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Diagnostic Item 21

DIAGNOSTIC ITEM 21: Diagnose the lines between CAN main bus line and the multi-center display (middle-grade type)

CAUTION: When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.









TROUBLE JUDGMENT
If the MUT-III cannot received signals from the multi-center display unit (middle-grade type), CAN bus line connector(s) are broken or an open circuit has occurred.

COMMENTS ON TROUBLE SYMPTOM
The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or multi-center display unit (middle-grade type) may be defective.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector
- The multi-center display unit (middle-grade type) may be defective

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set










STEP 1. Check joint connector (3) C-02 and multi-center display unit (middle-grade type) connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details Service Precautions/Vehicle Damage Warnings.

Check the joint connector at the wiring harness side for loose, corroded or damaged terminals, or terminals pushed back in the connector, and also check the short pin behind the connector for corrosion, deformation and delamination.

Q: Are joint connector (3) C-02 and multi-center display unit (middle-grade type) connector C-05 in good condition?

YES: Go to Step 2.

NO: Repair the damaged parts. Replace the joint connector as necessary.

STEP 2. Check the CAN bus lines between joint connector (3) and the multi-center display unit (middle-grade type). Measure the resistance between joint connector (3) C-02 and multi-center display unit (middle-grade type) connector C-05.

CAUTION: A digital multimeter should be used. For details Service Precautions/Vehicle Damage Warnings.

CAUTION: The test wiring harness should be used. For details Service Precautions/Vehicle Damage Warnings.







1. Disconnect joint connector (3) C-02 and multi-center display unit (middle-grade type) connector C-05, and measure the resistance at the wiring harness sides of joint connector (3) C-02 and multi-center display unit (middle-grade type) connector C-05.
2. Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION: Disconnect the negative battery terminal. For details Service Precautions/Vehicle Damage Warnings.

3. Disconnect the negative battery terminal.




4. Measure the resistance between joint connector (3) terminal 8 and multi-center display unit (middle-grade type) connector terminal 13.

OK: 2 ohms or less




5. Measure the resistance between joint connector (3) terminal 19 and multi-center display unit (middle-grade type) connector terminal 12.

OK: 2 ohms or less

CAUTION: Strictly observe the specified wiring harness repair procedure. For details Service Precautions/Vehicle Damage Warnings.

Q: Do all the resistances measure 2 ohms or less?

YES: If all the resistances measure 2 ohms or less, power supply to the multi-center display (middle-grade type) may be suspected. Diagnose the multi-center display (middle-grade type). Refer to "Inspection Procedure 1: Communication with Scan Tool is Not Possible. (Middle Grade Type)".

NO: If either of the resistances measures more than 2 ohms or all the resistances measure more than 2 ohms, repair the wiring harness between joint connector (3) and the multi-center display unit (middle-grade type) connector.
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