Check the steering remote control switch (A) for resistance between terminals in each switch position.

| Switch | Connector terminal | Resistance(± 5%) | 
| Seek up | 3-4(RH) | 430 Ω | 
| Seek down | 3-4(RH) | 1.11 kΩ | 
| Mode | 3-5(LH) | 2.11 kΩ | 
| Volume up | 3-5(LH) | 4.61 kΩ | 
| Volume down | 3-5(LH) | 6.81 kΩ | 
| Voice | 3-5(LH) | 10.71 kΩ | 
| END | 3-6(RH) | 18.91 kΩ | 
| SEND | 3-6(RH) | 40.91 kΩ |