Charging Circuit Troubleshooting - Honda 2004 Odyssey Service Manual

Charging System

Charging Circuit Troubleshooting

If the charging system indicator does not come on or
does not go off, or the battery is dead or low, test the
following items in the order listed:
Battery (see page 22-87)
Charging system indicator
Alternator/regulator circuit
Alternator control system
Charging System Indicator Test
1. Turn the ignition switch ON (II).
Does the charging system indicator come on?
YES Go to step 2.
NO Go to step 6.
2. Start the engine.
Does the charging system indicator go of f ?
YES Charging system indicator circuit is OK. Go
to Alternator and Regulator Circuit Test.
NO Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect the alternator 4P connector from the
alternator.
5. Turn the ignition switch ON (II).
Does the charging system indicator come on?
YES Turn the ignition switch OFF, and repair the
short in the WHT/BLU wire. If the WHT/BLU wire is
shorted to ground, the voltage regulator in the
alternator may be damaged.
NO Go to step 9.
6. Turn the ignition switch OFF.
7. Disconnect the alternator 4P connector from the
alternator.
4-22
8. Connect the alternator 4P connector terminal No. 3
to body ground with jumper wire. Turn the ignition
switch ON (II).
ALTERNATOR 4P CONNECTOR
L (WHT/BLU)
Does the charging system indicator come on?
YES Go to step 9.
NO Turn the ignition switch OFF. Check for a
blown No. 6 (15A) fuse and a blown charging
system light bulb. If the fuse and bulb are OK,
repair the open in the BLK/YEL or WHT/BLU wire to
the indicator bulb.
9. Measure the voltage at the No. 1 terminal of the
alternator 4P connector with the ignition switch ON
(II).
ALTERNATOR 4P CONNECTOR
IG (BLK/YEL)
Is there battery voltage?
YES Go to Alternator and Regulator Circuit
Test.
NO Repair an open in the BLK/YEL wire between
the alternator and the under-dash driver's fuse
relay box.
Wire side of
female terminals
Wire side of
female terminals