Checking Aftermarket Accessories
Warning: Refer to
SIR Warning .
|
Caution: 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. |
Do not connect aftermarket accessories into the following
circuits:
• |
SIR circuits, all such
circuits are indicated on circuit diagrams with the SIR
symbol. |
• |
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. |
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