1996-2004 Mercedes R170 Service & Repair Manual

2001-04 STARTING & CHARGING SYSTEMS Starters - 170.465 & 170.466 Chassis MODEL IDENTIFICATION MODEL IDENTIFICATION DESCRIPTION Starter is a brush-type, series-wound electric motor with an overrunning clutch. Field frame contains field coils and is enclosed by commutator/drive bushing end frame, which carries pole shoes. A splined armature shaft carries drive assembly. TROUBLE SHOOTING BASIC TROUBLESHOOTING If starter is noisy, the cause could be bent or damaged gear tooth chamfers on ring gear. This cannot be seen with starter installed in vehicle. Activate starter without switching ignition on. Metallic noise should not be heard. If noise is heard, replace ring gear. PRELIMINARY INSPECTION Verify customer complaint by operating system. Visually inspect for obvious signs of mechanical and electrical damage. Check generator belt tension and condition. Ensure that battery voltage is within specifications. Inspect for blown fuses and damaged relays. For fuse and/or relay identification, see WIRING DIAGRAMS . WARNING: Vehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS (or AIR BAG SAFETY PRECAUTIONS) and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article. NOTE: When the battery is disconnected, vehicle computer and memory system may lose data. Driveability problems may exist until computer systems have completed a relearn cycle. Radio will not operate until coded. Obtain code card from customer. NOTE: The following table identifies models applicable to this article. Model Chassis Engine Number SLK320 (2001-04) 170.465 112.947 SLK32 AMG (2002-04) 170.466 112.960 2003 Mercedes-Benz SLK320 2001-04 STARTING & CHARGING SYSTEMS Starters - 170.465 & 170.466 Chassis 2003 Mercedes-Benz SLK320 2001-04 STARTING & CHARGING SYSTEMS Starters - 170.465 & 170.466 Chassis

Verify ground connection integrity between engine, body, battery and generator. Check for damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If no fault is found, check for conditions that might cause an intermittent situation. SERVICE PRECAUTIONS BATTERY DISCONNECT/CONNECT Disconnect/Connect Procedures 1. Turn off ignition. Open engine hood. After opening vehicle wait at least 4 minutes before disconnecting battery or alarm will be triggered. 2. Connect quiescent current retention unit, if necessary. 3. Disconnect negative battery cable (1) and insulate cable lug to prevent unwanted contact with ground point (W16/4). See Fig. 1 . 4. To connect, reverse disconnect procedure. Tighten nut (5) to specification. See TORQUE SPECIFICATIONS . 5. If quiescent current retention unit was not used, perform basic programming. Read diagnostic trouble code memory and erase trouble codes from memory. See BASIC PROGRAMMING and RETRIEVING & ERASING DIAGNOSTIC TROUBLE CODES . NOTE: Numbers and letters in text refer to numbers and letters in figures. 2003 Mercedes-Benz SLK320 2001-04 STARTING & CHARGING SYSTEMS Starters - 170.465 & 170.466 Chassis

Fig. 1: Disconnecting Negative Battery Cable Courtesy of MERCEDES-BENZ OF NORTH AMERICA. BASIC PROGRAMMING 1. Code radio. See CODING RADIO . 2. Set time on instrument cluster. Pull out knob at lower right of speedometer. To adjust hour, turn to right. To adjust minute, turn to left. 3. If necessary, set time at stationary heater timer. 4. Start engine and run at idle. Turn steering wheel from one lock position to the other to activate steering angle sensor. Center steering wheel. Malfunction indicator lamp should go out. 5. If equipped, normalize tilting/sliding roof. Open sunroof and hold down switch. Sunroof moves to end position and pulls back 1/4 turn and stops. If equipped with lemella sliding roof, close roof and keep switch pressed for 5 to 10 seconds. 6. Normalize power windows. Completely close each window with manual switch. Hold switch in closed position for 5 seconds. Coding Radio 2003 Mercedes-Benz SLK320 2001-04 STARTING & CHARGING SYSTEMS Starters - 170.465 & 170.466 Chassis

1. Turn ignition on. CODE will appear on radio display. Enter first code number with station button. For example, station button 1 is number 1. 2. After entering first number, CODE will disappear and first number entered will appear followed by 4 dashes. The next character to be entered flashes. 3. After entering all 5 numbers the first character starts flashing again. If an input error has occurred it can be corrected at this time by reentering the complete correct code. 4. Press TUNE, AUTO/SEEK or SC button. If code is correct, radio automatically switches on and indicates the station or frequency stored with station button 1. If an incorrect code number has been entered, CODE appears again on display. If an incorrect code is entered 3 times, WAIT appears on display and radio locks up for approximately 10 minutes. If an incorrect code is entered 3 times again, radio locks up for approximately 10 additional minutes. After 9 incorrect attempts, lock time increases to 60 minutes. Another 3 incorrect entries locks up radio for another 60 minutes. Radio must remain switched on during lock up time. RETRIEVING & ERASING DIAGNOSTIC TROUBLE CODES RETRIEVING DIAGNOSTIC TROUBLE CODES To retrieve codes using hand held tester, see Fig. 2 . NOTE: Before replacing any component that scan tool suggests are faulty, ensure that all wiring connections and harness connectors are okay. Ensure that power and ground circuits are functioning properly. For circuit identification, see appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS for vehicle being tested. NOTE: For diagnostic equipment connections, see FAULT CODE DIAGNOSIS EQUIPMENT CONNECTION . 2003 Mercedes-Benz SLK320 2001-04 STARTING & CHARGING SYSTEMS Starters - 170.465 & 170.466 Chassis

Fig. 2: Retrieving Codes Using Hand Held Tester Courtesy of MERCEDES-BENZ OF NORTH AMERICA. CLEARING DIAGNOSTIC TROUBLE CODES Disconnecting vehicle battery will not erase codes. Follow scan tool equipment manufacturers instructions to erase fault codes. FAULT CODE DIAGNOSIS EQUIPMENT CONNECTION To connect hand held tester scan tool to Mercedes-Benz data link connector, see Fig. 3 . To connect hand held tester scan tool to OBD-II data link connector, see Fig. 4 . 2003 Mercedes-Benz SLK320 2001-04 STARTING & CHARGING SYSTEMS Starters - 170.465 & 170.466 Chassis

1996-2004 Mercedes R170 Service & Repair Manual

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