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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 control unit connectors on vehicle CAN communication 3 circuit.
  4. Check the 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 8CH CAN gateway harness connector and BCM harness connector.
8CH CAN gateway harness connectorBCM harness connectorContinuity
Connector No.Terminal No.Connector No.Terminal No.
M2933M1945Existed
3446Existed
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 8CH CAN gateway harness connector terminals.
8CH CAN gateway harness connectorContinuity
Connector No.Terminal No.
M293334Not 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 8CH CAN gateway and the ground.
8CH CAN gateway harness connectorGroundContinuity
Connector No.Terminal No.
M2933Not existed
34Not existed
Is the inspection result normal?
.
Check the harness and repair or replace (if shield line is short) the root cause.
 
5.CHECK 8CH CAN gateway AND BCM TERMINATION CIRCUIT
  1. Remove the 8CH CAN gateway and the BCM.
  2. Check the resistance between the 8CH CAN gateway terminals.
    8CH CAN gatewayResistance (Ω)
    Terminal No.
    3334Approx. 108 – 132
  3. Check the resistance between the BCM terminals.
    BCMResistance (Ω)
    Terminal No.
    4546Approx. 108 – 132
Is the measurement value within the specification?
.
(BCM)Replace the BCM.
(8CH CAN gateway).
 
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 3 circuit.
    note8CH CAN gateway and BCM have a 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.
 
8.CHECK WARNING LIGHT
  1. Turn the ignition switch ON.
  2. Check the following warning light.
    • ASC warning light
    • Brake warning light
    • Power steering warning light
    • Engine oil pressure warning light
Is any of the inspection result normal?
INSPECTION END
.
 
9.CHECK NAVIGATION SYSTEM OPERATION
Check navigation system operation.
noteNavigation system is not applied: Replace the 8CH CAN gateway.
Is the inspection result normal?
INSPECTION END
Replace the 8CH CAN gateway.