Initial Inspection and Diagnostic Overview
INSPECTION AND VERIFICATION1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical and electrical damage.
VISUAL INSPECTION CHART
Electrical
- Battery junction box (BJB) fuse 3 (60A)
- Damaged wiring harness
- Loose or corroded connector(s)
- Circuitry
- Smart junction box (SJB)
3. If an obvious cause of an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
6. Carry out the data link diagnostics test. If the diagnostic tool responds with:
- ISO or CAN circuits fault; all electronic control units no response/not equipped, refer to Module Communications Network (Information Bus).
- No response/not equipped for SJB, GO to Pinpoint Test A. Pinpoint Tests
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the SJB.
7. If the DTCs retrieved are related to the concern, go to the Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Descriptions
8. If no DTCs related to the concern are retrieved, refer to the appropriate Vehicle System to continue diagnostics.