Refer to "54.Brake Control 4A.Troubleshooting(ABS/ESC) diagnostic System Check - Brake Controls".
1) Turn OFF the ignition switch.
2) Connect the scan tool.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool. Is DTC U0055[88] set at the same time?
Yes
Go to DTC U0055[88] diagnosis.
Refer to "54.Brake Control 4A.Troubleshooting(ABS/ESC) DTC U0055[88] Chassis CAN Bus OFF Error".
No
=>Go to SRS control unit DTC check.
1) Observe the DTC information for SRS control unit with a scan tool. Is a DTC set?
Yes
Go to the applicable DTC diagnosis.
No
=>Go to Wire harness and connector inspection.
1) Inspect the wire harnesses and connectors for the following. Is the result normal?
Wire harness to be inspected
Inspection items
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
Replace the SRS control unit.
Note
Refer to "8.Restraints 8Z.Seat Belt and SRS Airbag Electrical Control SRS control unit removal".
Refer to "8.Restraints 8Z.Seat Belt and SRS Airbag Electrical Control SRS control unit installation".
Refer to "8.Restraints 8Z.Seat Belt and SRS Airbag Electrical Control SRS control unit setting".
=>Go to Procedure completion verification.
No
Repair the circuit as necessary.
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool. Is a DTC set?
Yes
No
The system is normal.
Note
Refer to "4.Brakes 4Z.Brake Electrical Control EHCU removal".
Refer to "4.Brakes 4Z.Brake Electrical Control EHCU installation".
Refer to "4.Brakes 4Z.Brake Electrical Control EHCU setting".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool.