Honda 2004 Odyssey Service Manual page 2047

Navigation System
Symptom Troubleshooting (cont'd)
Display unit buttons do not work
NOTE:
• Always check the connectors for poor connections or
loose terminals.
• Before troubleshooting, get the navigation system
anti-theft codes.
• After troubleshooting, enter the navigation system
anti-theft codes.
1. Turn the ignition switch to ACC (I).
2. Measure the voltage betwen body ground and
display unit connector B (20P) terminals No. 1 and
No. 2 individually.
DISPLAY UNIT CONNECTOR B (20P)
B
(WHT/BLU)
ACC (WHT/RED)
Wire side of female terminals
Is there battery voltage?
YES Go to step 3.
NO Repair open in the wire between the
passenger's under-dash fuse/relay box and the
display unit.
3. Check for continuity between display unit
connector B (20P) terminal No. 10 and body ground.
DISPLAY UNIT CONNECTOR B (20P)
Wire side of female terminals
Is there continuity?
YES Go to step 4.
NO Repair the open in the wire between the
display unit and body ground (G501).
4. Turn the ignition switch OFF.
22-368
5. Disconnect the navigation unit and display unit
6. Check for continuity between the display unit
7. Check for continuity between body ground and
GND
(BLK)
connectors.
connector B (20P) terminal No. 14 (for the harness)
shield and terminals No. 5 and No. 15 (for the DISP
BUS) individually.
DISPLAY UNIT CONNECTOR B (20P)
DISP BUS ( ) (BLU/GRN)
DISP BUS ( )
(ORN/BLU)
SH DISP BUS
(LT BLU)
Wire side of female terminals
Is there continuity?
YES Replace the affected shielded harness.
NO Go to step 7.
display unit connector B (20P) terminals No. 5 and
No. 15 individually.
DISPLAY UNIT CONNECTOR B (20P)
DISP BUS ( ) (BLU/GRN)
DISP BUS ( )
(ORN/BLU)
Wire side of female terminals
Is there continuity?
YES There is a short to body ground in the circuit
between the display unit and the navigation unit.
Replace the affected shielded harness.
NO Go to step 8.