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

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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