Test C: The Navigation System Does Not Operate Correctly - No Speedometer Signal

PINPOINT TEST C: THE NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - NO SPEEDOMETER SIGNAL

C1-C3:

C4:

Normal Operation
The audio unit monitors the vehicle speed through circuit 679 (GY/BK).

Possible Causes
- circuit 679 (GY/BK) open or short to ground
- anti-lock brake system (ABS) module
- audio unit