Do not connect aftermarket accessories into the following circuits:
Caution: Refer to SIR Warning in the Preface section.
| • | SIR circuits--All such circuits are indicated on circuit diagrams with the SIR symbol. |
Caution: Refer to OBDII Symbol Description Caution in the Preface section.
| • | OBD II circuits-- All such circuits are indicated on circuit diagrams with the OBD II symbol. |
Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.
Possible causes of vehicle problems 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. |
