1. Body control system check
Refer to "64.Body Control 10I.Troubleshooting(BCM) diagnostic system check-body controls".
2. BCM DTC check
1) Observe whether a DTC is set in the BCM on the scan tool. Is a DTC set in the BCM?
Yes
=>Go to ECM communication verification.
No
Go to Intermittent conditions of body control system.
Refer to "223.Body Control 36D.Symptom(BCM) intermittent conditions of body control system".
3. ECM communication verification
1) Use the scan tool to communicate with the ECM to display the data. Can communication with the ECM be established?
Yes
=>Go to ECM DTC check.
No (Models with radar sensors/stereo cameras)
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) lost communication with the ECM (models with radar sensor/ stereo camera)".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) lost communication with the ECM (models with radar sensor/ stereo camera)".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) lost communication with the ECM (models with radar sensor/ stereo camera)".
No (Models without radar sensors and stereo cameras)
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) lost communication with the ECM (models without radar sensor and stereo camera)".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) lost communication with the ECM (models without radar sensor and stereo camera)".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) lost communication with the ECM (models without radar sensor and stereo camera)".
4. ECM DTC check
1) Observe whether a DTC is set in the ECM on the scan tool. Is a DTC set in the ECM?
Yes
Go to the applicable DTC diagnosis.
No (Models with radar sensors/stereo cameras)
=>Go to Powertrain CAN communication circuit inspection and Body CAN communication circuit inspection.
No (Models without radar sensors and stereo cameras)
=>Go to CAN communication system inspection.
5. Powertrain CAN communication circuit inspection and Body CAN communication circuit inspection
1) Perform Powertrain CAN communication circuit inspection and Body CAN communication circuit inspection.
Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) powertrain CAN communication circuit inspection".
Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) body CAN communication circuit inspection".
Procedure completion
=>Go to Current DTC check.
6. CAN communication system inspection
1) Inspect the CAN communication system.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) scan tool does not communicate with CAN device (models without radar sensor and stereo camera)".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) scan tool does not communicate with CAN device (models without radar sensor and stereo camera)".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) scan tool does not communicate with CAN device (models without radar sensor and stereo camera)".
Procedure completion
=>Go to Current DTC check.
7. Current DTC check
1) Connect the 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
=>Go to BCM replacement.
No
=>Go to Repair verification.
8. BCM replacement
Note
- Perform programming after replacing the BCM.
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM removal".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM installation".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM setting".
Procedure completion
=>Go to Repair verification.
9. Repair verification
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool.