Test 8: Driver's Door Switch Circuit

Unlock vehicle using remote transmitter. Close all door and lock vehicle using interior central locking switch. Open driver's door using inside door handle. If all doors, fuel door and trunk unlock, driver's door switch is okay at this time. If all doors, fuel door and trunk do not unlock, check wiring. See WIRING DIAGRAMS . If wiring is okay, check the following as possible cause and repair as necessary:

• Perform pneumatic system TEST 3: FRONT DOOR SWITCH CIRCUIT (CL500, S320, S420, S500 & SL500). See PNEUMATIC SYSTEM EQUIPMENT under SYSTEM TESTS .
• Perform pneumatic system TEST 4: DRIVER'S DOOR SWITCH CIRCUIT (SLK230). See PNEUMATIC SYSTEM EQUIPMENT under SYSTEM TESTS .
• Perform central locking vacuum TEST 1: CENTRAL LOCKING SYSTEM PRESSURE CHECK. See CENTRAL LOCKING under VACUUM SYSTEM TESTS .
• Perform central locking vacuum TEST 3: INDIVIDUAL COMPONENT PRESSURE TESTS. See CENTRAL LOCKING under VACUUM SYSTEM TESTS .
• Perform pneumatic system vacuum TEST 3: CENTRAL LOCKING SYSTEM VACUUM SUPPLY (PASSENGER'S DOOR, REAR DOORS & TRUNK LID LOCK). See PNEUMATIC SYSTEM EQUIPMENT under SYSTEM TESTS .
• Perform pneumatic system vacuum TEST 4: CENTRAL LOCKING SYSTEM PRESSURE SUPPLY (PASSENGER'S DOOR, REAR DOORS & TRUNK LID LOCK). See PNEUMATIC SYSTEM EQUIPMENT under SYSTEM TESTS .
• Perform pneumatic system vacuum TEST 5: CENTRAL LOCKING SYSTEM VACUUM SUPPLY (TRUNK LID LOCK). See PNEUMATIC SYSTEM EQUIPMENT under SYSTEM TESTS .
• Perform pneumatic system vacuum TEST 6: CENTRAL LOCKING SYSTEM PRESSURE SUPPLY (TRUNK LID LOCK). See PNEUMATIC SYSTEM EQUIPMENT under SYSTEM TESTS .