Mode 1

- 1 second after you go into self-diagnosis function mode 1, the function starts to indicate the diagnosis trouble code (DTC), and repeats the DTC every 3 seconds.
- From mode 1, disconnect the SCS service connector for 5 to 10 seconds, then reconnect the SCS service connector, and the function goes from mode 1 to mode 2.

Diagnostic Trouble Code (DTC) Table:

NOTE: If no DTCs are indicated, but you know the system is abnormal, check these items:
- If the light does not come on and the buzzer does not beep, check the continuity between the BLK wire of the multiplex control inspection connector and body ground.
- If either the light or the beep indicates the DTC(s), check the continuity between the PNK/BLK wire of the multiplex control inspection connector and multiplex control units (driver's and passenger's).

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 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.