Differences between the signals indicated and those specified may be due to interference from a control unit connected to the K and L wires (see wiring diagram for systems capable of diagnosis). Disconnect connectors from the control units in turn and repeat checks of K and L wires. Start with the alarm control unit as described below. When the last control unit has been disconnected, at least one of the units disconnected must be connected up again. Otherwise, there will be no signal.

4) Disconnect alarm control unit and place jumper in position

Disconnect connector 1 (black) from alarm control unit. Place jumper on pins 4 and 6 of connector 1 of alarm control unit.

Check K wire and L wire again as described above.

5) Disconnect next control unit.

Turn ignition on, switch Tester off and on and start diagnosis (by provoking faults). Check signals on K and L wires. Repeat this procedure until all the control units have been disconnected.

6) Check K and L wires for shorts to ground.

7) Check each control unit for continuity to diagnosis socket.


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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