[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - INPUT SIGNAL PROCEDURES - Inspection procedure P-20: The hood switch signal is not received.PRINT PAGE / INDEX / PRIOR / NEXT
Inspection procedure P-20: The hood switch signal is not received.
 CAUTION
 Whenever the ECU is replaced, ensure that the input signal circuit is normal.
COMMENTS ON TROUBLE SYMPTOM
Input signal from the hood switch is used to operate the security alarm. If the signal is abnormal, the security alarm will not illuminate.
POSSIBLE CAUSES
  • Malfunction of the hood switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Connector check: A-33 hood switch connector
Q: Is the check result normal?
YES:  Go to Step 2.
NO:  Repair the defective connector.
Step 2. Check the hood switch.
Refer to GROUP 42 - Hood .
Q: Is the check result normal?
YES:  Go to Step 3.
NO:  Replace the hood switch.
Step 3. Measure the resistance at the A-33 hood switch connector.
  1. Disconnect the connector, and measure at the wiring harness side.
  1. Continuity between A-33 hood switch connector terminal No.2 and body earth
    2. OK: 2Ω or less
Q: Is the check result normal?
YES:  Go to Step 5.
NO:  Go to Step 4.
Step 4. Check the wiring harness between A-33 hood switch connector terminal No.2 and 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 5. Connector check: C-220 ETACS-ECU connector
Q: Is the check result normal?
YES:  Go to Step 6.
NO:  Repair the defective connector.
Step 6. Check the wiring harness between C-220 ETACS-ECU connector terminal No.21 and A-33 hood switch connector terminal No.1.
NOTE: Prior to the wiring harness inspection, check intermediate connector C-116, and repair if necessary.
  • Check the input line for open circuit.
Q: Is the check result normal?
YES:  Go to Step 7.
NO:  Repair the wiring harness.
Step 7. Check the ETACS SW data by using the SWS monitor.
  • Hood switch: ON
Item No.
 Item name
 Normal conditions
Item 13
 HOOD SW
 ON

OK: Normal condition is displayed.
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:  Replace the ETACS-ECU.
[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - INPUT SIGNAL PROCEDURES - Inspection procedure P-20: The hood switch signal is not received.PRINT PAGE / INDEX / PRIOR / NEXT
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