[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - FOG LAMP - INSPECTION PROCEDURE M-2: The rear fog lamps do not illuminate normally.PRINT PAGE / INDEX / PRIOR / NEXT
INSPECTION PROCEDURE M-2: The rear fog lamps do not illuminate normally.
 CAUTION
 Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
OPERATION
The ETACS-ECU operates this function in accordance with the input signals below.
  • Tail lamp switch
  • Headlamp switch
  • Fog lamp switch
If the rear fog lamps do not illuminate normally, these input signal circuit(s) or the ETACS-ECU may be defective.
POSSIBLE CAUSES
  • Malfunction of the column switch
  • Malfunction of the fog lamp switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Check that the tail lamps and headlamps operate.
Check that the tail lamps and headlamps illuminate normally.
Q: Is the check result normal?
YES:  Go to Step 2.
NO:  Check the tail lamps and the headlamps (Refer to trouble symptom chart ).
Step 2. Pulse check
Check the input signals below, which are related to the rear fog lamps.
System switch
 Check condition
Ignition switch (IG1)
 When turned from ACC to ON
Rear fog lamp switch
 When the fog lamp switch is turned from off to on

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.
Q: Are the check result normal?
All the signals are received normally.:  Go to Step 3.
The ignition switch (IG1) signal is not received.:  Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received ."
The rear fog lamp switch signal is not received.:  Refer to inspection procedure P-19 "The rear fog lamp switch signal is not received ."
Step 3. Connector check: C-35 rear fog lamp-ECU connector
Q: Is the check result normal?
YES:  Go to Step 4.
NO:  Repair the defective connector.
Step 4. Check the rear fog lamp-ECU.
Refer to GROUP 54A - Rear fog lamp .
Q: Is the check result normal?
YES:  Go to Step 5.
NO:  Replace the rear fog lamp-ECU.
Step 5. Voltage measurement at the C-35 rear fog lamp-ECU connector.
  1. Remove the rear fog lamp-ECU, and measure at the harness side.
  1. Check the voltage between the rear fog lamp-ECU connector and body earth.
    • Voltage between C-35 rear fog lamp-ECU connector terminal No.4 and body earth
    OK: System 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-35 rear fog lamp-ECU connector terminal No4 and the fusible link (1).
NOTE: Prior to the wiring harness inspection, check intermediate connectors A-14, C-125 and junction block connector C-204, 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 7. Measure the resistance at the C-35 rear fog lamp-ECU connector.
  1. Remove the rear fog lamp-ECU, and measure at the wiring harness.
  1. Continuity between C-35 rear fog lamp-ECU connector terminal No.8 and body earth
    2. OK: 2Ω or less
Q: Is the check result normal?
YES:  Go to Step 9.
NO:  Go to Step 8.
Step 8. Check the wiring harness between C-35 rear for lamp-ECU connector terminal No.8 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 9. Connector check: C-219 ETACS-ECU connector
Q: Is the check result normal?
YES:  Go to Step 10.
NO:  Repair the defective connector.
Step 10. Check the wiring harness between C-35 rear fog lamp-ECU connector terminal No7 and C-219 ETACS-ECU connector terminal No.59.
NOTE: Prior to the wiring harness inspection, check joint connector C-02, and repair if necessary.
  • Check the output lines for open circuit.
Q: Is the check result normal?
YES:  Go to Step 11.
NO:  Repair the wiring harness.
Step 11. Retest the system.
Check that the rear fog lamps illuminate normally.
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.
[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - FOG LAMP - INSPECTION PROCEDURE M-2: The rear fog lamps do not illuminate normally.PRINT PAGE / INDEX / PRIOR / NEXT
©2004 Mitsubishi Motors Corporation