Eclipse L4-2.4L SOHC (2004)
Q: Does the scan tool display "IG SW (IG1)" as normal condition?
YES: Go to Step 3.
NO: Refer to Inspection Procedure O-2 "ETACS-ECU does not receive a signal from the ignition switch (IG1)."
STEP 3. Check the input signal (by using the Pulse check mode of the monitor).
Check input signal from the driver's side seat belt switch.
1. Operate scan tool MB991958 according to the procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."
2. When the driver's seat belt is fastened, check if scan tool MB991958 sounds or not.
Q: Does scan tool MB991958 sound when the driver's side seat belt is fastened?
YES: Replace the ETACS-ECU. Check that the seat belt tone alarm function works normally.
NO: Refer to Inspection Procedure P-3 "ETACS-ECU does not receive a signal from the driver's side seat belt switch."
Vehicles With Keyless Entry System
Tone Alarm: Seat Belt Tone Alarm Function does not Work Normally. <Vehicles with Keyless Entry System>
NOTE: This troubleshooting requires use of scan tool MB991958 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer
to "How to use SWS monitor See: Reading and Clearing Diagnostic Trouble Codes/How To Use SWS Monitor."
