Inspection Procedure 8: Power supply or communication circuit to the CAN box unit is defective.
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Before replacing the CAN box unit, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
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- Malfunction of CAN box unit
- Malfunction of multivision display
- Damaged harness wires and connectors
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STEP 1. Check the multivision display
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Check if the multivision display power is turned ON.
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Q.
Is the check result normal?
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Go to Step 2.
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Perform Inspection Procedure 1 "No navigation screen is displayed."(Refer to .)
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STEP 2. Voltage measurement at CAN box unit connector (+B, ACC terminal).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Check the voltage between the DAB tuner connector (+B, ACC terminal) and body earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check of short to power supply, short to earth, and open circuit in +B, ACC line between CAN box unit connector and joint connector
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).
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Repair the connector(s) or wiring harness.
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STEP 4. Resistance measurement at CAN box unit connector (GND terminal).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Check the continuity between the CAN box unit connector (GND terminal) and body earth. OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check of open circuit in GND line between CAN box unit connector and body earth
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).
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Repair the connector(s) or wiring harness.
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STEP 6. Check of short or open circuit in TX-C, RX-C, CK-C, SH-C line between CAN box unit connector and multivision display connector
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Q.
Is the check result normal?
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Replace the CAN box unit.
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Repair the connector(s) or wiring harness.
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