Pinpoint Test 3: The Position Cursor Is Inaccurate

PINPOINT TEST 3: THE POSITION CURSOR IS INACCURATE

Normal Operation

The primary source of vehicle location for the navigation system is the audio control module (ACM) receiving the position signal through the global positioning system (GPS) antenna.In addition, the ACM receives the rolling wheel count signal from the instrument cluster (IC) (which gateways the signal from the ABS module). This secondary signal is used to calculate vehicle position when the GPS signal is lost. It also supports the adaptive learning function of the ACM, whereby the ACM can compensate for long-term differences between the GPS signal location, and the actual distance traveled by the vehicle.If DTC B119F:01 or DTC B119F:13 is present, see Pinpoint Test 1: No Global Positioning System (GPS) Antenna Signal to diagnose a concern with the GPS antenna.

- DTC U0155:00 (Lost Communication With Instrument Panel Cluster [IPC] Control Module) - sets when the ACM is missing the navigation rolling wheel count message from the IC for greater than 5 seconds. An error message should be displayed on the navigation screen if this signal is missing.

Possible Causes
- GPS antenna concern
- Communication network concern
- ACM

Diagnostic Procedure

Step 1-Step 4:

Step 5: