When a Bora 1.6L manual transmission cars, traveling to more than 10,000 km, due to an accident causing damage to the dashboard. Owners request a replacement instrument panel assembly, has been replaced, but the emergence of anti-theft alarm lamp lit only immortal, after starting it only lasted 2s flame failure. However, even before the replacement vehicle was able to start normally.
Volkswagen Bora sedan uses a third-generation anti-theft system, which is dominated by a combination of instruments embedded in anti-theft system control unit, a combination of anti-theft warning light meter K117 (located on the instrument cluster speedometer), matching the multidiag engine control unit ignition coil switch on the identification and matching with D2 transmitting / transponder ignition key composition. Under normal circumstances, turn the ignition switch, electronic immobilizer anti-theft alarm light on the instrument cluster will illuminate after K117 3s off. If a failure occurs, such as the following: the ignition key fit correctly; without sending / transponder inside the ignition key; ignition key without authorization; engine control unit without authorization; identify faulty coil D2 or faulty data cable, etc., turn the ignition switch after, burglar alarm light will blink or stays on K117.
Analysis of vehicle faults that vehicles entering the security state, mainly because no new instruments in the anti-theft system control unit caused by match. Access to information, to know if the new instruments are VDO production company, from time to time to match the password, and enter a fixed code 13861. Data entered by the methods described in this fixed code, but still can not start. The unit is not an authorized special maintenance station, the public is not entitled to the original data and the corresponding technical support, so I can not know their own data entry error or a wrong, so maintenance trouble.
Repeatedly thinking, since the original instrument can be started, but can not start a new instrument, which shows that the old meter anti-theft system control unit is not damaged. Unpack the original instrument to find a model for the 93C86 8-pin chip. At this point, I whim, can sound like anti-theft solution as the Renault can clip V139 replacement chips? So after cutting the two instruments in the exchange of old chips. After refitted, still can not start. Apart again, but found that due to the negligence of the upper and lower legs welded obvious sign of backwards. At this point, I think it may come to naught under the chip will burn no doubt, but still holding the dead horse a living horse medicine idea, the next chip re-welding, weld and refitted correctly, unexpectedly turned out to be able to start a. By using a chip inside the original instrument, the password is not changed, it is still more than 10,000 kilometers km. The use of more than 1 year, this failure never occurs again.
Through the above troubleshooting process, we can see that for a similar situation like the Passat B5, Audi A6 and other vehicles encountered and some of the sound with an antitheft device, we can by analogy, using the same method to solve. It also allows insight into the author, in the repair process, encountered in the case of the external environment is not allowed (eg no causes of passwords, equipment and technical information, etc.), we have to use the experience accumulated in peacetime, broaden thinking solve the problem. Some may seem impossible, but also through a thorough understanding of the principles, boldly practice to verify, and sometimes you will receive unexpected results.