Inspection-4. Check The Trunk Unlock Output Circuit For An Open/Short Circuit
WARNING: This page is about a different car, the 2019 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the positive (+) probe of the voltmeter to the tailgate output and ground circuits and the negative (-) probe to the vehicle body.
- Measure voltages of the circuits while actuating the trunk unlock.
Reference values: Output circuit → battery voltage/Output ground circuit → 0 V
NOTE: Before measuring voltages and waveforms, first check the connection of the relevant connectors. - Is the measured voltage value normal?
Yes
- Inspect/replace the "trunk lid latch."
No
- Inspect the wiring (connector) where an abnormal voltage is measured. Repair the wiring if a problem is found.
Information
(Inspect the SJB if there is no problem with the wiring.)
B-CAN communication line inspection process
- Turn on the engine
- Check the B-CAN High and Low terminals in the SJB
- Connect the diagnostic tool (KDS) probes to the High and Low terminals, and measure the waveforms
* Compare to the normal CAN waveforms to determine the communication quality.
(What to check: waveform symmetry, noise, max/min values, etc.)