blower, heater controls, and A/C
do not work
HVAC control power and ground circuit
troubleshooting (see page 21-39)
HVAC DTCs (see page 21-8)
Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
Poor ground at G402 (see page 22-68)
Cleanliness and tightness of all terminals
Both fans do not run at low speed
with the A/C on (but the A/C
compressor runs with the A/C on)
Radiator and A/C condenser fan low speed circuit
troubleshooting (see page 21-40)
HVAC DTCs (see page 21-8)
Blown fuse No. 20 (30 A) in the under-hood
fuse/relay box, and No. 30 (7.5 A) in the under-
dash fuse/relay box
Poor ground at G201 (see page 22-68)
Cleanliness and tightness of all terminals
The A/C condenser fan does not
run at high speed (but both fans
run at low speed and the A/C
compressor operates with the A/C
on)
A/C condenser fan high speed circuit
troubleshooting (see page 21-44)
HVAC DTCs (see page 21-8)
Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
Poor ground at G201 (see page 22-68)
Cleanliness and tightness of all terminals
Both fans do not run at high speed
with the A/C on (but both fans run
at low speed and the A/C
compressor operates with the A/C
on)
Radiator and A/C condenser fan high speed
circuit troubleshooting (see page 21-46)
HVAC DTCs (see page 21-8)
Poor ground at G202 (see page 22-68)
Cleanliness and tightness of all terminals
Both fans run at high speed all the
time with the A/C on
Radiator and A/C condenser fan high speed
circuit troubleshooting (see page 21-46)
HVAC DTCs (see page 21-8)
Poor ground at G202 (see page 22-68)
Cleanliness and tightness of all terminals
The A/C compressor clutch does
not engage (but both fans run with
the A/C on)
A/C compressor clutch circuit troubleshooting
(see page 21-47)
HVAC DTCs (see page 21-8)
Blower motor operation
Blown fuse No. 12 (7.5 A) in the under-hood
fuse/relay box, and No. 30 (7.5 A) in the driver’s
under-dash fuse/relay box
Cleanliness and tightness of all terminals
A/C system does not come on
(both fans and the A/C
compressor do not work); heater
is OK
A/C Pressure switch circuit troubleshooting
(see page 21-49)
Body DTCs in B-CAN System Diagnosis Test
Mode A Troubleshooting (see page 22-99)
HVAC DTCs (see page 21-8)
Cleanliness and tightness of all terminals
Blower fan runs slower than
expected in cold weather
ECT Troubleshooting: ECT sensor 2 circuit low
voltage (see page 11-149), ECT sensor 2 circuit
high voltage (see page 11-151)
NOTE: It is normal for the blower to run slowly
until the engine coolant temperature begins to
rise. If the blower continues to run slowly for an
abnormal length of time, continue to troubleshoot
the problem.
Powertrain DTCs (see page 11-3)
Blower motor operation
HDS does not communicate with
the HVAC control unit or the
vehicle
Troubleshoot the DLC (see page 11-194)