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 pressed)" procedure. |
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. 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 pressed)" procedure. |
IG "ON".
Measure voltage between brake light switch (brake switch) terminal of the HECU harness connector and hassis ground.
Specification : Brake light switch - 0V
Brake switch - B+
Is the measured value within specifications?
| ▶ Go to "Signal Circuit Inspection (brake pedal is pressed)" 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. |
IG "ON".
Press the brake pedal.
Measure voltage between brake light switch (brake switch) terminal of the HECU harness connector and chassis ground.
Specification : Brake light switch - B+
Brake switch - 0V
Is the measured value 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. |
