[54D] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Except for Hong Kong spec.> - - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 21: Short circuit in SWS communication line | PRINT PAGE / INDEX / PRIOR / NEXT

Diagnosis code 21: Short circuit in SWS communication line
| CAUTION Whenever the ECU is replaced, ensure that the communication circuit is normal.
| COMMENTS ON TROUBLE SYMPTOM If the SWS communication line voltage is kept at low level for 0.3 second, the diagnosis code will be set. If the ETACS-ECU data line voltage is kept at high level for 0.3 second, or the ETACS-ECU has received normal signal from the other ECUs or switches, the ETACS-ECU will stop sending the diagnosis code. While this code is set, the other codes will not be set.
| POSSIBLE CAUSES Malfunction of the column switch Malfunction of the front-ECU Malfunction of the sunroof motor assembly Malfunction of the power window main switch <vehicles for Argentina> Malfunction of the ETACS-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. Connector check: A-11X front-ECU connector, C-203 column switch connector, C-228 ETACS-ECU connector, D-09 sunroof motor assembly connector, and E-05 power window main switch connector <vehicles for Argentina> Q: Is the check result normal? YES: Go to Step 2. NO: Repair the defective connector.
| Step 2. Check the wiring harness from each of A-12X front-ECU connector terminal No.30, C-310 column switch connector terminal No.3, D-09 sunroof motor assembly connector terminal No.10 and E-05 power window main switch connector terminal No.4 <vehicles for Argentina> to C-219 ETACS-ECU connector terminal No.59. NOTE: Prior to the wiring harness inspection, check joint connector C-02, intermediate connectors C-116, C-118 <vehicles for Argentina>, C-218 and E-12 <vehicles for Argentina>, and repair if necessary. Check the communication lines for open circuit. Q: Is the check result normal? YES: Go to Step 3. NO: Repair the wiring harness.
| Step 3. Check the wiring harness between C-310 column switch connector terminal No.2 and C-219 ETACS-ECU connector terminal No.68. Check the communication lines for open circuit. Q: Is the check result normal? YES: Go to Step 4. NO: Repair the wiring harness.
| Step 4. Check whether the diagnosis code is reset. When A-11X front-ECU connector is disconnected, check that diagnosis code No.21 is not reset. However, diagnosis code No.13 will be set at this time. Q: Is diagnosis code No.21 set? YES: Replace the front-ECU. NO: Go to Step 5.
| Step 5. Check whether the diagnosis code is reset. When D-25 sunroof motor assembly connector is disconnected, check that diagnosis code No.21 is not reset. Q: Is diagnosis code No.21 set? YES (no DTCs are set): Replace the sunroof motor assembly. NO (except for Argentina): Go to Step 7. NO (vehicles for Argentina): Go to Step 6.
| Step 6. Check whether the diagnosis code is reset. When E-05 power window main switch connector is disconnected, check that diagnosis code No.21 is not reset. Q: Is diagnosis code No.21 set? YES: Replace the power window main switch. NO: Go to Step 7.
| Step 7. Check that the hazard warning lamps illuminate. When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning lamps illuminate. Q: Is the check result normal? YES: Refer to diagnosis code No.12 "Column switch fault or improper connection ." NO: Refer to Inspection Procedure A-2 "Check the ETACS-ECU battery power supply circuit ."

[54D] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Except for Hong Kong spec.> - - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 21: Short circuit in SWS communication line | PRINT PAGE / INDEX / PRIOR / NEXT

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