Terminal and Connector Inspection
1.

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.

2.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

3.

Has a problem been found?

YES

Repair as necessary and go to "Verification of Vehicle Repair" procedure.

NO

Go to "Power Circuit Inspection" procedure.

Power Supply Circuit Inspection
1.

Check for open or short in Power harness

(1)

Ignition "OFF" & Engine "OFF".

(2)

Disconnect Brake switch connector.

(3)

Ignition "ON" & Engine "OFF".

(4)

Measure voltage between terminal 2 of the Brake switch harness connector and chassis ground.

(5)

Measure voltage between terminal 3 of the Brake switch harness connector and chassis ground.

Specification : B+

(6)

Is the measured voltage within specifications ?

YES

▶ Go to "Ground Circuit Inspection" procedure.

NO

▶ Check for open or short in the power harness.

Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Signal Circuit Inspection
1.

Check for short to battery in Brake SW 1 and 2 signal harness.

(1)

Ignition "OFF" & Engine "OFF".

(2)

Disconnect Brake switch sensor connector.

(3)

Ignition "ON" & Engine "OFF"

(4)

Measure voltage between terminal 1 of Brake switch harness connector and chassis ground

(5)

Measure voltage between terminal 4 of Brake switch harness connector and chassis ground

Specification : Approx. below 1V

(6)

Is the measured voltage within specifications ?

YES

▶ Go to "Check for short to ground in harness" as below.

NO

▶ Check for short to battery in harness.

Repair as necessary and go to "Verification of Vehicle Repair" procedure

2.

Check for short to ground in harness.

(1)

Ignition "OFF" & Engine "OFF".

(2)

Disconnect Brake switch and ECM connector.

(3)

Measure resistance between terminal 4 of Brake switch harness connector and chassis ground.

(4)

Measure resistance between terminal 1 of Brake switch harness connector and chassis ground.

Specification : Infinite

(5)

Is the measured resistance within specifications ?

YES

▶ Go to "Check for open in harness" as below.

NO

▶ Check for short to ground in harness.

Repair as necessary and go to "Verification of Vehicle Repair" procedure.

3.

Check for open in harness

(1)

Ignition "OFF" & Engine "OFF".

(2)

Disconnect Brake switch and ECM connector.

(3)

Measure resistance between terminal 4 of Brake switch harness connector and terminal 54 of ECM harness connector.

(4)

Measure resistance between terminal 1 of Brake switch harness connector and terminal 59 of ECM harness connector.

Specification : Approx. below 1Ω

4.

Is the measured resistance within specifications ?

YES

▶ Go to "Component Inspection" procedure.

NO

▶ Check for open in harness.

Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Яндекс.Метрика