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INPUT SIGNAL PROCEDURES TSB Revision SWS INPUT SIGNAL PROCEDURES 54Bc-11 CIRCUIT OPERATION . TECHNICAL DESCRIPTION (COMMENT) . TROUBLESHOOTING HINTS • The fog light switch may be defective • The ETACS-ECU may be defective • The wiring harness or connectors may have loose, corroded, or damaged terminals, or termi- DIAGNOSIS Required Special Tools: • MB991223: Harness Set • MB991502: Scan Tool (MUT-II) STEP 1. Check the fog light switch. Q: Is the fog light switch in good condition? YES : Go to Step 2. operates normally, it indicates that a correct signal is STEP 2. Check the ground circuit to the fog light switch. the resistance available at the wiring harness side of the (2) Measure the resistance value between terminal 2 and ground. • The resistance should equal 2 ohms or less. Q: Is the measured resistance 2 ohms or less? YES : Go to Step 5. SWITCH TESTER SPECIFIED Released 1 − 2 Open circuit Pressed 1 − 2 Less than 2 ohms ACX00797 AC204170 CONNECTOR : D-127 HARNESS SIDE AP 1 2 3 4 D-127 4 3 2 1 5 6 ACX01597AB CONNECTOR D-127 |