Pinpoint Test L: The Position Cursor Is Inaccurate
Information and Entertainment System
Pinpoint Tests
Pinpoint Test L: 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 navigation 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.
- DTC B2204 (GPS Antenna Connection Open or Short) - sets when an open, short to ground, or short to voltage is detected in the GPS antenna circuit. If DTC B2204 is present, Go To Pinpoint Test H. Pinpoint Test H: No Global Positioning System (GPS) Antenna Signal
- DTC U0155 (Lost Communication With Instrument Panel Cluster [IC] Control Module) - sets when the navigation rolling wheel count signal is lost for greater than 5 seconds. When the signal is lost, DTC U2473 should also be set. If no symptoms are present and DTC U2473 is not present, this DTC can be ignored, as it may have been set by a low battery voltage condition.
- DTC U2473 (Unexpected Vehicle Speed) - sets when the calculated vehicle distance traveled based on the navigation rolling wheel count signal does not agree with the GPS antenna location. To do this, the ACM monitors the navigation rolling wheel count signal during a 4-second range, and compares it with the change in GPS antenna location. If the ACM finds that the variation is greater than 0.5% after carrying out this check 4 times, it sets DTC U2473.
This pinpoint test is intended to diagnose the following:
- Vehicle Speed Sensor (VSS) signal concern
- ACM
PINPOINT TEST L: THE POSITION CURSOR IS INACCURATE
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L1 CHECK THE ACM DTCs
- Review the DTCs from the ACM self-test.
- Is DTC U2473 present?
Yes
GO to L2.
No
Go To Pinpoint Test H. Pinpoint Test H: No Global Positioning System (GPS) Antenna Signal
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L2 CHECK THE IC AND ABS MODULE DTCs
- Carry out the self-test for the IC and the ABS module.
- Are any DTCs recorded?
Yes
REFER to Instrument Panel, Gauges and Warning Indicators (IC) or
Antilock Brakes / Traction Control Systems (ABS module) to diagnose a fault in the navigation rolling wheel count signal. Testing and Inspection
No
GO to L3.
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L3 CHECK FOR CORRECT ACM OPERATION
- Disconnect all the ACM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new ACM. REFER to Audio Control Module (ACM) Removal and Replacement. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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