Communication Line Test

Communication Line Test
1. Continuity Test
Check for continuity according to the table.
- If there is continuity, go to step 2.
- If there is no continuity, check for an open in the wire

2. Voltage Test
A. Turn the ignition switch ON (II).





B. Check for voltage between communication line and ground:
The voltage should match the following table.

* If the voltage is too high:
A. Check for short to another wire.
B. Check for poor contact at the connector on the receiver side unit.
C. Faulty circuit in the receiver side unit.
* If the voltage is too low:
A. Check for short to ground or to another wire.
B. Check for poor contact at the connector on the transmit side unit.
C. Faulty circuit in the transmitter side unit.

* If any control units appears to be faulty, select one control unit, substitute a known-good control unit, then recheck. If the system works properly, the original control unit is faulty; replace it. If there is still a malfunction, a substitute the known good control unit for another control unit, then recheck. If the system works properly, that control unit is faulty; replace it.