3.
Has a problem been found?
 | ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
 | ▶ Go to "Signal Circuit Inspection (brake pedal isn't depressed)" procedure. |
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.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
| ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
| ▶ Go to "Signal Circuit Inspection (brake pedal isn't depressed)" procedure. |
Signal circuit inspection (brake pedal isn't pressed)
Ignition "ON" & Engine "OFF".
Measure voltage between stop lamp switch (brake switch) terminal of the HECU harness connector and hassis ground.
Specification : Stop lamp switch - 0V
Brake switch B - B+
Is the measured waveform within specifications?
| ▶ Go to "Signal Circuit Inspection (brake pedal is depressed)" procedure. |
| ▶ Check for open or blown fuse referring to "Circuit Diagram". Repair open or short in power circuit between battery and HECU harness connector and then, go to "Verification of vehicle Repair" procedure. If there is no problem in circuit, Go to "Component Inspection" procedure. |
Signal Circuit Inspection (brake pedal is pressed)
Ignition "ON" & Engine "OFF".
Press the brake pedal.
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 - 0 V
Is the measured waveform within specifications?
| ▶ Fault is intermittent caused by poor connection in brake light switch harness and/or HECU's connector. Go to "Verification of Vehicle Repair" procedure. |
| ▶ Check for open or blown fuse referring to "Circuit Diagram". Repair open or short in power circuit between battery and HECU harness connector and then go to "Verification of vehicle Repair" procedure. If there is no problem in circuit, Go to "Component Inspection" procedure. |
