Car Status

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

• VSP-Vehicle Speed Pulse from PCM (audio-navigation unit connector A (24P) terminal No. 23)
  1. OFF (0) when vehicle is not moving
  2. ON (1) when vehicle is moving

The VSP comes from the PCM as a dedicated signal. Internally, the audio-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.

• BACK-Reverse indication from taillight relay (audio-navigation unit connector C (28P) terminal No. 23)
  1. OFF (0) when the shift lever is in any position other than reverse
  2. ON (1) when the shift lever is in R position

The BACK signal is used by the audio-navigation unit to allow the map screen to show the VP moving backwards when the vehicle is in R position. This signal is needed because the Speed Pulse has no direction indication.

Fig 1: Diagnostic Screen Display - Car Status

Courtesy of AMERICAN HONDA MOTOR CO., INC.

• ILL-Illumination Indication
  1. OFF (0) when parking lights, or headlights are off
  2. ON (1) when parking lights, or headlights are on

The illumination indication comes from the gauge control module to the audio-navigation unit via the B-CAN bus.

The navigation uses the signal to determine whether to put the navigation screen into the Day or Night brightness mode (Setup screen 1).