Part 4
Navigation System Diagnostic Mode
Yaw Rate
This diagnosis checks the yaw rate sensor in the audio-navigation unit. This device detects when the vehicle turns, and repositions the vehicle position icon on the map screen. For more detailed information, see the yaw rate sensor theory of operation under System Description.
- Sensor indicates the voltage output from the yaw rate sensor. It should indicate about 2.300 V-2.700 V when the vehicle is stopped.
- Offset is the reference voltage or standard within the yaw rate sensor. It also should indicate about 2.300 V-2.700 V when the vehicle is stopped.
- A sensor output voltage HIGHER than the Offset voltage indicates that the vehicle is turning to the right.
- A sensor output voltage LOWER than the Offset voltage indicates that the vehicle is turning to the left.
- The yaw rate offset, and sensor should both indicate about 2.300 V-2.700 V when the vehicle is stopped. If either reads below 2.300 V, or above 2.700 V, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.
- The yaw rate offset and sensor should be within +/-0.01 V of each other when the vehicle is stopped. The sensor value should change relative to the offset as the vehicle turns while driving. If not, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.
Example: Car stopped
Example: Car turning
- The settings CCW Cal Factor, CW Cal Factor, and Set are for factory use only. THIS SHOULD NEVER BE ADJUSTED.
- For detailed analysis of the yaw rate select tuning.
Yaw Rate Tuning
This diagnosis allows you to graphically display problems with the yaw rate sensor.
- The ANG-Disp value accumulates any differences between the offset, and sensor voltages (see Yaw Rate diagnostic). When the sensor functions normally, the random changes in these two voltages generally cancels out, so the value is 0. However if one voltage is consistently higher than the other, then the ANG-Disp value accumulates the constant change.
- The Reset button temporarily clears the angular accumulation (ANG-Disp), and clears the display dots.
- Do not touch the CCW, CW, or Set buttons. These are used for factory setup only.
Two tests are explained below. For gross problems with the sensor, the stationary test usually confirms whether the sensor is defective. For yaw rate issues related to driving, do the road test described below.
1. Stationary test: If the VP icon spins with the vehicle parked and the engine running and the ANG-Disp value slowly increases or decreases, the yaw rate sensor is defective. Replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.
2. Road test: Drive the vehicle on a very straight, smooth road. Enter the diagnostic mode, select Yaw rate, and touch the Tuning button. While driving down a straight road, the white dots should trace a straight line across the screen. However, if you are driving on a straight road, and you notice the dots constantly dropping down or heading up as you drive, the audio-navigation unit's yaw sensor is defective. To run the test again, touch Reset to clear ANG-Disp, and the dotted lines.
If either test above fails, please enter Yaw rate sensor defective for the problem description, on the audio-navigation unit return form.
NOTE: The CCW, CW and Set buttons are disabled and cannot be activated.
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 (1) are 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. 15)
a) OFF (0) when vehicle is not moving
b) 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 H (28P) terminal No. 20)
a) OFF (0) when the shift lever is in any position other than reverse
b) 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.
- ILL-Illumination Indication(audio-navigation unit connector H (28P) terminal No. 4)
a) OFF (0) when parking lights, or headlights are off
b) ON (1) when parking lights, or headlights are on
The navigation uses the signal to determine whether to put the navigation screen into the Day or Night brightness mode. (Setup screen 1)
NOTE:
- The PARK on this diagnostic screen in this models always shows [-].
- You will not see this display when you shift into R because the screen displays the rearview camera image.
Error History
Refer to How to Check for Error History to use this diagnosis.
Version
This screen shows the current version information for the navigation system software. In addition, this screen allows the loading of updated software if requested by the factory, or instructed by a service bulletin. Software may be loaded from a DVD or a USB device.
- Flash: Displays the version of the navigation software in memory.
- HDD: Displays the version of the navigation software in the navigation HDD.
- USB: If displayed, this value represents the version of the USB software in the USB device.
- Disc: If displayed, this value represents the version of the navigation software on the navigation DVD.
- DSP: Displays the version of the DSP firmware.
- IPL, APL, DBOOT, HDD, and APP, are all for factory use.
- Model: For this model, the field should begin with SZN.
- Download: Do not touch, unless instructed by the factory or any other official Honda service information (like a service bulletin).
Check any official Honda service website for more service information about the navigation system.
Error Message Table
