W/Harness Inspection

Body Control Module
B1640 LIN RECEPTION ERROR FOR M/F SW - Inspection/Repair:_: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 then go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "M/F SW Signal Circuit Inspection" procedure.

Signal Circuit Inspection

1. Check LIN communication circuit
1. Ignition "ON" and Engine "OFF"
2. Connect scantool and select VEHICLE SCOPEMETER function.
3. Measure waveform between "LIN communication" of M/F SW connector and chassis ground.
A. Specification :If LIN communication waveform is displayed, it is OK.




4. Is LIN communication waveform displayed within specification?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
NO
1) Check the the LIN communication harness of the M/F SW for an open
Repair as necessary and then go to "Verification of Vehicle Repair" procedure.