Do not connect aftermarket accessories into the following circuits:
Caution: Refer to SIR Caution in the Preface section.
| • | SIR circuits, all such circuits are indicated on circuit diagrams
with the SIR symbol. |
Notice: The OBD II symbol is used on the circuit diagrams in order
to alert the technician that the circuit is essential for proper OBD II emission
control circuit operation. Any circuit which fails and causes the malfunction
indicator lamp (MIL) to turn ON, or causes emissions-related component damage,
is identified as an OBD II circuit.
| • | 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. |
