Diagnosis Item 2: Diagnose shorts in the earth to CAN bus line


caution 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.




























FUNCTION


When diagnosing the CAN bus lines, the M.U.T.-III measures the voltage of CAN_H and CAN_L line and detects the short to power supply or earth.

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



DIAGNOSIS PROCEDURE

STEP 1. Check the CAN bus lines. Resistance measurement at B-20 diagnosis connector.
caution A digital multimeter should be used. For details refer to .
caution The test wiring harness should be used. For details refer to .
note This inspection allows you to check that there is a short to earth in either CAN_H line or CAN_L line. Thus, in the following steps, check the CAN bus line that is defective.
(1)Disconnect EV-ECU connector C-108 and ETACS-ECU connector B-317, and measure the resistance at harness side of diagnosis connector B-20.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between B-20 diagnosis connector terminal No.6 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between B-20 diagnosis connector terminal No.14 (CAN_L) and body earth
OK: 1 kΩ or more

Q. Is the check result normal?

<Both of the measurement results show 1 kΩ or more> Go to Step 2.

<Either of CAN_H line or CAN_L line the measurement results show less than 1 kΩ > Go to Step 6.

STEP 2. M.U.T.-III CAN bus diagnostics (EV-ECU connector disconnected)
(1)Disconnect EV-ECU connector C-108 and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> Go to Step 4 .

<M.U.T.-III indications do not correspond to the illustration> Check the EV-ECU connector, and repair if necessary. If the EV-ECU connector is in good condition, go to Step 3.

STEP 3. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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 EV-ECU connector, and repair if necessary. If the EV-ECU connector is in good condition, replace the EV-ECU and register the ID codes (Refer to GROUP 54A, Immobilizer system - On-vehicles service ).

STEP 4. M.U.T.-III CAN bus diagnostics (ETACS-ECU connector disconnected)
(1)Disconnect ETACS-ECU connector B-317, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> The trouble can be an intermittent malfunction (GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

<M.U.T.-III indications do not correspond to the illustration> Check the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector is in good condition, go to Step 5.

STEP 5. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU and register the ID codes (Refer to GROUP 54A, Immobilizer system - On-vehicles service ).

STEP 6. Check the CAN line. Resistance measurement at B-24 joint connector (CAN1).
caution A digital multimeter should be used. For details refer to .
caution The test wiring harness should be used. For details refer to .
(1)Turn the electric motor switch to the LOCK (OFF) position.
(2)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(3)Resistance between B-24 joint connector (CAN1) terminal No.11 (CAN_H) and body earth
OK: 1 kΩ or more

(4)Resistance between B-24 joint connector (CAN1) terminal No.22 (CAN_L) and body earth
OK: 1 kΩ or more

Q. Is the check result normal?

<1 kΩ or more> Go to Step 20.

<Less than 1 kΩ > Go to Step 7.

STEP 7. Check the CAN line between joint connector (CAN2) and the EV-ECU. Resistance measurement at C-103 joint connector (CAN2).
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 (CAN2), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between C-103 joint connector (CAN2) terminal No.8 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between C-103 joint connector (CAN2) terminal No.19 (CAN_L) and body earth
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 8.

NO : <Less than 1 kΩ > Repair the wiring harness between joint connector (CAN2) and the EV-ECU connector.

STEP 8. Check the CAN line between joint connector (CAN2) and the inverter. Resistance measurement at C-103 joint connector (CAN2).
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 (CAN2), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between C-103 joint connector (CAN2) terminal No.6 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between C-103 joint connector (CAN2) terminal No.17 (CAN_L) and body earth
OK: 1 kΩ or more

Q. Is the check result normal?

<1 kΩ or more> Go to Step 11.

<Less than 1 kΩ > Go to Step 9.

STEP 9. M.U.T.-III CAN bus diagnostics (inverter connector disconnected)
(1)Disconnect inverter connector E-06, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> Prior to the wiring harness inspection, check C-102 intermediate connector, and repair if necessary. Repair the wiring harness between joint connector (CAN2) and the inverter connector.

<M.U.T.-III indications do not correspond to the illustration> Check the inverter connector, and repair if necessary. If the inverter connector is in good condition, go to Step 10.

STEP 10. M.U.T.-III CAN bus diagnostics (retest the system)
danger Carry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to .
danger Wear the specified protection equipment during the check.
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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 inverter connector, and repair if necessary. If the MCU connector is in good condition, replace the MCU and register the ID codes (Refer to GROUP 54A, Immobilizer system - On-vehicles service ).

STEP 11. Check the CAN line between joint connector (CAN2) and the BMU. Resistance measurement at C-103 joint connector (CAN2)
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 (CAN2), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between C-103 joint connector (CAN2) terminal No.9 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between C-103 joint connector (CAN2) terminal No.20 (CAN_L) and body earth
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 14.

<Less than 1 kΩ > Go to Step 12.

STEP 12. M.U.T.-III CAN bus diagnostics (BMU connector disconnected)
(1)Disconnect BMU connector C-107, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> Repair the wiring harness between joint connector (CAN2) and the BMU connector.

