Acura RL (1996-2004 year). Manual — part 296
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. Go into the Diagnostic mode and use "Touch Panel"
diagnostic under Monitor Check (see page
and, if necessary, "Display" diagnostic under Unit
Check (see page
).
Do the buttons work properly?
YES—System is OK.
NO—Go to step 3.
3. Measure the voltage between body ground and dis-
play unit connector B (20P) terminal No. 1 and No. 2
individually.
DISPLAY UNIT CONNECTOR B (20P)
+B
(WHT/YEL) ACC (WHT/YEL)
Wire side of female terminals
Is there battery voltage?
YES—Go to step 4.
NO—If the + B wire does not have voltage, repair the
open in the wire between the under-hood fuse/relay
box and the display unit. If the ACC wire does not
have voltage, repair the open in the wire between the
under-dash fuse/relay box and the display unit.
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- +
BODY
4. Turn the ignition switch OFF.
5. Disconnect the display unit connector B (20P).
6. Check for continuity between display unit connector
B (20P) terminal No. 1 0 and body ground.
DISPLAY UNIT CONNECTOR B (20P)
Wire side of female terminals
Is there continuity?
YES—Go to step 7.
NO—Repair the open in the wire between the display
unit and body ground (G251).
7. Disconnect the navigation unit connector A (20P).
8. Check for continuity between body ground and dis-
play unit connector B (20P) terminal No. 5 and No. 1 5
individually.
DISPLAY UNIT CONNECTOR B (20P)
DISP BUS {+)
(BLK)
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 9.
9. Check for continuity between display unit connector
B (20P) terminal No. 5 and navigation unit connector
A (20P) terminal No. 10.
DISPLAY UNIT CONNECTOR B (20P)
DISP BUS {+} (BLK)
Wire side of female terminals
Is there continuity?
YES—Go to step 10.
NO—There is an open in the circuit between the dis-
play unit and the navigation unit. Check for poor con-
nections or loose terminals at the display and naviga-
tion units. If a poor connection or loose terminal is
found, replace the affected shielded harness.
(cont'd)
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Navigation System
Symptom Troubleshooting (cont'd)
10. Check for continuity between display unit connector
B (20P) terminal No. 15 and navigation unit connec-
tor A (20P) terminal No. 20.
Wire side of female terminals
Is there continuity?
YES—Replace the display unit (see page
).
NO—There is an open in the circuit between the dis-
play unit and the navigation unit. Check for poor con-
nections or loose terminals at the display and naviga-
tion units. If a poor connection or loose terminal is
found, replace the affected shielded harness.
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Navigation System
Symptom Troubleshooting (cont'd)
GPS icon is white
Diagnostic Test: Navigation System Link
NOTE:
• Make sure the vehicle is parked outside and away
from buildings.
• Refer to GPS information (see page
) for real-
time satellite reception display.
Before assuming that a GPS antenna reception com-
plaint is hardware related, be aware of the following:
• The GPS signal is extremely weak (about one bil-
lionth the strength of a radio broadcast signal
received by a radio antenna)
• If the rear window has been tinted with metallic
tint, this can seriously degrade or block GPS
reception.
• Loose items on the rear shelf can block satellite
antenna reception.
• Aftermarket devices like Lo-Jack, remote starters
or other electronic devices located near the navi-
gation unit or GPS antenna can potentially inter-
fere with the operation of the navigation and On-
Star systems.
1 . Check for electronic aftermarket accessories (possibly
hidden) mounted near the GPS antenna or the navi-
gation unit.
Are there any electronic accessories?
YES—Disable the accessories and recheck,
NO—Go to step 2.
2. Go into the Diagnostic mode and use the "Navi
System Link" diagnostic (see page
) to check
the GPS antenna.
Is "GPS Ant" icon red?
YES—Use the "Navi ECU" diagnostic under Unit
Check (see page
) to check for a kinked, crushed,
or disconnected GPS antenna wire. If icon is still red,
replace the GPS antenna.
NO—Check that nothing is blocking the GPS antenna
located under the rear shelf and recheck. Substitute
a known-good navigation unit, and recheck.
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