Hyundai Sonata: Troubleshooting

Troubleshooting

1.	The lamp switch inputs can be checked using the GDS.

2.	To check the input value of lamp switch, select option "Body Control Module".

3.	To consult the present input/output value of BCM, "Current DATA". It provides information of BCM input/output conditions of power supply, turn signal/brake lamp, headlamp, door, locks, outside mirror, wiper, auto-light and transmitters etc.

4.	To check the input value of lamp switch in force mode, select option "Actuation Test of smart junction box".

Symptom	Possible cause	Remedy
One lamp does not light (all exterior)	Bulb burned out	Replace bulb
One lamp does not light (all exterior)	Socket, wiring or ground faulty	Repair if necessary
Stop lamps do not light	Bulb burned out	Replace bulb
	Stop lamp fuse (15A) blown	Check for short and replace fuse
	Stop lamp switch faulty	Adjust or replace switch
	Wiring or ground faulty	Repair if necessary
Stop lamps do not turn off	Stop lamp switch faulty	Repair or replace switch
Instrument lamps do not light (Tail lamps light)	Rheostat faulty	Check rheostat
Instrument lamps do not light (Tail lamps light)	Wiring or ground faulty	Repair if necessary
Back up lamps do not light	Bulb burned out	Replace bulb
	Back up lamp fuse (10A) blown	Check for short and replace fuse
	Back up lamp switch (M/T) faulty	Check switch
	Transaxle range switch (A/T) faulty	Check switch
	Wiring or ground faulty	Repair if necessary
Map lamp does not light	Bulb burned out	Replace bulb
	Room lamp fuse (10A) blown	Check for short and replace fuse
	Map lamp switch faulty	Check switch
	Wiring or ground faulty	Repair if necessary
Luggage room lamp does not light	Bulb burned out	Replace bulb
	Trunk lamp fuse (10A) blown	Check for short and replace fuse
	Luggage room lamp switch faulty	Check switch
	Wiring or ground faulty	Repair if necessary

Removal 1. Disconnect the negative (-) battery terminal. 2. Remove the rear combination lamp cover (A). 3. ...

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