<M.U.T.-III indications do not correspond to the illustration> Check the BMU connector, and repair if necessary. If the BMU connector is in good condition, go to Step 13.

STEP 13. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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 BMU connector, and repair if necessary. If the BMU connector is in good condition, replace the BMU.

STEP 14. Check the CAN line between joint connector (CAN2) and the on board charger/DC-DC converter. Resistance measurement at C-103 joint connector (CAN2).
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 (CAN2), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between C-103 joint connector (CAN2) terminal No.7 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between C-103 joint connector (CAN2) terminal No.18 (CAN_L) and body earth
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 17.

<Less than 1 kΩ Go to Step 15.

STEP 15. M.U.T.-III CAN bus diagnostics (on board charger/DC-DC converter connector disconnected)
(1)Disconnect on board charger/DC-DC converter connector E-03, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> Prior to the wiring harness inspection, check C-102 intermediate connector, and repair if necessary. Repair the wiring harness between joint connector (CAN2) and the on board charger/DC-DC converter connector.

<M.U.T.-III indications do not correspond to the illustration> Check the on board charger/DC-DC converter connector, and repair if necessary. If the on board charger/DC-DC converter connector is in good condition, go to Step 16.

STEP 16. M.U.T.-III CAN bus diagnostics (retest the system)
danger Carry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to .
danger Wear the specified protection equipment during the check.
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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 on board charger/DC-DC converter connector, and repair if necessary. If the on board charger/DC-DC converter connector is in good condition, replace the on board charger/DC-DC converter.

STEP 17. Check the CAN line between joint connector (CAN2) and the A/C control unit. Resistance measurement at C-103 joint connector (CAN2).
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 (CAN2), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between C-103 joint connector (CAN2) terminal No.10 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between C-103 joint connector (CAN2) terminal No.21 (CAN_L) and body earth
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Repair joint connector E-03, or the wiring harness between joint connector (CAN2) and joint connector C-103.

<Less than 1 kΩ > Go to Step 18.

STEP 18. M.U.T.-III CAN bus diagnostics (A/C control unit connector disconnected)
(1)Disconnect A/C control unit connector C-101, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> Repair the wiring harness between joint connector (CAN2) and the A/C control unit connector.

<M.U.T.-III indications do not correspond to the illustration> Check the A/C control unit connector, and repair if necessary. If the A/C control unit connector is in good condition, go to Step 19.

STEP 19. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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 compressor/heater controller connector, and repair if necessary. If the A/C control unit connector is in good condition, replace the A/C control unit.

STEP 20. Check CAN line between joint connector (CAN1) and the ETACS-ECU. Resistance measurement at B-24 joint connector (CAN1).
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), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between B-24 joint connector (CAN1) terminal No.7 (CAN_H) and body earth <LHD>
OK: 1 kΩ or more

(5)Resistance between B-24 joint connector (CAN1) terminal No.18 (CAN_L) and body earth <LHD>
OK: 1 kΩ or more

(6)Resistance between B-24 joint connector (CAN1) terminal No.6 (CAN_H) and body earth <RHD>
OK: 1 kΩ or more

(7)Resistance between B-24 joint connector (CAN1) terminal No.17 (CAN_L) and body earth <RHD>
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 21.

<Less than 1 kΩ > Repair the wiring harness between joint connector (CAN1) and the ETACS-ECU connector.

STEP 21. Check the CAN line between joint connector (CAN1) and the combination meter. Resistance measurement at B-24 joint connector (CAN1).
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), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between B-24 joint connector (CAN1) terminal No.6 (CAN_H) and body earth <LHD>
OK: 1 kΩ or more

(5)Resistance between B-24 joint connector (CAN1) terminal No.17 (CAN_L) and body earth <LHD>
OK: 1 kΩ or more

(6)Resistance between B-24 joint connector (CAN1) terminal No.5 (CAN_H) and body earth <RHD>
OK: 1 kΩ or more

(7)Resistance between B-24 joint connector (CAN1) terminal No.16 (CAN_L) and body earth <RHD>
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 24.

NO : <Less than 1 kΩ > Go to Step22.

STEP 22. M.U.T.-III CAN bus diagnostics (combination meter connector disconnected)
(1)Disconnect combination meter connector B-101, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> Prior to the wiring harness inspection, check B-120 intermediate connector, and repair if necessary. Repair the wiring harness between joint connector (CAN1) and the combination meter connector.

<M.U.T.-III indications do not correspond to the illustration> Check the combination meter connector, and repair if necessary. If the combination meter connector is in good condition, go to Step 23

STEP 23. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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 combination meter connector, and repair if necessary. If the combination meter connector is in good condition, replace the combination meter.

STEP 24. Check the CAN line between joint connector (CAN1) and the ASC-ECU. Resistance measurement at B-24 joint connector (CAN1).
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), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between B-24 joint connector (CAN1) terminal No.9 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between B-24 joint connector (CAN1) terminal No.20 (CAN_L) and body earth
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 27.

