STEP 1. Check the wiring harness between ETACS-ECU connector C-411 and body ground for a short to power supply. Measure the voltage at ETACS-ECU connector C-411.
| caution | A digital multimeter should be used. For details refer to  . |
| caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect ETACS-ECU connector C-411, and measure the voltage at the wiring harness side of ETACS-ECU connector C-411.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between ETACS-ECU connector C-411 terminal 6 and body ground.OK: 4.7 volts or less
(4) Measure the voltage between ETACS-ECU connector C-411 terminal 7 and body ground.OK: 4.7 volts or less
Do all the voltages measure 4.7 volts or less?
Go to Step 2.
Go to Step 8.
STEP 2. Check the wiring harness between joint connector (CAN1) C-05 and combination meter connector C-203 for a short to ground. Measure the resistance at joint connector (CAN1) C-05.
(1) Disconnect joint connector (CAN1) C-05, and measure the resistance at the wiring harness side of joint connector (CAN1) C-05.
(2) Measure the resistance between joint connector (CAN1) C-05 terminal 7 and body ground.OK: 1 kΩ or more
(3) Measure the resistance between joint connector (CAN1) C-05 terminal 18 and body ground.OK: 1 kΩ or more
Do all the resistances measure 1 kΩ or more?
(vehicles with KOS) :
Go to Step 3. (vehicles without KOS) :
Go to Step 5.Go to Step 14.
STEP 3. Check the wiring harness between joint connector (CAN1) C-05 and KOS-ECU connector C-10 for a short to ground. Measure the resistance at joint connector (CAN1) C-05.
(1) Disconnect joint connector (CAN1) C-05, and measure the resistance at the wiring harness side of joint connector (CAN1) C-05.
(2) Measure the resistance between joint connector (CAN1) C-05 terminal 9 and body ground.OK: 1 kΩ or more
(3) Measure the resistance between joint connector (CAN1) C-05 terminal 20 and body ground.OK: 1 kΩ or more
Do all the resistances measure 1 kΩ or more?
Go to Step 4. Go to Step 15.
STEP 4. Check the wiring harness between joint connector (CAN1) C-05 and OSS-ECU connector C-14 for a short to ground. Measure the resistance at joint connector (CAN1) C-05.
(1) Disconnect joint connector (CAN1) C-05, and measure the resistance at the wiring harness side of joint connector (CAN1) C-05.
(2) Measure the resistance between joint connector (CAN1) C-05 terminal 5 and body ground.OK: 1 kΩ or more
(3) Measure the resistance between joint connector (CAN1) C-05 terminal 16 and body ground.OK: 1 kΩ or more
Do all the resistances measure 1 kΩ or more?
Go to Step 6. Go to Step 16.
STEP 5. Check the wiring harness between joint connector (CAN1) C-05 and WCM connector C-09 for a short to ground. Measure the resistance at joint connector (CAN1) C-05.
(1) Disconnect joint connector (CAN1) C-05, and measure the resistance at the wiring harness side of joint connector (CAN1) C-05.
(2) Measure the resistance between joint connector (CAN1) C-05 terminal 9 and body ground.OK: 1 kΩ or more
(3) Measure the resistance between joint connector (CAN1) C-05 terminal 20 and body ground.OK: 1 kΩ or more
Do all the resistances measure 1 kΩ or more?
Go to Step 6. Go to Step 17.
STEP 6. Check the wiring harness between joint connector (CAN1) C-05 and A/C control panel connector C-216 for a short to ground. Measure the resistance at joint connector (CAN1) C-05.
(1) Disconnect joint connector (CAN1) C-05, and measure the resistance at the wiring harness side of joint connector (CAN1) C-05.
(2) Measure the resistance between joint connector (CAN1) C-05 terminal 6 and body ground.OK: 1 kΩ or more
(3) Measure the resistance between joint connector (CAN1) C-05 terminal 17 and body ground.OK: 1 kΩ or more
Do all the resistances measure 1 kΩ or more?
