W/Harness Inspection

Terminal and Connector Inspection

1. 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.
2. Check the following conditions:
(1) Check for damaged harness and terminals: contact resistance, oxidation, bent or broken terminals.
(2) Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks and poor terminal to wire connection.

NOTE: Using a suitable male pin to ensure that contact in sockets is good. The pin should remain in position when pulled gently.

3. Has a problem been found ?
YES
1) Repair as necessary and go to "Verification Vehicle Repair" procedure.
NO
1) Go to "Signal Circuit Inspection" procedure.

Signal Circuit Inspection

1. Check BCM's sending signal
(1) Engine "ON" and wiper switch "AUTO"
(2) Connect scantool and select VEHICLE SCOPE METER function.
(3) Measure waveform between rain sensor harness connector.
A. Specification :If BCM sends a pulse width modulated waveform, it is OK.




(4) Is measured resistance within specifications ?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "Check signal circuit" as below.
2. Check signal circuit
(1) Ignition "ON" and Engine "OFF"
(2) Disconnect rain sensor and BCM connector.
(3) Measure resistance between of the RAIN SENSOR harness connector and BCM harness connector.
A. Specification : Approx. 1 Ohm below.




(4) Is the measured resistance within specifications ?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Substitute with a known-good BCM and check proper condition.
If the problem is corrected, replace BCM and then go to "Verification of Vehicle Repair" procedure.