Instrument solar lights don't why

Models: jetta GIX

mileage: 5300 km

failure phenomenon: when night lights, instrument lights lit at the same time, when suddenly go out.

fault inspection: the car service station is on the second day morning, pick up car, make after into the workshop, the first lighting the fuse for instrument examination, found no ablation, and then to measure instrument lighting wiring harness, headlight switch in electric wire, open the headlight switch a block for lighting, found the line without electricity. Judgment, therefore, the line without electricity only two possibilities: one for the headlight switch is damaged, secondly, instrument lighting wire grounding short circuit. After the first try in the headlight switch instrument is not bright, the fault has not ruled out, demonstrating instrument wire and ground wire short circuit. Where is the short circuit? First remove the dashboard, instrument from the headlight switch lighting wiring harness to the dashboard to find any iron point, when pull the wire behind the dashboard, instrument lights all light, it has access to radio and air conditioning panel wiring harness, and remove the CD machine ( The vehicle modified CD) And found a blue gray line instrument flare path has been cut, check again carefully, the bolt as radio lights line, the line, will remove the components installed after the commissioning, troubleshooting.

failure analysis: this car CD, due to the lighting in the CD machine controlled by CD machine Lord of fire, open the CD machine by a light is bright, not from the headlight switch, instrument control lighting wiring harness, so the fault is by the instrument, lighting wire was cut out without using insulation materials, lead to iron, instrument light not on. ( Wen/ZhaiWenTao)