Check for resistance between No. 1 and No. 4 terminals in each switch position.
Courtesy of HYUNDAI MOTOR CO. SWITCH RESISTANCE SPECIFICATIONS
| Switch |
Connector terminal |
Resistance (+/-5%) |
| VOLUME DOWN |
1 - 4 |
6.81 kΩ |
| VOLUME UP |
1 - 4 |
4.61 kΩ |
| SEEK UP |
1 - 4 |
430 Ω |
| POWER ON/OFF |
1 - 4 |
100 Ω |