[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <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 power window main switch Malfunction of the sunroof assembly Malfunction of the ETACS-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. Connector check: A-12X front-ECU connector, C-310 column switch connector, C-219 ETACS-ECU connector, E-05 power window main switch connector, and D-09 sunroof motor assembly connector Q: Is the check result normal? YES: Go to Step 2. NO: Repair the 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, E-05 power window main switch connector terminal No.4 and D-09 sunroof motor assembly connector terminal No.10 to C-219 ETACS-ECU connector terminal No.59. NOTE: Prior to the wiring harness inspection, check joint connector C-02, intermediate connectors C-30, C-116, C-218 and E-29 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: Go to Step 5. NO: Replace the front-ECU.
| Step 5. 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: Go to Step 6. NO: Replace the power window main switch.
| Step 6. Check whether the diagnosis code is reset. When D-09 sunroof motor assembly connector is disconnected, check that diagnosis code No.21 is not reset. Q: Is diagnosis code No.21 set? YES: Go to Step 7. NO: Replace the sunroof motor assembly.
| 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 "Trouble related to the Column switch or improper connection with the ETACS-ECU ." NO: Refer to inspection procedure A-2 "Check the battery power supply circuit to the ETACS-ECU ."

[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <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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