[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Hong Kong spec.> - - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 12: Trouble related to the column switch or improper communication with the ETACS-ECUPRINT PAGE / INDEX / PRIOR / NEXT
Diagnosis code 12: Trouble related to the column switch or improper communication with the ETACS-ECU
 CAUTION
 Whenever the ECU is replaced, ensure that the power supply circuit, the grounding circuit and the communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
If the column switch ignores the data request signal sent by the ETACS-ECU (three times or more for one second), this diagnosis code will be set. Then, when the column switch observes the request signal for one second, the ECU will stop sending the diagnosis code.
POSSIBLE CAUSES
  • Malfunction of the column switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Use the MUT-II/III to confirm a diagnosis code.
  1. Ignition switch: ON
  1. On completion, check that diagnosis code No.12 is not reset.
Q: Is diagnosis code No.12 set?
YES:  Go to Step 5.
NO:  Go to Step 2.
Step 2. Connector check: C-310 column switch connector
Q: Is the check result normal?
YES:  Go to Step 3.
NO:  Repair the connector.
Step 3. Measure the voltage at C-310 column switch connector.
  1. Disconnect the connector, and measure at the wiring harness side.
  1. Voltage between C-310 column switch connector terminal No.1 and body earth
    2. OK: Battery positive voltage
Q: Is the check result normal?
YES:  Replace the column switch.
NO:  Go to Step 4.
Step 4. Check the wiring harness between C-310 column switch connector terminal No.1 and the fusible link (1).
NOTE: Prior to the wiring harness inspection, check junction block connectors C-202, C-204 and intermediate connectors A-14, C-125, and repair if necessary.
  • Check the power supply line for open circuit.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 5. Measure the resistance at the C-310 column switch connector.
  1. Disconnect the connector, and measure at the wiring harness side.
  1. Resistance between C-310 column switch connector terminal No.4 and body earth
    2. OK: Continuity exists.
Q: Is the check result normal?
YES:  Go to Step 7.
NO:  Go to Step 6.
Step 6. Check the wiring harness between C-310 column switch connector terminal No.4 and the body earth.
  • Check the earth wires for open circuit.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 7. Connector check: C-219 ETACS-ECU connector
Q: Is the check result normal?
YES:  Go to Step 8.
NO:  Repair the connector.
Step 8. Check the wiring harness from C-219 ETACS-ECU connector terminal Nos. 59 and 68 to C-310 column switch connector terminal Nos. 3 and 2.
NOTE: Prior to the wiring harness inspection, check joint connector C-02, and repair if necessary.
  • Check the communication lines for open circuit.
Q: Is the check result normal?
YES:  Go to Step 9.
NO:  Repair the wiring harness.
Step 9. Check whether the diagnosis code is reset.
Replace the column switch, and then check that the diagnosis code is not reset.
  1. Replace the column switch.
  1. Ignition switch: ON
  1. On completion, check that diagnosis code No.12 is not reset.
Q: Is diagnosis code No.12 set?
YES:  Replace the ETACS-ECU.
NO:  The procedure is complete.
[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Hong Kong spec.> - - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 12: Trouble related to the column switch or improper communication with the ETACS-ECUPRINT PAGE / INDEX / PRIOR / NEXT
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