Inspect for aftermarket accessories (non-OEM) as the first step in diagnosing electrical concerns. Inquire with the customer if the condition occurs when an accessory is in use.
Possible causes of vehicle conditions related to aftermarket accessories include:
| • | Power and ground circuits connected to terminals other than the battery |
| • | Accessory wiring spliced into the ECM wiring harness |
| • | Transceiver wiring located too close to control modules or wiring |
| • | Poor shielding or poor connectors on antenna cable |
