W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition. Faults can also be caused by interference from other electrical systems and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
3. Has a problem been found?






Signal circuit inspection

Signal circuit inspection (brake pedal isn't pressed)
Open or Short Check
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between stop lamp switch (brake switch) terminal of the HECU harness connector and hisses ground.

Specification : Stop lamp switch-0V
Brake switch B-B+





3. Is the measured waveform within specifications?





Signal Circuit Inspection (brake pedal is pressed)
Open or Short Check
1. Ignition "ON" & Engine "OFF".
2. Press the brake pedal.
3. Measure voltage between stop lamp switch (brake switch) terminal of the HECU harness connector and chassis ground.

Specification : Stop lamp switch-B+
Brake switch B-0V





4. Is the measured waveform within specifications?