Honda Accord: A/C Signal Circuit Troubleshooting
NOTE: • If the blower motor does not run at all speeds, the A/C compressor will be inoperative. Run the self-diagnostic function, and check for DTC B1241.
Before performing any other troubleshooting, repair the cause of the inoperative blower motor.
• Do not use this troubleshooting procedure if any of the following items are operative: The condenser fan, the radiator fan, or the A/C compressor, or if the heater is inoperative. Refer to the symptom troubleshooting index.
• Before doing symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Turn the ignition switch to ON (II).
2. Check if the blower motor operates at all speeds.
YES
-Go to step 3.
NO
-Repair the problem in the blower motor circuit (see page21-166).
3. Do the sensor input display mode (see page 21-107).
Is Sensor #5 (evaporative outlet air temperature) above 3 В°C?.
YES
-Go to step 4.
NO
-Go to step 9.
4. Turn the ignition switch to LOCK (0).
5. Disconnect climate control unit connector A (28P).
6. Turn the ignition switch to ON (II).
7. Measure the voltage between climate control unit connector A (28P) terminal No. 21 and body ground.
CLIMATE CONTROL UNIT CONNECTOR A (28P)
Wire side of female terminals
* 1 : With navigation
*2: Without navigation
Is there battery voltage? YES-
Replace the climate control unit (with navigation) (see page 21-190), (without navigation) (see page 21-191 ).
NO
-Go to step 8.
8. Measure the voltage between driver's under-dash fuse/relay box connector F (33P) terminal No. 5 and body ground.
DRIVER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR F (33P)
Wire side of female terminals
Is there battery voltage? YES
-Repair an open in the wire between the climate control unit and the MICU.
NO
-Check for loose wire or poor connections at driver's under-dash fuse/relay box connector F (33P) terminal Mo. 5. if the connections are good, substitute a known-good MICU and recheck. If the symptom goes away, replace the original MICU.
9. Turn the ignition switch to LOCK (0).
10. Disconnect climate control unit connector B (12P).
11. Measure the evaporator temperature sensor resistance between climate control unit connector A (28P) terminal No. 23 and connector B (12P) terminal No. 10.
CLIMATE CONTROL UNIT CONNECTOR A (28P)
Wire side of female terminals
CLIMATE CONTROL UNIT CONNECTOR B (12P)
Wire side of female terminals
* 1 : With navigation
*2: Without navigation
Is the resistance less than 24 kO? YES-
Check for loose wires or poor connections at the climate control unit connectors. If the connections are good, substitute a known-good climate control unit and recheck. If the symptom goes away, replace the original climate control unit (with navigation) (see page 21-190), (without navigation) (see page 21-19D.
NO
-Test the evaporator temperature sensor (see page 21-58).
A/C Pressure Switch Circuit
Troubleshooting
NOTE:
• if the blower motor does not run at all speeds, the A/C
compressor will be inoperative. Run the
self-diagnostic function, and check for DTC B1241.
Before performing any other troubl ...
In-car Temperature Sensor Test
NOTE: Before testing the sensor, check for HVAC DTCs
(see page 21-101).
1. Remove the in-car temperature sensor (see page
21-184).
2. Test the in-car temperature sensor while holding it in
fr ...
See also:
Passenger's Air Mix Control Motor
Replacement
1. Remove the glove box (see page 20-174).
2, Disconnect the 4P connector (A) from the power
transistor (B), and the 7P connector (C) from the
passenger's air mix control motor (D). Remove the
s ...
How Your Side Curtain Airbags Work
In a moderate to severe side impact,
sensors will detect rapid acceleration
and signal the control unit to
instantly inflate the side curtain
airbag.
If the impact is on the passenger’s
...
Motor Replacement
NOTE: Put on gloves to protect your hands.
1. Remove the headliner (see page 20-140).
2. Disconnect the connector (A), and remove the screws,
then remove the motor (B).
3. Install the motor ...