3.
Has a problem been found?
 | ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure |
 | ▶ Go to "Power Circuit Inspection" procedure. |
Many malfunctions in the electrical system are caused by poor harness 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 go to "Verification of Vehicle Repair" procedure |
| ▶ Go to "Power Circuit Inspection" procedure. |
IG "OFF" and disconnect ECM connector.
IG "ON"
Brake 'OFF' : Measure the voltage between brake lamp signal terminal of ECM harness connector and chassis ground.(Measurement "A")
Brake 'ON' : Measure the voltage between brake lamp signal terminal of ECM harness connector and chassis ground.(Measurement "B")
Item | Brake 'OFF' | Brake 'ON' |
Brake Lamp side | 0V | Battery voltage |
Is the measured voltage within specification ?
| ▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair as necessary and go to "Verification of Vehicle Repair" procedure. |
| ▶ Go to "Check open in harness" as follows. |
IG "OFF" and disconnect stop lamp switch and ECM connector.
Measure the resistance between brake lamp signal terminal of ECM harness connector and brake lamp signal terminal of Stop lamp switch harness connector.
Specification : Below 1Ω
Is the measured resistance within specification ?
| ▶ Go to "Check Battery voltage" procedure. |
| ▶ Repair open in circuit and go to "Verification of Vehicle Repair" procedure. |
IG "OFF" and disconnect stop lamp switch connector.
Measure the voltage between power supply terminals of stop lamp switch harness connector and chassis ground.
IG "ON"
Measure the voltage between power supply terminals of stop lamp switch harness connector and chassis ground.
Item | IG "OFF" | IG "ON" |
Power supply to brake switch side | Battery voltage | Battery voltage |
Power supply to brake lamp side | 0V | Battery voltage |
Is the measured voltage within specification ?
| ▶ Substitute with a known - good stop lamp switch and check for proper operation. If the problem is corrected, replace stop lamp switch and go to "Verification of Vehicle Repair" procedure. |
| ▶ Check the fuse between battery and stop lamp switch. ▶ Repair open or short in power circuit of stop lamp switch and go to "Verification of Vehicle Repair" procedure. |