Go to Step 7. Go to Step 18.
STEP 7. Check the wiring harness between joint connector (CAN1) C-05 and ETACS-ECU connector C-411 for a short to ground. Measure the resistance at joint connector (CAN1) C-05.
(1) Disconnect joint connector (CAN1) C-05 and ETACS-ECU connector C-411, and measure the resistance at the wiring harness side of joint connector (CAN1) C-05.
(2) Measure the resistance between joint connector (CAN1) C-05 terminal 11 and body ground.OK: 1 kΩ or more
(3) Measure the resistance between joint connector (CAN1) C-05 terminal 22 and body ground.OK: 1 kΩ or more
Do all the resistances measure 1 kΩ or more?
Go to Step 19. Repair the wiring harness between joint connector (CAN1) C-05 and ETACS-ECU connector C-411.
STEP 8. Check the wiring harness between joint connector (CAN1) C-05 and combination meter connector C-203 for a short to power supply. Measure the voltage at joint connector (CAN1) C-05.
| caution | A digital multimeter should be used. For details refer to . |
| caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1) C-05, and measure the voltage at the wiring harness side of joint connector (CAN1) C-05.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN1) C-05 terminal 7 and body ground.OK: 4.7 volts or less
(4) Measure the voltage between joint connector (CAN1) C-05 terminal 18 and body ground.OK: 4.7 volts or less
Do all the voltages measure 4.7 volts or less?
(vehicles with KOS) :
Go to Step 9. (vehicles without KOS) :
Go to Step 11.Go to Step 14.
STEP 9. Check the wiring harness between joint connector (CAN1) C-05 and KOS-ECU connector C-10 for a short to power supply. Measure the voltage at joint connector (CAN1) C-05.
| caution | A digital multimeter should be used. For details refer to . |
| caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1) C-05, and measure the voltage at the wiring harness side of joint connector (CAN1) C-05.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN1) C-05 terminal 9 and body ground.OK: 4.7 volts or less
(4) Measure the voltage between joint connector (CAN1) C-05 terminal 20 and body ground.OK: 4.7 volts or less
Do all the voltages measure 4.7 volts or less?
Go to Step 10. Go to Step 15.
STEP 10. Check the wiring harness between joint connector (CAN1) C-05 and OSS-ECU connector C-14 for a short to power supply. Measure the voltage at joint connector (CAN1) C-05.
| caution | A digital multimeter should be used. For details refer to . |
| caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1) C-05, and measure the voltage at the wiring harness side of joint connector (CAN1) C-05.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN1) C-05 terminal 5 and body ground.OK: 4.7 volts or less
(4) Measure the voltage between joint connector (CAN1) C-05 terminal 16 and body ground.OK: 4.7 volts or less
Do all the voltages measure 4.7 volts or less?
Go to Step 12. Go to Step 16.
STEP 11. Check the wiring harness between joint connector (CAN1) C-05 and WCM connector C-09 for a short to power supply. Measure the voltage at joint connector (CAN1) C-05.
| caution | A digital multimeter should be used. For details refer to . |
| caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1) C-05, and measure the voltage at the wiring harness side of joint connector (CAN1) C-05.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN1) C-05 terminal 9 and body ground.OK: 4.7 volts or less
(4) Measure the voltage between joint connector (CAN1) C-05 terminal 20 and body ground.OK: 4.7 volts or less
Do all the voltages measure 4.7 volts or less?
Go to Step 12. Go to Step 17.
STEP 12. Check the wiring harness between joint connector (CAN1) C-05 and A/C control panel connector C-216 for a short to power supply. Measure the voltage at joint connector (CAN1) C-05.
| caution | A digital multimeter should be used. For details refer to . |
| caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1) C-05, and measure the voltage at the wiring harness side of joint connector (CAN1) C-05.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN1) C-05 terminal 6 and body ground.OK: 4.7 volts or less
(4) Measure the voltage between joint connector (CAN1) C-05 terminal 17 and body ground.OK: 4.7 volts or less
Do all the voltages measure 4.7 volts or less?
