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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 1 circuit.
  4. Check terminals and connectors for damage, bend and loose connection.
Is the inspection result normal?
.
Repair the terminal and connector.
 
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
Check the continuity between the BCM harness connector and the IPDM E/R harness connector
BCM harness connectorIPDM E/R harness connectorContinuity
Connector No.Terminal No.Connector No.Terminal No.
M1826E12024Existed
2722Existed
Is the inspection result normal?
.
Check the harness and repair the root cause.
 
3.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the BCM terminals.
BCMContinuity
Connector No.Terminal No.
M182627Not 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.
BCMGroundContinuity
Connector No.Terminal No.
M1826Not existed
27Not existed
Is the inspection result normal?
.
Check the harness and repair or replace the root cause.
 
5.CHECK BCM AND IPDM E/R TERMINATION CIRCUIT
  1. Remove the BCM and the IPDM E/R.
  2. Check the resistance between the BCM terminals.
    BCMResistance (Ω)
    Terminal No.
    2627Approx. 108 – 132
  3. Check the resistance between the IPDM E/R terminals.
    IPDM E/RResistance (Ω)
    Terminal No.
    2422Approx. 108 – 132
Is the measurement value within the specification?
.
Replace the BCM and/or the IPDM E/R.
 
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 1 circuit.
    noteBCM and IPDM E/R have a termination circuit. 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.