Pinpoint Test D : Diagnosing Radio Frequency Interference Faults: Notes

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions

REFER to: Tire Pressure Monitoring System (TPMS) - System Operation and Component Description .

One or more TPMS sensors not being trained or missing, RTM wiring and BCM wiring, or an internal failure of the RTM, GWM or BCM can all present symptoms similar to RFI.

Possible Sources

Wiring, terminals or connectors
Not all TPMS sensors are installed
TPMS sensor(s) not trained
TPMS sensor(s)
Intermittent TPMS operation due to RFI
RTM
GWM
BCM

Visual Inspection and Diagnostic Pre-checks

Inspect for customer electronic devices, such as a cell phone charger or GPS unit.
Inspect for aftermarket wheels or run-flat tires (tires with steel body cord plies in the tire sidewall).
Verify horn operation

NOTE: Make sure that all aftermarket electronic equipment has been disconnected (if possible) and the customer has been questioned about the electronic equipment they may have been using in the vehicle when this concern was identified.