Diagnosis Item 7: Diagnose shorts in the earth to GW-CAN-C. <Vehicles with Blind Spot Warning [BSW] (with Lane Change Assist) system>
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When servicing a CAN bus line, earth 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.
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TROUBLE JUDGEMENT CONDITIONS
The M.U.T.-III judges the trouble when it is impossible to receive the periodically sent data and the voltage of CAN_H or CAN_L line is less than 1.0 V.
TROUBLESHOOTING HINTS
- Malfunction of the wiring harness
- Malfunction of the gateway-ECU
- Malfunction of the BSW-ECU (master)
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STEP 1. Check the GW-CAN-C. Resistance measurement at gateway-ECU connector.
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A digital multimeter should be used.
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The test wiring harness should be used.
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(1)Disconnect the gateway-ECU connector and the BSW-ECU (master) connector, and measure at the wiring harness side.
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(2)
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When measuring the resistance, disconnect the negative auxiliary battery terminal.
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Ensure that the negative battery terminal is disconnected.
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(3)Resistance between the gateway-ECU connector terminal No.6 (CAN_H) and body earth.
OK: 1 kΩ or more
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(4)Resistance between the gateway-ECU connector terminal No.5 (CAN_L) and body earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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 <1 kΩ or more> Go to Step 2.
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 <Less than 1 kΩ > Repair intermediate connectors C-25 and G-36, or the wiring harness between the gateway-ECU connector and the BSW-ECU (master) connector.
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STEP 2. Check the GW-CAN-C. Resistance measurement at BSW-ECU (master) connector.
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| caution |
A digital multimeter should be used.
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| caution |
The test wiring harness should be used.
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(1)Disconnect the BSW-ECU (master) connector, and measure at the wiring harness side.
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(2)
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When measuring the resistance, disconnect the negative auxiliary battery terminal.
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Ensure that the negative battery terminal is disconnected.
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(3)Resistance between the BSW-ECU (master) connector terminal No.4 (CAN_H) and body earth.
OK: 1 kΩ or more
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(4)Resistance between the BSW-ECU (master) connector terminal No.9 (CAN_L) and body earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more> Go to Step 3.
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<Less than 1 kΩ > Check the gateway-ECU connector, and repair if necessary. If the gateway-ECU connector is in good condition, replace the gateway-ECU.
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STEP 3. Check the GW-CAN-C. Resistance measurement at gateway-ECU connector.
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| caution |
A digital multimeter should be used.
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| caution |
The test wiring harness should be used.
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(1)Disconnect the gateway-ECU connector, and measure at the wiring harness side.
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(2)
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When measuring the resistance, disconnect the negative auxiliary battery terminal.
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Ensure that the negative battery terminal is disconnected.
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(3)Resistance between the gateway-ECU connector terminal No.6 (CAN_H) and body earth.
OK: 1 kΩ or more
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(4)Resistance between the gateway-ECU connector terminal No.5 (CAN_L) and body earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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<1 kΩ or more> 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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<Less than 1 kΩ > Check the BSW-ECU (master) connector, and repair if necessary. If the BSW-ECU (master) connector is in good condition, replace the BSW-ECU (master).
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