Inspection and Verification

Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

VISUAL INSPECTION CHART

Mechanical	Electrical
Horn Horn switch (part of the steering wheel)	Battery junction box (BJB) fuse 5 (50A) Smart junction box (SJB) fuse 13 (15A) Circuitry Clockspring BJB SJB

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the cause is not visually evident, connect the WDS or equivalent tester to the data link connector (DLC) and select the vehicle to be tested from the WDS or equivalent tester menu. If the WDS or equivalent tester 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.
If the WDS or equivalent tester still does not communicate with the vehicle, refer to the WDS or equivalent tester operating manual .
Carry out the WDS or equivalent tester data link test. If the WDS or equivalent tester responds with:
- SCP, CAN or ISO circuits fault; ail electronic control units no response/not equipped, see COMMUNICATIONS NETWORK .
- No response/not equipped for the SJB, see MODULE CONTROLLED FUNCTIONS .
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the SJB.
If the DTCs retrieved are related to the concern, see SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
If no DTCs related to the concern are retrieved, see SYMPTOM TROUBLESHOOTING CHART - HORN .