Go to Step 13. Go to Step 18.
STEP 13. Check the wiring harness between joint connector (CAN1) C-05 and ETACS-ECU connector C-411 for a short to power supply. Measure the voltage at joint connector (CAN1) C-05.
| caution | A digital multimeter should be used. For details refer to . |
| caution | The test wiring harness should be used. For details refer to . |
(1) Disconnect joint connector (CAN1) C-05 and ETACS-ECU connector C-411, and measure the voltage at the wiring harness side of joint connector (CAN1) C-05.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between joint connector (CAN1) C-05 terminal 11 and body ground.OK: 1.0 volt or less
(4) Measure the voltage between joint connector (CAN1) C-05 terminal 22 and body ground.OK: 1.0 volt or less
Do all the voltages measure 1.0 volt or less?
Go to Step 19. Repair the wiring harness between joint connector (CAN1) C-05 and ETACS-ECU connector C-411.
STEP 14. Using scan tool MB991958, diagnose the CAN bus line. (checking the combination meter for internal failure)
| caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
(1) Disconnect combination meter connector C-203 and read all diagnosis with scan tool MB991958.
(2) Confirm that all diagnosis reading results are as shown in the table.
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) C-05 and combination meter connector C-203. Check combination meter connector C-203, and repair if necessary. If the combination meter connector is in good condition, replace the combination meter.
STEP 15. Using scan tool MB991958, diagnose the CAN bus line. (checking the KOS-ECU for internal failure)
| caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
(1) Disconnect KOS-ECU connector C-10 and read all diagnosis with scan tool MB991958.
(2) Confirm that all diagnosis reading results are as shown in the table.
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) C-05 and KOS-ECU connector C-10. Check KOS-ECU connector C-10, and repair if necessary. If the KOS-ECU connector is in good condition, replace the KOS-ECU.
STEP 16. Using scan tool MB991958, diagnose the CAN bus line. (checking the OSS-ECU for internal failure)
| caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
(1) Disconnect OSS-ECU connector C-14 and read all diagnosis with scan tool MB991958.
(2) Confirm that all diagnosis reading results are as shown in the table.
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) C-05 and OSS-ECU connector C-14. Check OSS-ECU connector C-14, and repair if necessary. If the OSS-ECU connector is in good condition, replace the OSS-ECU.
STEP 17. Using scan tool MB991958, diagnose the CAN bus line. (checking the WCM for internal failure)
| caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
(1) Disconnect WCM connector C-09 and read all diagnosis with scan tool MB991958.
(2) Confirm that all diagnosis reading results are as shown in the table.
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) C-05 and WCM connector C-09. Check WCM connector C-09, and repair if necessary. If the WCM connector is in good condition, replace the WCM.
STEP 18. Using scan tool MB991958, diagnose the CAN bus line. (checking the A/C control panel for internal failure)
| caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
(1) Disconnect A/C control panel connector C-216 and read all diagnosis with scan tool MB991958.
(2) Confirm that all diagnosis reading results are as shown in the table.
Are all diagnosis reading results as shown in the table?
Repair the wiring harness between joint connector (CAN1) C-05 and A/C control panel connector C-216. Check A/C control panel connector C-216, and repair if necessary. If the A/C control panel connector is in good condition, replace the A/C control panel.
STEP 19. Using scan tool MB991958, diagnose the CAN bus line. (trouble symptom check)
| caution | Strictly observe the specified wiring harness repair procedure. For details refer to . |
(1) Read all diagnosis with scan tool MB991958.
(2) Confirm that all diagnosis reading results are as shown in the table.
Are all diagnosis reading results as shown in the table?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ). Check the ETACS-ECU connector C-411, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU.
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