Do not connect aftermarket accessories into the following circuits:
Warning: Refer to SIR Warning in the Preface section.
| • | SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol. |
| • | Always check for aftermarket accessories as the first step in diagnosing electrical conditions. If the vehicle is so equipped, disconnect the aftermarket system to verify that these add-on accessories are not the cause of the customer concern. |
Possible causes of vehicle conditions related to aftermarket accessories include:
| • | Power feeds connected to points other than the battery. |
| • | Transceiver wiring located too close to vehicle electronic modules or wiring. |
| • | Poor shielding or poor connectors on antenna feed line. |
| • | Check for recent service bulletins detailing installation guidelines for aftermarket accessories. |
