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Test 2: Stoplight Circuit

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 1999 Mercedes-Benz E55, 1999 Mercedes-Benz E430, 1999 Mercedes-Benz E320, 1999 Mercedes-Benz E300, and 1999 Mercedes-Benz CLK430. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect Pneumatic System Equipment (PSE) control module harness connectors. Connect harness adapter and breakout box to Pneumatic System Equipment (PSE) control module and harness connectors. Measure voltage between terminal No. 12 on breakout box and terminal No. 3 at PSE control module harness connector No. 2. Turn ignition on. When brake pedal is released, less than one volt should exist. When brake pedal is depressed, battery voltage should exist. If voltage is as specified, replace PSE control module. If voltage is not as specified, check wiring. See WIRING DIAGRAMS . If wiring is okay, replace stoplight switch.

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