Pinpoint Test D: Diagnosing Radio Frequency Interference Faults: Notes

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 or BCM can all present symptoms that are similar to RFI.

Possible Sources

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