[54E] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Except for Hong Kong spec.> - - INPUT SIGNAL PROCEDURES - INSPECTION PROCEDURE P-18: The interior lamp loaded signal is not detected.PRINT PAGE / INDEX / PRIOR / NEXT
INSPECTION PROCEDURE P-18: The interior lamp loaded signal is not detected.
 CAUTION
 Whenever the ECU is replaced, ensure that the input signal circuit is normal.
COMMENTS ON TROUBLE SYMPTOM
The interior lamp automatic shutdown function operates in accordance with the interior lamp loaded signal. If this signal is abnormal, the functions below will not work normally.
  • Ignition key cylinder illumination lamp
  • Room lamps
  • Interior lamp automatic shutdown function
POSSIBLE CAUSES
  • Malfunction of the ETACS-ECU
  • Damaged wiring harness or connector(s)
DIAGNOSIS PROCEDURE
Step 1. ECU check by using the SWS monitor
Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.
  • Ignition switch: OFF
ECUS TO BE CHECKED
  • ETACS ECU
OK: "OK" is displayed on the "ETACS ECU" menu.
Q: Is the check result normal?
YES:  Go to Step 2.
NO:  Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible ."
Step 2. Connector check: C-217 ETACS-ECU connector
Q: Is the check result normal?
YES:  Go to Step 3.
NO:  Repair the defective connector.
Step 3. Measure the voltage at the C-217 ETACS-ECU connector.
  1. Remove the ETACS-ECU, and measure at the junction block side.
  1. Ignition switch: ON
  1. Voltage between C-217 ETACS-ECU connector terminal No.8 and body earth
    2. OK: Battery positive voltage
Q: Is the check result normal?
YES:  Go to Step 5.
NO:  Go to Step 4.
Step 4. Check the wiring harness between C-217 ETACS-ECU connector terminal No.8 and the ignition switch (IG1).
NOTE: Prior to the wiring harness inspection, check junction block connector C-203, and repair if necessary.
  • Check the power supply line to the ignition switch (IG1) 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 voltage at the C-217 ETACS-ECU connector.
  1. Remove the ETACS-ECU, and measure at the junction block side.
  1. Ignition switch: ACC
  1. Voltage between terminal 4 and body earth
    2. OK: Battery positive voltage
Q: Is the check result normal?
YES:  Go to Step 7.
NO:  Go to Step 6.
Step 6. Check the wiring harness between C-217 ETACS-ECU connector terminal No.4 and the ignition switch (ACC).
NOTE: Prior to the wiring harness inspection, check junction block connector C-202 <LH drive vehicles>, C-203 <RH drive vehicles> or intermediate connector C-116 <LH drive vehicles>, and repair if necessary.
  • Check the power supply line to the ignition switch (ACC) 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. Pulse check
Check the input of the interior lamp loaded signal.
System switch
 Check condition
Interior lamp loaded signal
 When a load is applied through multi-purpose fuse No.22

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.
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.
[54E] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Except for Hong Kong spec.> - - INPUT SIGNAL PROCEDURES - INSPECTION PROCEDURE P-18: The interior lamp loaded signal is not detected.PRINT PAGE / INDEX / PRIOR / NEXT
©2004 Mitsubishi Motors Corporation