Honda 2004 Odyssey Service Manual page 1557

Heating/Air Conditioning
Heater Control Power and Ground Circuit Troubleshooting
1. Check the No. 54 (40A) fuse in the under-hood
fuse/relay box, the No. 3 (7.5A) fuse in the driver's
under-dash fuse/relay box, and the No. 13 (7.5A)
fuse in the passenger's under-dash fuse/relay box.
Are the f uses OK ?
YES Go to step 2.
NO Replace the fuse(s), and recheck.
2. Disconnect the heater control panel 22P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 2 terminal of
the heater control panel 22P connector and body
ground.
HEATER CONTROL PANEL 22P CONNECTOR
BLK/YEL
Wire side of female terminals
Is there battery voltage?
YES Go to step 5.
NO Repair open in the wire between the No. 3
fuse in the driver's under-dash fuse/relay box and
the heater control panel.
5. Turn the ignition switch OFF.
21-26
6. Measure the voltage between the No. 3 terminal of
the heater control panel 22P connector and body
ground.
HEATER CONTROL PANEL 22P CONNECTOR
WHT/YEL
Wire side of female terminals
Is there battery voltage?
YES Go to step 7.
NO Repair open in the wire between the No. 13
fuse in the passenger's under-dash fuse/relay box
and the heater control panel.
7. Check for continuity between the No. 9 terminal of
the heater control panel 22P connector and body
ground.
HEATER CONTROL PANEL 22P CONNECTOR
Wire side of female terminals
Is there continuity?
YES Check for loose wires or poor connections at
the heater control panel 22P connector. If the
connections are good, substitute a known-good
heater control panel, and recheck. If the symptom/
indication goes away, replace the original heater
control panel.
NO Check for an open in the wire between the
heater control panel and body ground. If the wire is
OK, check for poor ground at G401.
BLK