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SWS DIAGNOSIS TSB Revision SIMPLIFIED WIRING SYSTEM (SWS) 54B-67 DIAGNOSIS Required Special Tools: • MB991502: Scan Tool (MUT-II) • MB991529: Diagnostic Trouble Code Check Harness STEP 1. Check method of the input signal Q: Which is to be used, the scan tool or the voltmeter to check the input signal? STEP 2. Check the input signal (by using scan tool • Ignition switch (IG1) • Driver's and front passenger's door switch CAUTION To prevent damage to scan tool MB991502, always turn the when the input signal enters. Q: Does the tone alarm of scan tool MB991502 sound when the input signal enters? STEP 3. Check the input signal (by using a voltmeter). • Ignition switch (IG1) • Driver's and front passenger's door switch (1)Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the (2)Check that the voltmeter indicator deflects once when the input signal enters. Q: Does the voltmeter indicator deflect? YES : Go to Step 4. AC003081 AB 16 PIN MB991502 AC003083 16 PIN AB ETACS-ECU GROUNDED TERMINAL MB991529 |