Test point

Wrong key or wrong transponder pill Fault code 42

1. Check transponder for presence in the key.

2. Wrong transponder - not adapted to the vehicle - teach the transponder.

3. Check the control lead for the signal converter (pin 6) to the alarm system control module plug I pin 4 for open circuit, short to ground and short to B+.

Pull plug I off the alarm system control module

Voltmeter at alarm system control module plug I pin 4 and ground

Ohmmeter at alarm system control module plug I pin 4 and ground

Ohmmeter at alarm system control module plug I pin 4 and signal

4. Check the control lead for the signal converter (pin 8) to the alarm system control module plug I pin 3 for open circuit, short to ground and short to B+.

Pull plug I off the alarm system control module

Voltmeter at alarm system control module plug I pin 3 and ground

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