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Diagnosis Item 42: Diagnose the lines between the joint connectors (CAN2 and CAN1).
 
 
cautionWhen servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.
 
 
FUNCTION
If the scan tool (M.U.T.-IIISE) cannot receive signals from the ECUs below, CAN bus line connector(s) are broken or an open circuit has occurred.
  • BMU
  • Electrical parking driver unit
  • REMCU
  • On board charger/DC-DC converter
  • Electric heater-ECU
 
 
TROUBLE JUDGMENT CONDITIONS
The CAN bus line wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector.
 
 
PROBABLE CAUSE
Damaged harness wires and connectors
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Connector check: joint connector (CAN2) and joint connector (CAN1).
cautionThe strand end of the twist wire should be within 10 cm (4 inches) from the connector. For details refer to .
When checking the joint connector, ensure that its wiring harness side and its short pins are not damaged.
Is the check result normal?
Go to Step 2.
Repair the defective connector. Replace the joint connector as necessary.
 
STEP 2. Resistance measurement at joint connector (CAN2) and joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect the joint connector (CAN2) and the joint connector (CAN1), and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Continuity between joint connector (CAN2) terminal No.10 and joint connector (CAN1) terminal No.9
OK: Continuity (2 ohms or less)
(5) Continuity between joint connector (CAN2) terminal No.21 and joint connector (CAN1) terminal No.18
OK: Continuity (2 ohms or less)
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<All the resistances measure 2 ohms or less> Follow diagnosis item 44, 45, 46, 47, 48, 49 and 50. Refer to .
: <Either or all of the resistances measure more than 2 ohms> Repair the wiring harness between joint connector (CAN2) and joint connector (CAN1).