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Diagnosis Procedure
1.CONNECTOR INSPECTION
  1. Turn the ignition switch OFF.
  2. Disconnect the battery cable from the negative terminal.
  3. Disconnect all the unit connectors on vehicle CAN communication 2 circuit.
  4. Check the terminals and connectors for damage, bend and loose connection (unit side and connector side).
Is the inspection result normal?
.
Repair the terminal and connector.
 
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
Check the continuity between the BCM harness connector terminals.
BCM harness connectorContinuity
Connector No.Terminal No.Connector No.Terminal No.
B2687E29118Existed
86117Existed
Is the inspection result normal?
.
Check the harness and repair or replace the root cause.
 
3.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the BCM harness connector terminals.
BCM harness connectorContinuity
Connector No.Terminal No.
B268786Not existed
Is the inspection result normal?
.
Check the harness and repair or replace the root cause.
 
4.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the BCM and the ground.
BCM harness connectorGroundContinuity
Connector No.Terminal No.
B2687Not existed
86Not existed
Is the inspection result normal?
.
Check the harness and repair or replace the root cause.
 
5.CHECK BCM TERMINATION CIRCUIT
  1. Remove the BCM.
  2. Check the resistance between the BCM terminals.
    BCMResistance (Ω)
    Terminal No.
    8786Approx. 108 – 132
    118117Approx. 108 – 132
Is the measurement value within the specification?
.
Replace the BCM.
 
6.CHECK SYMPTOM
Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with customer)” are reproduced.
Inspection result
: .
: Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.
 
7.CHECK UNIT REPRODUCTION
Perform the reproduction test as per the following procedure for each unit.
  1. Turn the ignition switch OFF.
  2. Disconnect the battery cable from the negative terminal.
  3. Disconnect one of the unit connectors of vehicle CAN communication circuit 2.
    note
    • BCM has two termination circuits. Check other units first.
  4. Connect the battery cable to the negative terminal. Check if the symptoms described in the “Symptom (Results from interview with customer)” are reproduced.
    noteAlthough unit-related error symptoms occur, do not confuse them with other symptoms.
Inspection result
: Connect the connector. Check other units as per the above procedure.
: Replace the unit whose connector was disconnected.