Test 11: Infrared Lock Signal To Driver Door Control Module
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1999 Mercedes-Benz E430, 1999 Mercedes-Benz E320, 1999 Mercedes-Benz E300, 1999 Mercedes-Benz CLK430, and 1999 Mercedes-Benz CLK320. However, it is still accessible from the selected car via links, so may be relevant.
Connect Hand-Held Tester (HHT) to Data Link Connector (DLC) located in engine bay. Monitor door control module readings. Point transmitter key at driver's door handle and lock vehicle. If a checkmark is displayed on HHT, system is okay. If "F" is displayed on HHT, perform TEST 2: LEFT FRONT DOOR INFRARED (IR) RECEIVER VOLTAGE SUPPLY under SYSTEM TESTS. Check transmitter batteries. Transmitter may be defective.