Test Point 41

TEST POINT 41
Wrong Key Or Wrong Transponder Pill

Fault Code 42

Fault Effect: No engine start possible

Procedure

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

Pull plug off the signal converter

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

Display: 0 Volts

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

Display: infinity

- Ohmmeter at alarm system control module plug I, pin 4 and signal converter plug pin 6

Display: < 5 ohms

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

Pull plug off the signal converter

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

Display: 0 Volts

- Ohmmeter at alarm system control module plug I, pin 3 and ground

Display: infinity

- Ohmmeter at alarm system control module plug I, pin 3 and signal converter plug pin 8

Display: < 5 ohms

If no faults are detected in the wire, replace the signal converter.