Acura TSX / Honda Accord CL. Manual - part 177

Fig. 73: Navi ECU Display 

PC Card info 

Normally there is no PC Card in the PC slot, and the screen should say, "PC Card is not inserted". 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Navigation System - TSX

  

 

Fig. 74: PC Card Info Display (PC Card is not inserted)

If the factory instructs you to insert a card, then this screen displays the Manufacturer, and Product Name as 
shown in the following screen. 

Fig. 75: PC Card Info Display (Manufacturer And Product Name) 

Car Status 

This screen is used to confirm that navigation unit is properly receiving input signals. Signals equal to (0) are 
OFF, and signals equal to (1) are ON. If the value on the display does not match the actual vehicle status, then 
check the wire carrying the signal. 

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CHG-(OBSELETE-NOT USED) Charge indicator (Pin 3 of C-Connector) 

a) OFF (0) when engine is off, or alternator is not charging 

b) ON (1) when engine is running 

This signal was used by the previous DVD navigation system. If CHG was off, then the screen was shut off 
after 10 minutes of inactivity to minimize battery consumption. 

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VSP-Vehicle Speed Pulse from PCM (Pin 6 of C-connector) 

a) OFF (0) when vehicle is not moving

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Navigation System - TSX

  

 

b) ON (1) when vehicle is moving 

The VSP comes from the PCM as a dedicated signal. Internally, the navigation unit compares the actual VP on 
the map against street data to adjust the pulse to speed scaling factor. As this scaling factor becomes more 
accurate, the "Level" gradually increases from 0 to 10. 

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BACK-Reverse indication from taillight relay (Pin 5 of C-connector) 

a) OFF (0) when shift lever is in any position other than reverse 

b) ON (1) when shift lever is in reverse 

The Back signal is used by the navigation unit to allow the map screen to show the VP moving backwards when 
in reverse. This signal is needed because the Speed Pulse has no direction indication. 

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CHG (CAN)-Charge indicator from PCM using F-CAN bus (Pin 8, 18 of navigation unit A-connector) 

a) OFF (0) when engine is off 

b) ON (1) when engine is running 

This signal is obtained off of the F-CAN bus. For problems, see the service manual section for troubleshooting 
F-CAN. Diagnostic trouble codes (DTCs) for the F-CAN can be retrieved with a PGM Tester or a HDS (Honda 
Diagnostic System). 

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ILL-Illumination Indication (Pin 5 of navigation unit A-connector) 

a) OFF (0) when parking lights, or headlights are off 

b) ON (1) when parking lights, or headlights are off 

This signal is used by the navigation unit to determine whether to put the navigation screen into the Day or 
Night brightness mode. (Setup screen 1) 

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DVD Lid-senses if DVD door is open 

a) (Close) when door is closed 

b) (Open) when door is open 

The navigation unit has a micro switch to detect this. If open is indicated when the door is closed, replace the 
navigation unit. 

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PC Card Lid-Senses if PC Card door is open 

a) (Close) when door is closed 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Navigation System - TSX

  

 

b) (Open) when door is open 

The navigation unit has a micro switch to detect this. If open is indicated when the door is slid shut, then replace 
the navigation unit. This slot is for insertion of PC Flash memory cards for gathering diagnostic information. 
This is for factory use only. 

Fig. 76: Car Status Display 

GPS Information 

This screen shows the current status of GPS reception. The circular diagram shows the current location of the 
GPS satellites (yellow numbers) as they would appear in the sky. The outer circle represents the horizon (0 
degrees elevation). The middle and inner circles represents 30 and 60 degrees respectively. The very center of 
the diagram (90 degrees elevation) is directly overhead. Naturally, nearby obstructions, like tall buildings will 
block satellites in that direction. That is why it is necessary to be in an open area to effectively troubleshoot 
GPS reception issues. 

The satellite numbers shown on the diagram correspond to the "PRN" number in the "GPS Details" screen. 
There are always 24 "active" GPS satellites in orbit. Because satellites fail, and have to be removed from 
service, spares always parked in orbit, ready to be activated. This is why the PRN (satellite ID number) can be 
greater than 24. 

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The "Number of Satellites" box shows the number of acquired satellites (maximum of 12). It should 

NOTE:

To use this screen for troubleshooting, the vehicle should be out side away 
from buildings, tall trees, and high-tension wires for at least 10 minutes with the 
engine running.

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Navigation System - TSX