NO : <Less than 1 kΩ > Go to Step 25.

STEP 25. M.U.T.-III CAN bus diagnostics (ASC-ECU connector disconnected)
(1)Disconnect ASC-ECU connector A-14, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> Prior to the wiring harness inspection, check B-01 intermediate connector, and repair if necessary. Repair the wiring harness between joint connector (CAN1) and the ASC-ECU connector.

<M.U.T.-III indications do not correspond to the illustration> Check the ASC-ECU connector, and repair if necessary. If the ASC-ECU connector is in good condition, go to Step 26.

STEP 26. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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 ASC-ECU connector, and repair if necessary. If the ASC-ECU connector is in good condition, replace the hydraulic unit assembly.

STEP 27. Check the CAN line between joint connector (CAN1) and the EPS-ECU. Resistance measurement at B-24 joint connector (CAN1).
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), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between B-24 joint connector (CAN1) terminal No.8 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between B-24 joint connector (CAN1) terminal No.19 (CAN_L) and body earth
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 30.

<Less than 1 kΩ > Go to Step 28.

STEP 28. M.U.T.-III CAN bus diagnostics (EPS-ECU connector disconnected)
(1)Disconnect EPS-ECU connector B-114, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

<M.U.T.-III indications correspond to the illustration> Prior to the wiring harness inspection, check B-27 intermediate connector, and repair if necessary. Repair the wiring harness between joint connector (CAN1) and the EPS-ECU connector.

<M.U.T.-III indications do not correspond to the illustration> Check the EPS-ECU connector, and repair if necessary. If the EPS-ECU connector is in good condition, go to Step 29.

STEP 29. M.U.T.-III CAN bus diagnostics (retest the system)
Diagnose CAN bus lines, and check if M.U.T.-III screen shows normal state.

Q. Is the check result normal?
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 EPS-ECU connector, and repair if necessary. If the EPS-ECU connector is in good condition, replace the EPS-ECU.

STEP 30. Check the CAN line between joint connector (CAN1) and the steering wheel sensor. Resistance measurement at B-24 joint connector (CAN1).
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), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between B-24 joint connector (CAN1) terminal No.5 (CAN_H) and body earth <LHD>
OK: 1 kΩ or more

(5)Resistance between B-10 joint connector (CAN1) terminal No.16 (CAN_L) and body earth <LHD>
OK: 1 kΩ or more

(6)Resistance between B-24 joint connector (CAN1) terminal No.4 (CAN_H) and body earth <RHD>
OK: 1 kΩ or more

(7)Resistance between B-10 joint connector (CAN1) terminal No.15 (CAN_L) and body earth <RHD>
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 32.

<Less than 1 kΩ > Go to Step 31.

STEP 31. M.U.T.-III CAN bus diagnostics (steering wheel sensor connector disconnected)
(1)Disconnect steering wheel sensor connector B-204, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between joint connector (CAN1) and the steering wheel sensor connector.

Check the steering wheel sensor connector, and repair if necessary. If the steering wheel sensor connector is in good condition, repair the steering wheel sensor power supply circuit.

STEP 32. Check the CAN line between joint connector (CAN1) and the G and yaw rate sensor. Resistance measurement at B-24 joint connector (CAN1).
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), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between B-24 joint connector (CAN1) terminal No.4 (CAN_H) and body earth <LHD>
OK: 1 kΩ or more

(5)Resistance between B-24 joint connector (CAN1) terminal No.15 (CAN_L) and body earth <LHD>
OK: 1 kΩ or more

(6)Resistance between B-24 joint connector (CAN1) terminal No.3 (CAN_H) and body earth <RHD>
OK: 1 kΩ or more

(7)Resistance between B-24 joint connector (CAN1) terminal No.14 (CAN_L) and body earth <RHD>
OK: 1 kΩ or more
(8)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<1 kΩ or more> Go to Step 34.

NO : <Less than 1 kΩ > Go to Step 33.

STEP 33. M.U.T.-III CAN bus diagnostics (G and yaw rate sensor connector disconnected)
(1)Disconnect G and yaw rate sensor connector C-20, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between joint connector (CAN1) and the G and yaw rate sensor connector.

Check the G and yaw rate sensor connector, and repair if necessary. If the G and yaw rate sensor connector is in good condition, repair the G and yaw rate sensor power supply circuit.

STEP 34. Check the CAN line between joint connector (CAN1) and the diagnosis connector. Resistance measurement at B-24 joint connector (CAN1)
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), and measure at the wiring harness side.
(2)Turn the electric motor switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative auxiliary battery terminal. For details refer to .
Ensure that the negative auxiliary battery terminal is disconnected.

(4)Resistance between B-24 joint connector (CAN1) terminal No.10 (CAN_H) and body earth
OK: 1 kΩ or more

(5)Resistance between B-24 joint connector (CAN1) terminal No.21 (CAN_L) and body earth
OK: 1 kΩ or more
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<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 ).

<Less than 1 kΩ > Repair the wiring harness between joint connector (CAN1) and the diagnosis connector.




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