Diagnostic Aids

WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

The transmitter response for both active and passive functions is received by the external RF antenna located in the back glass. There is a coax that connects the back glass antenna to the RCDLR. If this connection is poor, both active and passive functions could be affected. That is, the customer may notice intermittent NO FOB DETECTED incidents, poor range when remote starting the vehicle, or even issues with the tire pressure monitoring system.

A low transmitter battery or radio frequency (RF) interference from aftermarket devices such as 2-way radios, power inverters, cellular phone chargers, computers, etc. may cause a system malfunction. High RF traffic areas, such as gas stations which use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction.

Conditions caused by external influences such are these are considered to be normal. Following this diagnostic will not diagnose an RF interference condition. If RF interference is suspected, question the customer about the conditions or location where the NO FOB DETECTED condition occurs.