Honda 2004 Odyssey Service Manual page 1611

Climate Control
DTC Troubleshooting
DTC indicator A: An Open in the In-car
Temperature Sensor Circuit
1. Remove the in-car temperature sensor (see page
21-117).
2. Measure the resistance between the No. 1 and
No. 2 terminals of the in-car temperature sensor.
Check for a change in resistance by heating or
cooling the sensor with a hair drier.
IN-CAR TEMPERATURE SENSOR
12
11
10
9
8
7
RESISTANCE
k
6
5
4
3
2
1
14
10
Is the resistance within the specif ications shown
on the graph?
YES
• Without Navigation System: Go to step 3.
• With Navigation System: Go to step 6.
NO Replace the in-car temperature sensor.
3. Disconnect climate control unit connector B (20P).
21-80
32 86
50 68 104 °F
0
10 20 30 40 °C
TEMPERATURE
4. Check for continuity between the No. 16 terminal of
climate control unit connector B (20P) and the No.
2 terminal of the in-car temperature sensor 2P
connector.
CLIMATE CONTROL UNIT CONNECTOR B (20P)
Wire side of female terminals
IN-CAR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES Go to step 5.
NO Repair open in the wire between the climate
control unit and the in-car temperature sensor.
5. Check for continuity between the No. 11 terminal of
climate control unit connector B (20P) and the No. 1
terminal of the in-car temperature sensor 2P
connector.
CLIMATE CONTROL UNIT CONNECTOR B (20P)
Wire side of female terminals
YEL/GRN
YEL/GRN
IN-CAR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES Check for loose wires or poor connections at
climate control unit connector B (20P) and at the in-
car temperature sensor 2P 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.
NO Repair open in the wire between the climate
control unit and the in-car temperature sensor.
YEL/RED
YEL/RED