Information CAN communication circuit inspection (Central GateWay)

1. Body control system check

Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) diagnostic system check - central gateway controls".

2. Scan tool communication verification

1) Connect the scan tool.

2) Turn ON the ignition switch.

3) Check the vehicle specifications and verify the status of communication with the following control modules using a scan tool. Can communication with any of the control modules be established?

Yes

eCall unit communication verification

No

=>Go to eCall unit inspection.

3. eCall unit communication verification

1) Verify that communication can be established with the eCall unit using the scan tool. Can communication with the eCall unit be established?

Yes

Audio center unit communication verification

No

Go to Lost communication with the eCall unit.

Refer to "64.Body Control 10I.Troubleshooting(eCall unit) lost communication with the eCall unit".

4. Audio center unit communication verification

1) Connect the scan tool.

2) Turn ON the ignition switch.

3) Check the communication status with the audio center unit using a scan tool. Can communication with the audio center unit be established?

Yes

The system is normal.

No

=>Go to Audio center unit power supply and ground circuit inspection.

5. Audio center unit power supply and ground circuit inspection

1) Inspect the power supply circuit and ground circuit of the audio center unit for the following. Is the result normal?

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to Inspection for open circuit and short circuit in Information CAN communication circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

6. Inspection for open circuit and short circuit in Information CAN communication circuit

1) Inspect for an intermittent short together between the CAN Low and CAN High circuits, and an intermittent short to ground or intermittent short to the power supply circuit. Is the result normal?

2) Inspect for intermittent open circuits in the CAN Low circuit and CAN High circuit in the control unit with which communication cannot be established. Is the result normal?

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Are all of the results normal?

Yes

=>Go to Repair verification.

No

Repair the circuit as necessary.

=>Go to Repair verification.

7. eCall unit inspection

1) Turn OFF the ignition switch.

2) Disconnect the eCall unit harness connector (B85).

Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Verify that communication can be established with control units other than the eCall unit using the scan tool. Can communication with control units other than the eCall unit be established?

Yes

=>Go to eCall unit replacement.

No

=>Go to Audio center unit inspection.

8. Audio center unit inspection

1) Turn OFF the ignition switch.

2) Disconnect the audio center unit harness connector (B49).

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Verify that communication can be established with control units other than the audio center unit using the scan tool. Can communication with control units other than the audio center unit be established?

Yes

=>Go to Audio center unit replacement.

No

=>Go to Information CAN communication circuit resistance check.

9. Information CAN communication circuit resistance check

1) Disconnect the audio center unit harness connector (B49).

2) Measure the resistance at the CAN resister (pins 13 and 16 of B3) from the backside of the Fuse and Relay Box (Instrument Panel) harness connector with a DMM. Is the resistance within the specified range?

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Value: 50 to 70 Ω

Yes

=>Go to Audio center unit replacement.

No

=>Go to CAN resistor inspection.

10. CAN resistor inspection

1) Disconnect the central gateway control unit harness connector (B41).

2) Measure the resistance at the CAN resister (pins 13 and 16 of B3) from the backside of the Fuse and Relay Box (Instrument Panel) harness connector with a DMM. Is the resistance within the specified range?

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Value: 110 to 130 Ω

Yes

=>Go to Central gateway control unit replacement.

No

Replace the CAN resistor.

=>Go to Repair verification.

11. eCall unit replacement

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control eCall unit removal".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control eCall unit installation".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control eCall unit setting".

Procedure completion

=>Go to Repair verification.

12. Audio center unit replacement

Refer to "9.Body, Cab, Accessories 9C.Electrical Control, Entertainment audio and navigation system removal".

Refer to "9.Body, Cab, Accessories 9C.Electrical Control, Entertainment audio and navigation system installation".

Refer to "9.Body, Cab, Accessories 9C.Electrical Control, Entertainment audio and navigation system setting".

Procedure completion

=>Go to Repair verification.

13. Central gateway control unit replacement

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control central gateway control unit removal".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control central gateway control unit installation".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control central gateway control unit setting".

Procedure completion

=>Go to Repair verification.

14. Repair verification

1) Check the vehicle specifications and verify the status of communication with the following control modules using a scan tool. Can communication with any of the control modules be established?

Yes

The system is normal.

No

=>Go to Scan tool communication verification.