1.CHECK DTC. 1) Turn the ignition switch to OFF. 2) Turn the ignition switch to ON. 4) Read the DTC. Read Diagnostic Trouble Code (DTC) | Is DTC U1673 displayed- (Current malfunction) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1673 LIN COMMUNICATION BUS ERROR BODY CONTROL MODULE | Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause. |
2.CHECK CONTROL MODULE. 1) Turn the ignition switch to OFF. 2) Disconnect the power rear gate CM connector. 3) Turn the ignition switch to ON. 5) Read the DTC. Read Diagnostic Trouble Code (DTC) | Is DTC U1673 displayed- (Current malfunction) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1673 LIN COMMUNICATION BUS ERROR BODY CONTROL MODULE | Replace the power rear gate CM. Power Rear Gate Control Module |
3.CHECK CONTROL MODULE. 1) Turn the ignition switch to OFF. 2) Disconnect the power seat memory CM connector. (With the power rear gate CM connector disconnected) 3) Turn the ignition switch to ON. 5) Read the DTC. Read Diagnostic Trouble Code (DTC) | Is DTC U1673 displayed- (Current malfunction) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1673 LIN COMMUNICATION BUS ERROR BODY CONTROL MODULE | Replace the power seat memory CM. Power Seat System > REMOVAL |
4.CHECK CONTROL MODULE. 1) Turn the ignition switch to OFF. 2) Disconnect the sunroof unit connector. (With the power rear gate CM connector and power seat memory CM connector disconnected) 3) Turn the ignition switch to ON. 5) Read the DTC. Read Diagnostic Trouble Code (DTC) | Is DTC U1673 displayed- (Current malfunction) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1673 LIN COMMUNICATION BUS ERROR BODY CONTROL MODULE | Replace the sunroof unit. Sunroof Motor |
5.CHECK HARNESS (OPEN CIRCUIT). 1) Turn the ignition switch to OFF. 2) Disconnect the body integrated unit connector. 3) Measure the resistance between body integrated unit connector and each unit connector. Connector & terminal (i81) No. 18 — (R422) No. 10: (i81) No. 18 — (R155) No. 12: (i81) No. 18 — (R125) No. 11: | Is the resistance less than 10 -- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1673 LIN COMMUNICATION BUS ERROR BODY CONTROL MODULE | Repair the open circuit of harness. |
6.CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY). Measure the voltage between each unit connector and chassis ground. Connector & terminal (i81) No. 18 (+) — Chassis ground (−): (R422) No. 10 (+) — Chassis ground (−): (R155) No. 12 (+) — Chassis ground (−): (i125) No. 11 (+) — Chassis ground (−): | Is the voltage less than 1 V- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1673 LIN COMMUNICATION BUS ERROR BODY CONTROL MODULE | Repair the short circuit to power supply. |
7.CHECK HARNESS (GROUND SHORT CIRCUIT). Measure the resistance between each unit connector and chassis ground. Connector & terminal (i81) No. 18 — Chassis ground: (R422) No. 10 — Chassis ground: (R155) No. 12 — Chassis ground: (i125) No. 11 — Chassis ground: | Is the resistance 1 M- or more- | Replace the body integrated unit. Body Integrated Unit | Repair the ground short circuit of harness. |
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